What is Hcl: Definition and 145 Discussions

The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. At room temperature, it is a colourless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor. Hydrogen chloride gas and hydrochloric acid are important in technology and industry. Hydrochloric acid, the aqueous solution of hydrogen chloride, is also commonly given the formula HCl.

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  1. jaumzaum

    Why HCl is a much stronger acid than H2O?

    I want to know why HCl is a much stronger acid than H2O.They have similar bond energies (H-Cl = 427 kJ/mol, O-H = 467 kJ/mol), so there should be easy to ionize both. Besides, O is more electronegative than Cl, so it should "steal" the electron easier. Why is HCl Ka so superior than water Kw?
  2. S

    Testing Liquidified HCl: Corrosive Effects & Litmus Paper Results

    I had read that water is essential for any acid. When HCl is dissolved in water, it produces H+ ions which cause the litmus paper to change it colour! But if HCl gas is liquidified and then tested with liquid, what would be the results? As wel as this pure liquid HCl is corrosive or not?
  3. mishima

    Dissolving iron in HCl, unknown product

    My class needed some iron (iii) chloride to determine the purity of some aspirin they synthesized, so I thought I might try making some. I left a strip of iron in concentrated HCl for a few nights under the fume hood. I was expecting a liquid with iron (ii) chloride to result, which would then...
  4. M

    Orbital Overlap in HCl: Explained!

    Help I am really confused! Orbital overlap in Hcl. Hi, The orbital overlap in HCl is due to hybridization between one sp³ oribital from Cl and one s orbital from H. So why does the following picture say that the orbital overlap is between one p orbital from Cl and one s orbital from H...
  5. morrobay

    Why is solubility of HBr Less Than HCl ?

    The maximum concentration of dissolved HBr , 8.9 moles/L is less than HCl 12 moles/L The values from table below from various sources suggest that HBr should be more soluble at STP in 1 liter water ? .........HBr.......HCl enthalpy of formation....-53kJ.mole >>>>>>>>>>>>>>>-96kJ/mole...
  6. morrobay

    Is a .1M HCl solution more acidic than a .2M HCL solution ?

    With .1M HCl the pH = -Lg 10-1 = 1 With .2M HCL the pH = 2 Since both solutions are low concentrations of a strong acid they are fully ionized and the Ka HCL = [H+] [A-]/[HA] is not relevant. But the .2M HCl solution has higher concentration of H3O+ But by definition the .1 M HCL...
  7. S

    Need help determining the molar enthelpy of Magnesium with HCl

    Picture to show more clearly: http://i.imgur.com/JmARtQM.png 1. Homework Statement What is the molar enthalpy of combustion ΔH(c) of magnesium? Mg(s) + 2HC(aq) → H2(g) + MgCl2(aq) MgO(s) + 2HCl(aq) → H2O(l) + MgCl2(aq) m(Mg) = 0.5 g m(MgO) = 1.0 g V(HCl) = 100.0 mL C(HCl) = 1.0 mol/L...
  8. W

    Enthelpy of neutralization of HCl and NaOH

    There is the experiment of Enthalpy of neutralization of strong HCl and strong base NaOH Homework Statement Chemicals: 0.2 M HCl and 0.2 M NaOH Polythene bottle. Water equivalent of polythene bottle e=900 t1=29.7 c temp of mixture= 32 c Rise in temperature = 2.3 c The attempt at a...
  9. F

    Can HCL Dissolve in Cooking Oil? | Chemistry Info

    I recently gave my hand tools a bath in " right from the bottle" strength HCL. I had previously known about the naughty flash rusting that occurs, so to combat the rust, I quickly plunged the tool in water, gave it a quick wipe and then plunged it into extremely hot cooking oil. The tools...
  10. C

    Sollubility of BaSO4 in 4M HCL help

    Hi can anyone help me out with this problem? This is how far I came BaSO4 +H(+) <---> SO4+H2O +Ba s 4-s s s ksp = [SO4][Ba]/[H+] = s^2/[4-s] So I saturated the solution in s, so the H+ will be 4M-s at equilibrium, But it's not correct :(...
  11. X

    Chemistry Calculating the Concentration of N/5 HCl After Removal of 3.65g

    Homework Statement On boiling 1litre of N/5 HCl, the volume of the aqueous solution decreases to 250ml. If 3.65g of HCl is removed from solution, then the concentration of resulting solution becomes? N/5 N/2.5 N/20 N/10 Homework Equations HCl=36.5g/ mol The Attempt at a Solution...
  12. mishima

