Solutions Worksheets
Do all math problems on your own paper. Label with the section heading and staple to
this worksheet
Molarity Calculations
1. What is the molarity of a solution in which 58.5g of NaCl are dissolved in 1.0L of solution?
2. What is the molarity of a solution in which 10.0g of AgNO3 is dissolved in 500.mL of
solution?
3. How many of grams of KNO3 should be used to prepare 2.00L of a 0.500M solution?
4. What volume of 0.25M solution can be made from 5.0g of KCl?
5. Find the molarity of a 450.mL solution containing 13.7g of ZnSO4.
6. How many grams of CuCl2 are required to make 75.0mL of a 0.20M solution?
7. How many grams of CuSO4 5H2O are needed to prepare 100.mL of a 0.10M solution?
8. What is the molarity of a solution in which 15.0g of K2SO4 is dissolved in 2.0L of solution?
9. What is the molarity of a solution in which 25.0g of MgCl2 is dissolved in 750.mL of
solution?
10. What volume of 1.5M solution can be made from 25.0g of Na2CO3?
Dilution Calculations
1. How much 18M sulfuric acid is needed to prepare 250mL of a 6.0M solution?
2. 17mL of 12M hydrochloric acid is diluted to 100.mL. What is the concentration of the new
solution?
3. To what volume should 25mL of 15M nitric acid be diluted to prepare a 3.0M solution?
4. To what volume should 50.mL of 12M hydrochloric acid be diluted to produce a 4.0M
solution?
5. If 25.0mL of 18M sulfuric acid is diluted to 550.mL, what is the concentration of the
diluted solution?
6. To how much water 100.mL of 18M sulfuric acid should be added to prepare a 1.5M
solution?
Solubility Curves
1. Which compound is least soluble at 20oC? At 80oC?
2. Which substance is the most soluble at 10oC? At 50oC? At 90oC?
3. The solubility of which substance is most affect by changes in temperature?
4. The solubility of which substance is least affected by changes in temperature?
5. Are the following solutions saturated, unsaturated or supersaturated? (assume all
dissolved in 100g of water)
a. 50g KNO3 at 50oC
d. 50g of KCl at 80oC
b. 100g of NaNO3 at 80oC
e. 65g of NH4Cl at 70oC
c. 30g of KNO3 at 25oC
f. 90g of KNO3 at 60oC
6. NH3 is a gas. Describe/explain what happens to its solubility as the temperature goes
from 20oC to 80oC
7. For each of the following, indicate the temperature at which the solution described would
be saturated
a. 30g of NH4Cl
d. 20g of KNO3
b. 130g of NaNO3
e. 40g of KCl
c. 50g of Na2SO4
f. 60g of NH3
8. For each of these, indicate how many grams of solute (per 100g of water) will dissolve
a. NaNO3 at 70oC
c. KI at 20oC
b. NH4Cl at 50oC
d. KClO3 at 90oC
9. At 40oC, how many grams of NaNO3 will make a saturated solution if the NaNO3 is added
to 100g water
10. At 80oC, how many grams of KCl can be dissolved in 200g of water?
11. At what temperature will 10g of NH3 dissolved completely in 100g of water to make a
saturated solution?
12. At 40oC, how many grams of KNO3 can be dissolved in 300g of water?
13. At 55oC, how many grams of NaNO3 can be dissolved in 50g of water?
14. At 80oC, you have a saturated solution of KClO3. How many grams of solid precipitate will
form if the solution is cooled to 50oC?
15. How many grams of NaNO3 precipitate will form if a saturated solution at 70oC is cooled
to 10oC?
Electrolytes
Classify the following as an electrolyte or a nonelectrolyte:
1. NaCl(aq)
6. C12H22O11(aq) (sugar)
2. CH3OH(l) (methyl alcohol)
7. NaOH(aq)
3. C3H5(OH)(aq) (glycerol)
8. C2H5OH(l) (ethyl alcohol)
4. HCl(aq)
9. CH3COOH(aq) (acetic acid)
5. NaCl(s)
10. H2SO4(aq)
Polar vs. Nonpolar
Check the appropriate columns as to whether the solute is soluble in a polar or nonpolar solvent
Solvents
Solutes
Water
CCl4 (nonpolar)
Alcohol
NaCl
Iodine
Ethanol
Benzene (nonpolar)
Bromine
KNO3
Toluene (nonpolar)
Ca(OH)2
Bronsted-Lowry Acids and Bases
Label the Bronsted Lowry acids (A), bases (B), conjugate acids (CA) and conjugate bases (CB) in
the following reactions.
1. H2O + ClOH- + HCl
4. HSO4 + H2O
SO4 + H3O+
2. C6H5NH2 + H2O
C6H5NH3+ + OH-
5. HBr + OH-
3. H2SO4 + OH-
HSO4 + H2O
6. NH3 + H2O
H2O
+ Br-
NH4 + OH-
Conjugate Acid-Base Pairs
Acid
Base
HSO4
H3PO4
F
NO3
H2PO4
H2O
SO4
H2O
NH3
pH and pOH Calculations
Part1 – calculate the pH and identify as acidic, basic, or neutral
[H+]
pH
1.0x10-6 M
A, B or N
2.61x10-2 M
4.0x10-9 M
5.9x10-12 M
1.0x10-7 M
Part 2 – calculate the [H+] and identify as acidic, basic or neutral
pH
[H+]
A, B or N
4.00
5.89
7.00
12.25
9.11
Part 3 – Calculate the missing [H+] or OH-] and identify as acidic, basic or neutral
1. [H+] = 4.2x10-6 M
[OH-] = ____________ M
A, B or N
2. [H+] = ______________
[OH-] = 4.3x10-5 M
A, B or N
Part 4 – Complete the following chart
pH
pOH
3.68
[H+]
[OH-]
A, B or N
8.60x10-5 M
1..80x10-9 M
5.48
10.48
3.82x10-11 M
2.85
Acid Base Titration
1. A 25.0mL sample of HCl was titrated to the endpoint with 15.0mL of 2.0M NaOH. What
is the molarity of the HCl?
2. A 10.0mL sample of H2SO4 was exactly neutralized by 13.5mL of 1.0M KOH. What is the
molarity of the H2SO4?
3. How much 1.5M NaOH is necessary to exactly neutralize 20.0mL of 2.5M H3PO4?
4. How much of 0.50M HNO3 is necessary to titrate 25.0mL of 0.050 M Ca(OH)2 solution to
the endpoint?
5. What is the molarity of NaOH solution if 15.0mL is exactly neutralized by 7.5mL of a
0.020M HClO3 solution?
6. 25.0mL of 1.50M LiOH are neutralized by 15.0mL nitric acid. What is the molarity of
HNO3?
7. 50.0mL of an unknown solution of Ca(OH)2 are titrated with 0.15M HCl. Find the
molarity of the Ca(OH)2 solution if 83mL of acid are required to reach the equivalence
point.
8. What volume of 0.75M H2SO4 is required to neutralize 25.0mL of 0.427M KOH?
9. What volume of 0.083M H3PO4 is required to neutralize 30.0mL of 0.025M Ba(OH)2?
10. What is the molarity of a NaOH solution if 15.0mL is exactly neutralized by 7.5mL of a
0.02M HC2H3O2 solution?