CHE 113 EXAMPREP CERTIFICATION
EVALUATION EXAM QUESTIONS AND
ANSWERS 2026
◉ .020 mol of HA in sufficient water to yield 1.00L of solution. The
pH of the solution is 4.93 @ 25 degrees celcius. The Ka of the HA is
___________
Answer: 1.) solve for [concentration of H+] by doing 10^-pH
2.) take that number and square it (because it equals x)
3.) divide it by 0.02
◉ low solubility = ____________
Answer: low x, small Ka
◉ ↑ Ksp = _____________
Answer: ↑ solubility
◉ bases that react with acids ____________ solubility
Answer: increase
◉ how do you determine which ions precipitate first
, Answer: ions with the smallest Ksp precipitate first
◉ Suppose 175 mL of 0.15 M AgNO3 is added to 650 mL of 0.0080 M
K2SO4. Will a precipitate form?
(Ksp, Ag2SO4 = 1.5 × 10-5)
Answer: 1.) get moles of each piece of the solid by multiplying given
M by given volume (make sure it is in liters)
2.) multiply by mole ratio so you get correct moles of solid ion on
top.
3.) plug into Q equation and compare to K
4.) if K>Q no precipitate will form
◉ Calculate the molar solubility of silver chloride in a solution that is
6.5 × 10-3 M in silver nitrate. (Ksp,AgCl = 1.6 × 10-10.)
Answer: 1.) the given value is one of the X's
2.) set equal to Ksp and solve for other X
◉ Which of the following would be more soluble in acidic solution
than in a neutral or basic solution?
Answer: Bases are more soluble in an acidic solution
◉ Calculate the molar solubility of copper(II) hydroxide if
Ksp = 2.2 × 10-20
EVALUATION EXAM QUESTIONS AND
ANSWERS 2026
◉ .020 mol of HA in sufficient water to yield 1.00L of solution. The
pH of the solution is 4.93 @ 25 degrees celcius. The Ka of the HA is
___________
Answer: 1.) solve for [concentration of H+] by doing 10^-pH
2.) take that number and square it (because it equals x)
3.) divide it by 0.02
◉ low solubility = ____________
Answer: low x, small Ka
◉ ↑ Ksp = _____________
Answer: ↑ solubility
◉ bases that react with acids ____________ solubility
Answer: increase
◉ how do you determine which ions precipitate first
, Answer: ions with the smallest Ksp precipitate first
◉ Suppose 175 mL of 0.15 M AgNO3 is added to 650 mL of 0.0080 M
K2SO4. Will a precipitate form?
(Ksp, Ag2SO4 = 1.5 × 10-5)
Answer: 1.) get moles of each piece of the solid by multiplying given
M by given volume (make sure it is in liters)
2.) multiply by mole ratio so you get correct moles of solid ion on
top.
3.) plug into Q equation and compare to K
4.) if K>Q no precipitate will form
◉ Calculate the molar solubility of silver chloride in a solution that is
6.5 × 10-3 M in silver nitrate. (Ksp,AgCl = 1.6 × 10-10.)
Answer: 1.) the given value is one of the X's
2.) set equal to Ksp and solve for other X
◉ Which of the following would be more soluble in acidic solution
than in a neutral or basic solution?
Answer: Bases are more soluble in an acidic solution
◉ Calculate the molar solubility of copper(II) hydroxide if
Ksp = 2.2 × 10-20
