Calculate the molar solubility (S or x) of copper(2) sulfide in 1.2M NH3(aq). Provide the formula of the complex and a balanced equation for its formation. What is the molar solubility (S) of CuS in pure water. Is the CuS More of Less soluble in pure water? Ksp CuS=1.3 *10^-36 Kf complex=1.2 * 10^13.