Drama, Film, and Mass Communication homework help. The solubility product constant at 25°C for AgI(s) in water has the value 8.3 × 10-17. Calculate ?Grxn at 25 °C for the process AgI(s) ? Ag+(aq) + I- (aq) where [Ag+] = 9.1 × 10-9 and [I-] = 9.1 × 10-9.