\(\mathrm{Ag}^{+}\) is \(\mathrm{S}\)
\(\mathrm{Cl}^{-}\) is \(0.1\)
\(\mathrm{K}_{\mathrm{sp}}=\left[\mathrm{Ag}^{+}\right]\left[\mathrm{Cl}^{-}\right]\)
\(1.6 \times 10^{-10}=S \times 0.1\)
\(1.6 \times 10^{-9}=S\)