Question

1. Liquid Plumber, a drain cleaner, has a pH of 14.32. What is the pOH of this solution and what is the hydroxide ion concentration?answer pOH -0.33 [OH^+]2.1M

2. A solution is made with [Pb2+] = 2.5x10-3 M and [I-] = 4.0x10-3M. What is the reaction quotient, Q, for the dissolution of PbI2(s) in water? Do you expect PbI2(s) to precipitate? Ksp(PbI2) = 6.5x10-4

answer) Q=4.0X10^-8 precipitate:no

3.The pKa for the ammonium ion (NH4+) in water is 9.3. What is the pH of a 100mL solution that contains 0.20M ammonium ion and 0.10M ammonia?

NH4+(aq) + H2O(l) ? H3O+(aq) + NH3(aq)

Answer:9.0

i just need explanations.. answer provided