Solution-Solution of methylamine, 1. Calculate the pH of a

1. Calculate the pH of a 0.300 M solution of lactic acid, for which the Kavalue is 1.40 x 10-4.
2. Calculate the pH of a 0.30 M solution of methylamine(CH3NH2, Kb = 4.4 x 10-4.)
3. Give the conjugate base of HS–. Write it ignoring super and subscripts (so, HPO42- would be HPO42-
4. What is the pH of a 0.261 M solution of RbOH?