    Sticky substance on HCl bottle

    I found an old bottle of 12 M HCl that has a sticky residue on the outside of the bottle. It had a discoloring effect on blue fabric. How can I safely remove this?
  13. HelloCthulhu

    Saltwater Electrolysis - Adding HCl

    Greetings forum! I'm experimenting with saltwater electrolysis and have a few questions. I'm using a salt solution I've prepared overnight. The solution has about 2 parts water, 6 parts salt, so I will essentially be electrolyzing brine at the beginning of the experiment (For safety, the...
  14. T

    Understanding HCl + Ca(OH)2 Reaction: pH?

    Homework Statement I'm trying to understand what happens, chronologically, when 2mol HCl is mixed with 1mol Ca(OH)2 in aqueous solution. Also, is the resulting solution acidic or alkaline. Homework Equations 2HCl + Ca(OH)_2 = 2H^+ + 2Cl^- + Ca^{2+} + 2(OH)^- = ? The Attempt at a...
  15. S

    How to find the pH of HCl and NaOH combined.

    Homework Statement I have .100mL of .100M HCl titrated with .100M NaOH, Theres a chart I have to fill in and I'm completely lost. I have the volume of NaOH(from 0ml-200ml) I have to find the total volume of the solution, I get that, moles remaining of solution molarity of remaining solution...
  16. fluidistic

    HCl molecule, rotational and vibrational energy question

    Since the HCl molecule has a non vanishing dipole moment, it is allowed to have pure rotational spectrum. If I understand this correctly then it's possible to excite the molecule in such a way that its vibrational energy stays the same while its rotational energy increases by some amount. This...
  17. M

    Calculating pH of buffer after adding HCl

    Homework Statement If the Tris buffer was exactly pH=9.0, calculate expected pH value after addition of 1 ml of 0.05 HCl. Buffer: 4 ml of 0.01M Tris, pH 9.0 HCl: 1 ml of 0.05M HCl Homework Equations H-H: pH=pKa+log[A-]/[HA] The Attempt at a Solution 9.0=8.21+log[A-]/[HA]...
  18. S

    Chemistry: A titration of ethylamine with HCl.

    Homework Statement For the titration of 50 mL of 0.150 M ethylamine (C2H5NH2), with 0.100 M HCl, find the pH : a) when 10 mL more of HCl has been added than is required b) when 75% of the required acid has been added Homework Equations Maybe Henderson Hasselbalch?: pH = pKa + log (base/acid)...
  19. K

    PH of solution containing HCl and bicarbonate

    This should be an easy one for some of you, but it's difficult to me because of my lack of chemistry knowledge. This is not a homework problem, but a calculation I need to do for my research. I need to calculate the pH of a 1 Liter solution containing 0.000077 M HCl and 0.03 M Na-HCO3. (not...
  20. K

    Which compound is more acidic? (without using pkA value) HCl or H2SO4

    Homework Statement Which compound is more acidic? (without using pkA value) HCl or H2SO4 Homework Equations Electronegativity. Inductive effect. The Attempt at a Solution Since sulfur is more electronegative compared to cholrine, H2SO4 is more acidic than HCl... So then I...
  21. B

    PH of HCl solution as a function of volume.

    Homework Statement You have a 1L of a 2M HCl solution. Assume that the HCl completely ionizes. a) Calculate the pH of the solution right now. b) You now add V litres of water to the solution. Find the pH of the new dilute solution in terms of V. Homework Equations pH = -log[H]...
  22. P

    Electrochemistry, emf vs HCL concentration

    Homework Statement I just conducted a lab for pchem where we took electric potential measurements with a volt meter in a solution for the reaction AgCl(s) +1/2 H2 (g) <--> HCl(aq) + Ag(s) We took the measurements using different concentrations of HCl. We were told that the...
  23. H

    Determining the diffusivity of HCl in air - an experiment

    we made an experiment to determine the diffusivity of HCl in air by knowing the Temperature, Distances moved by HCl molecules and correspondent times, the temperature of air inside the tube was equal to 27.8°C, and the procedure were: Five indicators (Litmus papers) were put inside the glass...
  24. S

    Chemistry Find number of moles of HCl to change pH of Histidine buffer.

