What is the weight percent of NH3 in the window cleaner?

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In summary, the problem involves finding the weight percent of NH3 in a window cleaner solution. To do this, a sample of the cleaner is diluted with water and then titrated with HCl to reach an endpoint. The volume of the titrant and its concentration can be used to calculate the millimoles of NH3 in the solution, which can then be used to determine the weight percentage.
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Mag
[SOLVED] titration need help getting started

A 10.231g sample of window cleaner containing ammonia was diluted with 39.466g of water. Then 4.676g of solution was titrated with 14.22mL of 0.1063 M HCl to reach a bromocresol green endpoint. Find the weight percent of NH3 (FW 17.031) in the cleaner.

I keep trying to find someway of getting the 4.676g solution to a volume amount so i can find the mmol of the analyte.

thanks
mag
 
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Mag said:
(snip)Find the weight percent of NH3 (FW 17.031) in the cleaner.(snip)

Do you need to calculate a volume?
 
  • #3
Mag said:
Then 4.676g of solution was titrated with 14.22mL of 0.1063 M HCl to reach a bromocresol green endpoint.

You may start from here, as this sentence tells you that their millimole amounts are equal. You can find millimoles by multiplying volume by concentration, as [tex]\displaystyle mL\times \frac {mmol}{mL}[/tex] gives [itex]\displaystyle mmol[/itex]. If 4.676 g of that solution is equal to the millimoles of [itex]\displaystyle NH_3[/itex], you can calculate a weight percentage from there.
 
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Related to What is the weight percent of NH3 in the window cleaner?

1. What is titration and why is it used in scientific experiments?

Titration is a laboratory technique used to determine the concentration of a substance in a solution. It involves adding a known volume of a solution with a known concentration (called the titrant) to a solution with an unknown concentration (called the analyte) until the reaction between the two is complete. The endpoint of the reaction is then used to calculate the concentration of the analyte. Titration is commonly used in scientific experiments because it is a precise and accurate method for determining the concentration of a substance.

2. What equipment is needed for a titration experiment?

The equipment needed for a titration experiment includes a burette, a pipette or measuring cylinder, a flask or beaker, a magnetic stirrer (or a glass rod for manual stirring), and an indicator solution. A burette clamp and stand may also be used to hold the burette in place.

3. How do you prepare the solutions for a titration experiment?

The solutions used in a titration experiment must be accurately prepared to ensure accurate results. The titrant solution should be standardized by determining its exact concentration through a separate titration or by using a primary standard. The analyte solution should also be accurately prepared by measuring the exact volume and recording its concentration, if known. Both solutions should be properly labeled and handled with care to avoid contamination.

4. How do you perform a titration experiment?

To perform a titration experiment, the burette should be filled with the titrant solution and the initial volume should be recorded. A known volume of the analyte solution is then added to a flask or beaker, along with a few drops of indicator solution if needed. The titrant is then slowly added to the analyte solution while stirring continuously until the endpoint is reached, as indicated by a color change. The final volume of titrant used is recorded and used to calculate the concentration of the analyte.

5. What are some common sources of error in a titration experiment?

There are several sources of error that can affect the accuracy of a titration experiment. These include human error in reading the volume of the burette or pipette, contamination of solutions, and errors in measuring the initial or final volume of the titrant. To minimize these errors, it is important to properly calibrate and handle the equipment, use clean and accurately measured solutions, and repeat the experiment multiple times to ensure consistent results.

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