## Chemistry and Chemical Reactivity (9th Edition)

$s=0.0347\ M$
With $pH=12.60$, $[OH^-]=10^{pKw-pH}=10^{-1.4}\ M$ $Ksp=[Ca^{2+}][OH^-]^2$ $5.5\dot{}10^{-5}=s\dot{}(10^{-1.4})^2$ $s=0.0347\ M$