Name ____________________________________ Hour__________
Molarity problems
1. 1 L = _____________ mL
2. Calculate the molarity of the following solutions
a. 1.5 g of NaCl is dissolved in water to make 250 mL of solution
b. 0.4 g of NaOH is dissolved in water to make 150 mL of solution
3. How many moles of AlCl3 are in 100 mL of a 0.50M solution?
4. How many moles of Ca(OH)2 are in 25 mL of 1.5M solution?
5. A reaction calls for the use of 5.00 mol of NH4OH. You have a bottle of 1.5M NH4OH. How many milliters of the
solution should you add?
6. A reaction calls for the use of 0.33 mol H2SO4. You have a bottle of 0.1M H2SO4. How many mL should you add?
7. How many moles KClO3 are in 30 mL of a 0.100 M solution? How many grams?
8. A lab procedure calls for the use of 100 mL of 0.5M KOH. How many grams of KOH should you add to water to
make this solution?
9. A lab procedure calls for 40 mL of 0.1 M NaHCO3. You have a stock bottle of 2.0 M NaHCO3. How many milliliters
of the stock solution should you use to make the required solution? How many milliliters of water?
10. A lab procedure calls for 50 mL if 0.02M Li2SO4. You have a stock bottle of 1.0 M Li2SO4. How many milliliters of
the stock solution should you use to make the required solution? How many milliters of water?
11. A lab procedure calls for 50 mL of 0.25 M NaOH. You place 100 g of NaOH in enough water to make 1.00 L of
solution. How many mL of this solution should you use to make the solution called for in the lab procedure?
12. What information is conveyed by the following label 0.5 M NaOH?
13. If you evaporate 32 mL of a 0.50 M CuSO4 to dryness, how many grams of solid copper sulfate would be left on
the bottom of the beaker?
14. What is the molarity of a solution made by dissolving 11.7 g of NaCl in 250 mL of water?
15. How many mL of a 0.5 M K2Cr2O7 must be evaporated to dryness in order to end up with 2.948 g of solid K2Cr2O7?
16. Starting with solid copper (II) sulfate, how would you prepare 100 mL of a 0.25 M CuSO4 solution? Give details…
17. An ace chemistry student mixes 60 mL of a 0.5 M NaOH solution with 140 mL of a 0.3 M NaOH solution. What is
the molarity of the resulting sodium hydroxide solution?
Empirical/Molecular Formula and Molarity/Dilution Review
1. Explain the process of an ionically bonded salt dissolving
2. What are three ways to help a solute dissolve in a solvent?
3. Write the empirical formula of C5H10 and N2O6
4. A molecule with an empirical formula of CO has a molecular mass of 84 g/mol. What is its molecular formula?
5. A compound was analyzed and found to contain 13.5 g Ca, 10.8 g O, and 0.675 g H. What is the empirical
formula of the compound
6. NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O. Calculate the empirical formula of NutraSweet and
find the molecular formula. (The molar mass of NutraSweet is 294.30 g/mol)
7. A 3.927 g sample of glycerin was found to contain 1.536 g carbon, 0.345 g hydrogen, and the rest oxygen. Find
the empirical formula of this important lubricant.
8. A 4 g sugar cube (sucrose: C12H22O11) is dissolved in a 350 ml teacup filled with hot water. What is the molarity of
the sugar solution
9. A 250 ml solution is made with 0.50 moles of NaCl. What is the molarity of the solution?
10. What is the volume of 3.0 M solution of NaCl made with 526g of solute?
11. How many grams of CaCl2 would be required to produce a 3.5 M (molar) solution with a volume of 2.0 L?
12. How many moles of Sr(NO3)2 would be used in the preparation of 2.50 L of a 3.5 M solution?
13. Calculate the amount of 1 M NaOH aqueous solution needed to make 100 mL of 0.5 M NaOH aqueous solution.
14. What would be the concentration of a solution made by diluting 45.0 mL of 4.2 M KOH to 250 mL?
15. If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560 mL more water to it?
16. If I dilute 250 mL of 0.10 M lithium acetate solution to a volume of 750 mL, what will the concentration of this
solution be?