    Homework Statement There is 400 mL of 0.2 M histidine buffer- pH 11. Find the moles of HCl that are needed to change the pH to 3.2. Homework Equations pH= pKa+log[b]/[a] The Attempt at a Solution First, this is how you would go from acid to base (acid-->base): 1. There is 400 mL of 0.2 M...
  25. B

    Creating a .0500 M HCl Calculation Help

    Hi, I have a problem regarding a lab question. It goes as follows: A student required .0500 M solution of hydrochloric acid, HCl, and has on hand a .5000 M solution. Calculate how much more of the concentrated solution, in mL units, must be pipetted if 400 mL of dilute solution are required...
  26. R

    Neutralizing a basic reaction with HCl

    Homework Statement I am reacting methyl salicylate with sodium hydroxide to produce salicylic acid. However, first it is important to add acid to neutralize the very basic solution. My question is, when determining the amount of HCl to add, do I need to take into consideration the methyl...
  27. B

    Determine volume of HCl added to propionic acid to get pH=1

    Homework Statement Given 250ml of 0.1M HC3H5O2 (Ka=1.35E-5) What volume of a)1.0M HCl is needed to lower the pH to 1.00. b) 1.00M NaC3H5O2 raise pH to 4.00 Homework Equations pH=pKa-log (HA/A) ICE chart The Attempt at a Solution I used the ice chart for the dissociation of...
  28. T

    Manganese Oxide mixed with HCL.

    Could someone please tell me What would be created when manganese oxide from an alkaline battery mixed with HCL? Theoretically, as far as I know, it should be pink, but I got a green substance.Thanks in advance
  29. H

    Trying to find info on reaction of CuCl2 + HCl+ Al(solid)

    I'm working on etching al using this as etchant though I have no clue what the balanced equation is and have not been able to find it. I'm not a chemist though I have had a few semesters of college chem. Never took inorganic and would appreciate some advice on where to look for info and...
  30. C

    HCl Dissolving in Water: Calculating pH and Titration with NaOH

    Homework Statement HCl gas dissolves in water consisting of hydrochloric acid, or hydrochloric acid. HCl dissociates fully ions as follows: HCl → H+ + Cl-. Homework Equations a) Calculate the pH of the solution, which is made ​​by dissolving 1.6 grams of HCl in 0.40 liters of water 298...
  31. T

    What is the pH of a mixture made with ammonia hydroxide and HCl?

    Homework Statement A mixture is made by adding 25 ml of 0.100M HCl to 100ml of 0.025M ammonia hydroxide. Kd = 1.76 x 10^-5 . My task is to calculate the pH. Homework Equations I think this is the reaction that follows: NH4OH + HCl <--> NH4 + H2O + Cl The Attempt at a Solution I...
  32. C

    Investigating the Reaction of HCl with Water

    Homework Statement When the gas hydrogen chloride (HCl) dissolves in water it acts as a strong acid. Homework Equations a) Write the reaction equation for hydrogen chloride dissolving in water. b) Find the pH of the solution formed when 0.040 mol of hydrogen chloride gas dissolves in...
  33. U

    Henderson Hasselbach Eq'n. Tris HCL Buffer

    i need to create a solution of 0.70M Tris HCL buffer of pH 7.9 using 12.1 M of HCL pKa = 8.3 so far this is what i have: I need 8.49 g of Tris HCL because: ...(o.7M)*0.1L *(121.4g/mol) THIS part of the calculation is right so don't worry about it. however i can't get the ratios right...
  34. M

    Shape of titration curve in vol (NaOH) vs vol (HCl)

    In an experiment titration. The NaOH was added drop wise into HCl in a conical flask. The number of drops of NaOH was recorded against the varied volume of HCl in the flask. A graph was to be plotted of number of drops of NaOH on the y-aixs to Volume of HCl on the x-axis. What would the...
  35. D

    Dissociation of HCl in Ethanol: Factors Affecting Ability

    In a textbook, HCl is said to remain as molecules in liquid ethanol. However, I still wonder whether HCl dissociates in ethanol to give H+ and Cl- ions. I think that as ethanol contains an OH group which is polar, ethanol molecules are capable of breaking the bond H-Cl in a manner similar to...
  36. E

    Exploring the Bond Length of HI vs HCl

    Click http://www.xtremepapers.net/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_s02_qp_1.pdf" for question. Question 33. The atomic Radii of Iodine is much larger than Chlorine hence the bond length of HI should be smaller compared to HCl. Apparently, it is not so...
  37. K

    Amino acid + HCl reaction and mechanism

    I was interested in knowing if my thoughts on this are right or if anyone else has any other thoughts on the reaction of any amino acid and concentrated HCl solution with water as the solvent; As an example of an amino acid such as cystine with an NH2 bonded to a carbon; I was thinking that...
  38. L

    I don't understand how HCl is not a ionic bond.

