Q.1Explain why CH3COOH2^+ is in terms of protonic concept?

Q.2 0.1 mole HCl is dissolved in distilled water of volume V then at a limit V =infinite pH of the solution is equal to______?
Q.3One litre of water contains 10^-5 moles of H^+ ions at 25 degree Celcius.Degree of ionisation of water is ________?
Q.4 Approximate pH of 0.01M aqueous H2S solution when K1 and K2 for H2S at 25 degree Celcius are 10^-7 and 1.3*10^-13 respectively:______?