Solve this: 97 A litre of solution containing 0 1 mole of CH3COOH and 0 1 mole of - Chemistry - Electrochemistry

Question

Solve this:

97   A   l i t r e   o f   s o l u t i o n
  c o n t a i n i n g   0 1   m o l e   o f
  C H 3 C O O H   a n d   0 1   m o l e  
o f   C H 3 C O O N a   p r o v i d e   a   b u
f f e r   o f   p H   4 74   C a l c u l a t e
  t h e   p H   o f   t h e   s o l u t i
o n   a f t e r   t h e   a d d i t i o n   o f
  0 02   m o l e   o f   N a O H   K a
  =   1 8   ×   10 - 5   ( a )
  4 92   ( b )   4 03   ( c )   8 56
  ( d )   5 32

Raveena Sharma · Accepted Answer

The solution is as follows:

CH3COOH + NaOH → CH3COONa +
H2O

Thus, concentration of HA = 0 1-0 02 = 0 8

concentration of A- = 0 1+0 8 = 0 18

So,

pH = pKa + log([HA]/[A-])
= 5 32