    Hydrogen has one valence electron, Chlorine has 7. Chlorine only needs one to become stable, and hydrogen wants to get rid of its only one. When they come in contact, shouldn't they react and form HCl, but held together by ionic bonds?
  39. B

    Modern I: Finding energy involving a rotator HCl molecule.

    Homework Statement The energy of a rotator ( a dumbbell-shaped object) is given by L^2/2I, where L is the angular momentum and I is the rotational inertia (moment of inertia) of the dumbbell. Consider an HCl molecule, in which the atomic weights of H and Cl are 1 and 35, respectively, and...
  40. A

    Corrosion in sea water and HCl

    Hi there, So this isn't actually my homework, I've been assigned to TA an electrochemistry lab. Problem is, I know almost nothing about electrochemistry and although I've tried to learn I'm still a bit rusty (har har!). The lab involves immersing different electrodes in seawater in a single...
  41. K

    Unraveling the Mystery: Comparing Neutralisation of HCl and CH3COOH

    Homework Statement 25 cm3 of 1 mol/dm3 ethanoic acid requires a smaller amount of sodium hydroxide for complete neutralisation than 25 cm3 of 1 mol/dm3 hydrochloric acid. True or False? 2. The attempt at a solution I selected true, but I was wrong. Both of them require the same amount...
  42. I

    Is Sodium Benzoate soluble in HCl, NaHCO3 and NaOH?

    Is Sodium Benzoate soluble in HCl, NaHCO3, and NaOH?As for HCl, I'm guessing benzoic acid is formed along with NaCl so I guess sodium benzoate is soluble in HCl? I honestly don't even know how to approach this. Thanks for the help in advance.
  43. S

    Can HCl in Anhydrous MeOH Perform Esterification?

    Hey guys, I was wondering.. would HCl in anhydrous MeOH give esterification reaction (convert carboxylic acid to ester) or do we require aqueous conditions? Thanks for any help!
  44. G

    Rate of reaction of Mg and HCl

    I have to do a lab investigating factors that affect the rate of reaction between Mg(s) and HCl(aq). I decided to change the concentration of HCl. I timed how long it took for the Mg to completely disappear when the HCl was in excess and the amount of Mg used is constant. Obviously the higher...
  45. H

    1.05 g MgO is added to 110.15ml HCL with an initial temperature

    1.05 g MgO is added to 110.15ml HCL with an initial temperature of 21.5 degrees Celsius and a final temperature of 34.5 degrees Celsius. calculate the KJ of energy released for the reaction. assume that 4.18 J of energy is required to change the temperature of one mL of solution to one Celsius...
  46. D

    Titration of Sr(OH)2 by HCl. What is the pH?

    1. COnsider the titration of 80.0 mL of 0.100 M Sr(OH)2 by 0.400 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. a. 0.0 mL b. 20 mL c.80 mL Homework Equations Henderson–Hasselbalch equation or direct -log The Attempt at a Solution a) before...
  47. J

    Delta H for 25.0 g NaOH in 100ml of 31.5% HCl

    Homework Statement How do I calculate delta H given the above info and knowing the specific heat capacity of H2O and that the change in temperature when the 2 react is 6.2 degrees C Homework Equations The Attempt at a Solution Using Q = mcdeltatheta where m=mass and...
  48. F

    Quantitative Titration - NaOH and HCl

    Homework Statement Hi, So I have this lab in which we had to titrate HCl with NaOH (of an unknown molarity) So here's the lab.. I decided to scan it because I'm not a good explainer at all, heh. The molarity of the HCl is 0.15M by the way What I was wondering is how to...
  49. P

    Titration of Trimethylamine with HCl (g)

    Homework Statement Trimethylamine has a Kb of 6.3 x 10-5. How many liters of HCl gas, measured at 1.20 bar and 298 K, must be added to 250.0 mL of 0.500 M trimethylamine to give a pH of 10.30? Homework Equations The Attempt at a Solution I don't know where to start because I don't know how...
  50. S

    HCl + Mg = decrease in pH? Why?

    I did an experiment today, I put some magnesium in HCl solution (pH of around 1 or so) , but for some reason the pH decreased (turned more acidic), and my teacher said that's expected but didn't tell me why it happens. Enlighten me, please.
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