The ratio of pH of a solution containing 1 mole of CH3COONa+1 mole of HCl per litre and of other solution containing 1 mole of CH3COONa+1 mole of acetic acid per litre is:
A
pH1:pH2::2:5
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
pH1:pH2::1:2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
pH1:pH2::2:3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
none of these
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is CpH1:pH2::1:2 CH3COONa+HCl⟶CH3COOH+NaCl
[CH3COOH]=[CH3COONa]=1mol/L
pH for weak acid =−log√KaC=12[pKa+logC]=12[pKa+log1]=pKa2(1)
1mole of CH3COONa+1mole of acetic acid for a buffer solution.
pH of this buffer =pKa+log[CH3COONa][CH3COOH]=pKa+log1=pKa(2)