Determine the pH of the following solutions using approximations wherever appropriate:
1. pH of 100mL of 0.250 M solution of acetic acid which is having 0.250 M of sodium acetate; pKa = 4.75, upon addition of the 5.0mL of0.10 M HCl
2. 1.0 X 10-8 M solution of HCl in the water.