Will a precipitate form when there is 1.29*10^-2 M Sr+2 and 2.3*10^-6 M CrO4^2-? The Ksp=4.00*10^-5. What is the formula of the precipitate? Will a precipitate form?

Answer 1

To determine if a precipitate will form, we will compare Q (reaction quotient) to the Ksp. If Q is > Ksp, a precipitate will form. If Q < Ksp, no precipitate will form.

Sr²⁺(aq) + CrO₄^2-(aq) ==> SrCrO₄(s) The precipitate is SrCrO₄

Q = [Sr²⁺][CrO₄^2-] = [1.29x10^-2][2.3x10^-6]

Q = 2.97x10^-8

Compared to Ksp (4.00x10^-5) Q is < Ksp so a precipitate will not form