Calculating the molarity of ions

In summary, the question asks for the molarity of Ca2+ required for a reaction mixture with a total volume of 4 L and 9.99 g of solid CaSO4, based on the given balanced equation and stoichiometric ratios. After converting the mass of CaSO4 to moles, the molarity of Ca2+ cannot be determined without additional information.
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Homework Statement


When a reaction mixture with a total volume of 4 L that contains 9.99 g of solid CaSO4 was stoichiometrically produced as per the balanced equation with 2.50 L of aqueous Ca2+, what molarity (M) of Ca2+ was required?

Al2(SO4)3(aq) + 3 CaBr2(aq) → 2 AlBr3(aq) + 3 CaSO4(s)


Homework Equations


Stoichiometric ratios.


The Attempt at a Solution


Conversion of CaSO4 to mols = 1.36 mols
molar mass = 340.0 mol/L
After this, I don't know how to find the molarity of the Ca2+ ions...
 
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  • #2
Not sure if I understand what you are asking. I assume you mean you need to know what was molarity of Ca2+ solution if mass of precipitated calcium sulfate was 9.99g.

First - 9.99g is not 1.36 mole.

Second - concentration is moles/volume.

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Related to Calculating the molarity of ions

1. What is molarity and why is it important in calculating ions?

Molarity is a concentration unit that represents the number of moles of a substance per liter of solution. It is important in calculating ions because it allows us to accurately measure the concentration of ions in a solution, which is crucial in many scientific experiments and processes.

2. How do you calculate the molarity of ions?

To calculate the molarity of ions, you need to know the number of moles of the ion present and the volume of the solution. You can then use the formula M = moles of ion / volume of solution (in liters) to determine the molarity of the ions.

3. Can you calculate the molarity of multiple ions in a solution?

Yes, you can calculate the molarity of multiple ions in a solution by using the same formula of M = moles of ion / volume of solution. You will need to calculate the moles of each ion separately and then add them together to get the total molarity of ions in the solution.

4. How does temperature affect the molarity of ions?

Temperature can affect the molarity of ions in a solution because it can alter the volume of the solution. As temperature increases, the volume of the solution expands, which decreases the molarity of the ions. Similarly, as temperature decreases, the volume of the solution decreases, increasing the molarity of the ions.

5. Can you convert molarity of ions to other concentration units?

Yes, you can convert molarity of ions to other concentration units, such as parts per million (ppm) or percentage (%) concentration. These conversions require additional calculations and depend on the specific substance and its molecular weight. It is important to always double check your conversions to ensure accuracy.

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