Find pH of 0.1M

If the equilibrium constant for the reaction of weak acid HA with strong base is 10^(9) , then pH of 0.1M Na A is:

Find the pH of " 0.1 M NaHCO_(3)" . Use data (K_(1)=4xx10^(-7),K_(2)=4xx10^(-11) for H_(2)CO_(3), log 4=0.6) :

What is the pH of 0.1 M HCl?

The pH of 0.1 M ammonium hydroxide is

The pH of 0.1M solution of the following salts decreases in the order

The pH of 0.001 M HCN is