NEET · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
Phosphoric acid ionizes in three steps with their ionization constant values \(K_{a_1}, K_{a_2}\) and \(K_{a_3}\), respectively,
While K is the overall ionization constant.
Which of the following statements are true?
A. \(\log K =\log K _{ a _1}+\log K _{ a _2}+\log K _{ a _3}\)
B. \(H _3 PO _4\) is a stronger acid than \(H _2 PO _4^{-}\)and \(HPO _4^{2-}\)
C. \(K_{a_1}>K_{a_2}>K_{a_3}\)
D. \(K_{a_1}=\frac{K_{a_3}+K_{a_2}}{2}\)
- A A and B only
- B A and C only
- C B, C and D only
- D A, B and C only
Answer & Solution
Correct Answer
(D) A, B and C only
Step-by-step Solution
Detailed explanation
For polybasic acid, order of ionization constant is \(Ka _1> Ka _2> Ka _3\) because as negative charge increases, tendency to loose \(H ^{+}\)ions decreases.
Overall \(K = Ka _1 \times Ka _2 \times Ka _3\)
Taking log on both sides
\(\log K=\log K a_1+\log K a_2+\log K a_3\)
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