When 100 ML Each of 2

Multiple Choice

When 100 mL each of 2.0 × 10^-5 M Ca²⁺ and 2.0 × 10^-3 M CO₃^2- are mixed, what is the remaining Ca²⁺ ion concentration and is precipitation complete? The solubility product constant of CaCO₃ is 2.8 × 10^-9.

A) 2.8 × 10^-6, no
B) 1.0 × 10^-3, no
C) 6.9 × 10^-5, no
D) 2.8 × 10^-3, no
E) 2.8 × 10^-6, yes