Question

1.What is the molar solubility of CaCO3 (Ksp = 2.5 x 10^-9) in an aqueous solution where the carbonate ion concentration is 0.30 M at 25°C?

2. Two solutions are mixed; one solution contains Al³⁺ and the other solution contains OH^-. If, at the instant of mixing, but before any precipitate forms, [Al³⁺] = 3.2 x 10^-10 M and [OH^-] = 5.6 x 10^-8 M, which of the following statements is true? The Ksp value for Al(OH)3 is 4.6 x 10^-33 at 25°C?

No precipitate forms because Qsp > Ksp

A precipitate forms because Qsp > Ksp

No precipitate forms because Qsp < Ksp

A precipitate forms because Qsp < Ksp


3.Which salt is the least soluble in water at 25°C?

Which salt is the least soluble in water at 25°C?

	Mg(OH)2 (Ksp = 1.8 x 10-11)
	PbI2 (Ksp = 6.5 x 10-9)
	CaF2 (Ksp = 3.4 x 10-11)
	CaC2O4 (Ksp = 2.3 x 10-9)