Question

An acidic buffer contains equal concentration of acid and salt . The dissociation constant of acid is 10^-5. The ph of the buffer solution is

Answer 1

in buffer solutions pH=oka+log salt/acid

given acid and salt have same concentration....so pH=pka

here dissociation constant ka is given

pka=-log ka=-log10^-5=5 .

so pH=pka=5