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The first and second dissociation constants of an acid H2A are 1.0 × 10−5 and 5 × 10−10, respectively. What is the overall dissociation constant of the acid?
  • a)
    0.2 × 105
  • b)
    5.0 × 10-5
  • c)
    5.0 × 1015
  • d)
    5.0 × 10-15
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
The first and second dissociation constants of an acid H2A are 1.0 × ...

Overall Dissociation Constant of Acid H2A

Given Information:
- First dissociation constant (Ka1) = 1.0 × 10^-5
- Second dissociation constant (Ka2) = 5 × 10^-10

Calculating Overall Dissociation Constant:
- The overall dissociation constant for the acid H2A can be calculated using the given dissociation constants.

- For the acid H2A, the first dissociation reaction is: H2A → HA^- + H^+
- The equilibrium constant for this reaction is given by: Ka1 = [HA^-][H^+]/[H2A]

- For the acid HA^-, the second dissociation reaction is: HA^- → A^2- + H^+
- The equilibrium constant for this reaction is given by: Ka2 = [A^2-][H^+]/[HA^-]

- The overall dissociation constant (Koverall) is given by the product of the individual dissociation constants: Koverall = Ka1 * Ka2

Calculation:
- Koverall = (1.0 × 10^-5) * (5 × 10^-10)
- Koverall = 5.0 × 10^-15

Therefore, the overall dissociation constant of the acid H2A is 5.0 × 10^-15, which corresponds to option 'D'.
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Community Answer
The first and second dissociation constants of an acid H2A are 1.0 × ...
First step dissociation reaction
Second step dissociation reaction:
Overall reaction:
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The first and second dissociation constants of an acid H2A are 1.0 × 10−5 and 5 × 10−10, respectively. What is the overall dissociation constant of the acid?a)0.2 × 105b)5.0 × 10-5c)5.0 × 1015d)5.0 × 10-15Correct answer is option 'D'. Can you explain this answer?
Question Description
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