Calculate the concentration of chromate ion, CrO42–, in a saturated solution of CaCrO4 (K_{sp} = 7.1 \times 10^{–4} Ksp =(7.1×10^-4) 7.1 \times 10^{–4} M7.1×10 –4M

3.5 \times 10^{–2} M3.5×10 ^–2M

3.5 \times 10^{–4} M3.5×10 ^–4M

5.0 \times 10^{–7} M5.0×10^–7M

0.027 MM