CHM 1045 Dilutions Practice Problems Answers

Molarity & Dilution Practice Problems Answers

1. Determine the molarity of a solution containing 2.4 mol of KI in 140 mL
total volume of solution ANS: 17.1 M KI
2. What is the concentration of a solution of NaCl if 40 mL of a 2.5 M NaCl
solution is diluted to a total volume of 500 mL? ANS: 0.2 M NaCl
3. What is the concentration of a solution of KOH if 75 mL of a 2.25 M KOH
solution is diluted to a total volume of 250 mL? ANS: 0.68 M KOH
4. Determine the number of moles of NaOH in 500 mL of a 0.6 M NaOH
solution. ANS: 0.3 mol NaOH
5. How many mL of 6.0 M HCl is needed to make 250 mL of a 1.5 M HCl
solution? ANS: 62.5 mL of 6.0 M HCl
6. Determine the molarity of the solution containing 1.5 mol of KNO 3 in 250 mL
total volume of solution. ANS: 6 M KNO3
7. What is the volume of 0.5 M NaI needed to have 0.25 mol NaI?
ANS: 0.5 L of 0.5 M NaI
8. How many mL of 2.0 M CrCl3 is needed to make 400 mL of a 0.25 M CrCl3
solution? ANS: 50 mL of 2.0 M CrCl3
9. How many mL of 4.0 M NaCl is needed to make 50 mL of a 0.5 M NaCl
solution? ANS: 6.25 mL of 4.0 M NaCl
10. How many grams of LiOH is needed to make 250 mL of a 0.33 M LiOH
solution? ANS: 1.98 g LiOH
11. What is the concentration of a solution of CaSO3 if 8.0 mL of a 1.0 M CaSO3
solution is diluted to a total volume of 100 mL? ANS: 0.08 M CaSO3
12. How many grams of Ca(NO2)2 is needed to make 800 mL of a 2.0 M Ca(NO2)2
solution? ANS: 211.36 g Ca(NO2)2