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CHEM 115 |
HOMEWORK 1 |
NAME_________________ |
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Due Wed. April 11, 2001 |
COMP. HMWRK: Solubility Eq. 1-3 |
1. A 1.37 M solution of citric acid (H3C6H5O7) in water has a density of 1.10g/cm3.
Or
A 0.688 m solution of citric acid (H3C6H5O7) in water has a density of 1.049g/cm3.
Calculate the
a. mass percent
mass % = |_____________
b. molality / Molarity
m = |_________________
c. mole fraction citric acid
X = |_________________
2. Calculate the pH of a solution that is 0.50 M CH3NH2 and 0.70 M CH3NH3Cl.
pH = |__________________
3. Calculate the pH of solution after 10.0 ml of 1.0 M NaOH are added to 100 ml of the buffer in problem # 2
pH= |______________
4. Calculate the pH of a solution after 10.0 ml of 1.0 M HCl are added to the buffer in problem # 2
pH = |__________________
5. Calculate the pH of a 1.50 M NH4ClO4 solution.
pH = |__________________
6. Calculate the molar solubility of Ba(IO3)2 if its solubility product is 1.57 x 10-9.
Sol. = |_________________
7.a. Calculate the solubility product Ksp for BaSO4 if the solubility is 0.0245 g of BaSO4 in 100 ml of water at 25oC.
Ksp. = |__________
b. Calculate the solubility product for Co(IO3)2 if its molar solubility is 1.1 x 10-2 mol/L at 18oC.
Sol. Prod. = |___________
8. Which salt is more soluble, AgCn or Zn(CN)2?
AgCN, Ksp = 2.2 x 10-16 Zn(CN)2, Ksp = 3 x 10-16
9. Chalk is CaCO3 and at 25oC its Ksp = 4.5 x 10
–9, What is the molar solubility of calcium carbonate? How many grams will dissolve in 100 ml of aqueous solution?
Sol = |_________________
Mass = |_______________
10. The solubility product for CaF2 is 4.9 x 10-11. Estimate the solubility of CaF2 in
a. 0.50 M NaF
Sol. = |________________
b. 0.25 M CaCl2
Sol. = |________________