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8.2.b Solution Concentration/ Molarity Name

Solve the following problems, showing all work clearly! CIRCLE your answers.

Molarity Calculations: M= mol/L

1.) A solution contains 96 grams of CH3OH in 2 Liters of solution. What is the molarity of this solution?

2.) What quantity (in moles) of potassium nitrate, KNO3, would you add to 350 mL of solution to prepare a 0.2-M

solution?

3.) How many grams of NaCl are required to make 450 mL of a 0.50-M solution?

4.) What volume of 1.80-M HC2H3O2 solution contains 0.6 moles of HC2H3O2?

5.) Calculate the molarity of a 1500 mL solution that contains 200 g of Magnesium Chloride.

Dilution Equations: M1V1 = M2V2

6.) Calculate the volume required to prepare 750 mL of a 2.5 M KClO3 solution from 5 M KClO3.

7.) A 10.0 mL sample of concentrated HI (5.51 M) is diluted to a final volume of 250.0 mL. What is the molarity

of the final solution?

8.) A 25.0 mL sample of concentrated H3PO4 (14.7 M) is diluted to a final volume of 500.0 mL. What is the

molarity of the final solution?

Explain how you would make the following solutions. You should tell how many grams of the substance you

need to make the solution, not how many moles. Rearrange the molarity equation to solve for moles.

9.) 2.0 L of 6.0 M HCl

10.) 1.5 L of 2.0 M NaOH

11.) 0.75 L of 0.25 M Na2SO4

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