Question

Calculate the pH of 0.005 M H2SO4

Answer 1

H2SO4 is a strong, diprotic acid. The equation for its ionization is
             H2SO4(aq)   -->    2H+   +  SO4-

Since the equation tells us that each molecule of acid will produce 2 hydrogen ions, the concentration of the H+ ion must be 2 x .0050M or .010M

Using the definition of pH=-log[H+]= -log(.010M) = 2

Answer 2

H2so4  H+=2.  pH=-log[H)]    2*5*10-³.       10*10-³=-log[10]-²= 2