Assignment:
Q1. Which of the following salts would give you the lowest concentration of lead ions in solution if you placed 1 mole of the salt in a liter of water?
a. PbSO4 Ksp= 1.8 x 10-8
b. PbCO3 Ksp= 1.5 x 10-13
c. PbSeO4 Ksp= 1.5 x 10-7
d. PbCrO4 Ksp= 1.8 x 10-14
Q2. Which of the following salts would give you the lowest concentration of sulfate ions in solution if you placed 1 mole of the salt in a liter of water?
a. BaSO4 Ksp= 1.1 x 10-10
b. CaSO4 Ksp= 2.4 x 10-5
c. SrSO4 Ksp= 2.8 x 10-7
d. PbSO4 Ksp= 1.8 x 10-8
Q3. Which of the following salts would give you the highest concentration of calcium ions in solution if you placed 1 mole of the salt in a liter of water?
a. CaCO3 Ksp= 3.8 x 10-9
b. CaCrO4 Ksp=7.1 x 10-4
c. CaSO4 Ksp= 2.4 x 10-5
d. CaHPO4 Ksp= 2.7 x 10-7
Q4. Which of the following salts would give you the lowest concentration of calcium ions in solution if you placed 1 mole of the salt in a liter of water?
a. CaCO3 Ksp= 3.8 x 10-9
b. CaCrO4 Ksp=7.1 x 10-4
c. CaSO4 Ksp= 2.4 x 10-5
d. CaHPO4 Ksp= 2.7 x 10-7
Q5. Which of the following salts would give you the highest concentration of hydroxide ions in solution if you placed 1 mole of the salt in a liter of water?
a. Fe(OH)2 Ksp= 7.9 x 10-15
b. Ca(OH)2 Ksp= 7.9 x 10-6
c. Ni(OH)2 Ksp= 2.8 x 10-16
d. Zn(OH)2 Ksp= 4.5 x 10-17
Q6. What mass of potassium bicarbonate (KHCO3) must be added to 500 mL of a 0.200 M carbonic acid solution to make a buffer with pH = 6.30?
a. 8.73 g
b. 4.55 g
c. 24.07 g
d. 8.33 g
Q7. Which of the following salts would give you the lowest concentration of hydroxide ions in solution if you placed 1 mole of the salt in a liter of water?
a. Fe(OH)2 Ksp= 7.9 x 10-15
b. Ca(OH)2 Ksp= 7.9 x 10-6
c. Ni(OH)2 Ksp= 2.8 x 10-16
d. Zn(OH)2 Ksp= 4.5 x 10-17
Q8. What mass of NH4Cl must be added to 500 mL of a 0.150 M NH3 solution to make a buffer with pH = 9.50?
a. 1.14 g
b. 2.54 g
c. 6.97 g
d. 2.31 g
Q9. What mass of NH4Cl must be added to 200 mL of a 0.200 M NH3 solution to make a buffer with pH = 9.30?
a. 1.95 g
b. 1.12 g
c. 2.34 g
d. 1.11 g
Q10. Which of the following salts would give you the highest concentration of phosphate ions in solution if you placed 1 mole of the salt in a liter of water?
a. Ba3(PO4)2 Ksp= 1.3 x 10-29
b. Ca3(PO4)2 Ksp= 1.0 x 10-25
c. Pb3(PO4)2 Ksp= 3.0 x 10-44
d. Sr3(PO4)2 Ksp= 1.0 x 10-31