What happens when calcium and chromate solutions are mixed to give 2.00×10−2mol L−12.00×10−2mol L−1 Ca2+Ca2+ and 3.00×10−2mol L−13.00×10−2mol L−1 CrO42−CrO42−?

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter14: Chemical Equilibrium
Section: Chapter Questions
Problem 14.83QE: Some barium chloride is added to a solution that contains both K2SO4 (0.050 M) and Na3PO4 (0.020 M)....
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Learning Goal:

To understand the relationship between precipitation and the solubility product and to be able to predict whether a substance will precipitate or not.
Precipitation is the formation of an insoluble substance. For the equation AB(s)⇌A+(aq)+B−(aq)AB(s)⇌A+(aq)+B−(aq), precipitation represents a shift to the left and the production of a solid. From Le Châtelier's principle, we know that when the product of the concentrations of A+A+ and B−B− ions gets above a certain level, the reaction will respond by shifting left to decrease the concentrations of A+A+ and B−B− ions. This critical level, KspKsp Q=[A+][B−]Q=[A+][B−]. where QQ is the ion product.

When Q>KspQ>Ksp, precipitation occurs until QQ is equal to KspKsp

When Q≤KspQ≤Ksp, a precipitate does not form.
 

Part A

Calcium chromate, CaCrO4CaCrO4, has a KspKsp value of 7.10×10−47.10×10−4 . What happens when calcium and chromate solutions are mixed to give 2.00×10−2mol L−12.00×10−2mol L−1 Ca2+Ca2+ and 3.00×10−2mol L−13.00×10−2mol L−1 CrO42−CrO42−?
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Calcium chromate, , has a value of . What happens when calcium and chromate solutions are mixed to give and ?
A precipitate forms because Q>KspQ>Ksp.
A precipitate forms because Q<KspQ<Ksp.
No precipitate forms because Q>KspQ>Ksp.
No precipitate forms because Q<KspQ<Ksp.
 
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Part B

What concentration of the lead ion, Pb2+Pb2+, must be exceeded to precipitate PbBr2PbBr2  from a solution that is 1.00×10−21.00×10−2 mol L−1mol L−1 in the bromide ion, Br−Br−? KspKsp 4.67×10−64.67×10−6 .
Express your answer with the appropriate units.
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