Ionic EquilibriumHard
Question
1 M benzoic acid (pKa = 4.20) and 1M C6H5 COONa solutions are given separately. What is the volume of benzoic acid required to prepare a 300 ml buffer solution of pH = 4.5 ? [log 2 = 0.3]
Options
A.200 ml
B.150 ml
C.100 ml
D.50 ml
Solution
pH = pKa + log 
⇒ 4.5 = 4.2 + log 
⇒ 
= 2
∴ volume of C6H5COONa required = V2 = 200 ml
volume of C6H5COOH required = V1 = 100 ml.
⇒ 4.5 = 4.2 + log ⇒ = 2∴ volume of C6H5COONa required = V2 = 200 ml
volume of C6H5COOH required = V1 = 100 ml.
Create a free account to view solution
View Solution FreeMore Ionic Equilibrium Questions
The equilibrium constant for the ionization of RNH2(g) in water as RNH2(g) + H2O(l) $\rightleftharpoons$ RNH3+ (aq) + O...Which of the following salts undergoes anionic hydrolysis?...The solubility of AgCN in a buffer solution of pH = 3.0 is (Ksp of AgCN = 1.2 × 10−16; Ka of HCN = 4.8 × 10−10)...In a buffer solution containing equal concentration of B- and HB, the Kb for B-1 is 10-10 . The pH of buffer solution is...An acid type indicator, HIn differs in colour from its conjugate base (In–). The human eye is sensitive to colour differ...