Acid Base Buffer Solutions Questions

Hi, excuse me if this isnt the right place. Its been a while since coming here and the layout has changed considerably. If its not, ill change it, but I have 2 questions regarding buffer solutions. What is [H3O] in a solution of .075 M HNO2 and .030 M NaNO2 HNO2 + H2O --> H3O + NO2 Ka= 4.5 x 10^-5 and... Calculate the PH of a buffer solution prepared from .155 mol phosphoric acid and .25 mol KH2PO4 in enough water to make 500 L of solution. Am I correct in thinking that you would use... Acid Base Buffer Solutions Questions
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