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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be: [NEET Kar. 2013]
  • a)
    2.8 × 10–4
  • b)
    1.4 × 10–5
  • c)
    1.4 × 10–4
  • d)
    3.7 × 10–4
Correct answer is option 'C'. Can you explain this answer?
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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues lea...
Degree of dissociation, α = 3.7 = 0.037

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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues lea...
The dissociation of lactic acid can be represented as:

HC3H5O3 ⇌ H+ + C3H5O3-

The dissociation constant expression for this reaction is:

Ka = [H+][C3H5O3-]/[HC3H5O3]

At equilibrium, if x is the amount of lactic acid dissociated, then the concentration of H+ and C3H5O3- ions will also be x. Therefore, the concentration of undissociated lactic acid will be (0.10 - x). Using the given percentage of dissociation, we can write:

% dissociation = (x/[HC3H5O3]) x 100
3.7 = (x/0.10) x 100
x = 0.0037 M

Substituting these values in the expression for Ka, we get:

Ka = (0.0037 x 0.0037)/(0.10 - 0.0037)
Ka = 1.4 x 10^-4

Therefore, the value of dissociation constant, Ka, for lactic acid is 1.4 x 10^-4. The correct option is not given in the question.
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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues lea...
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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be: [NEET Kar. 2013]a)2.8 × 10–4b)1.4 × 10–5c)1.4 × 10–4d)3.7 × 10–4Correct answer is option 'C'. Can you explain this answer?
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Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be: [NEET Kar. 2013]a)2.8 × 10–4b)1.4 × 10–5c)1.4 × 10–4d)3.7 × 10–4Correct answer is option 'C'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be: [NEET Kar. 2013]a)2.8 × 10–4b)1.4 × 10–5c)1.4 × 10–4d)3.7 × 10–4Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Accumulation of lactic acid (HC3H5O3), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociated. The value of dissociation constant, Ka, for this acid will be: [NEET Kar. 2013]a)2.8 × 10–4b)1.4 × 10–5c)1.4 × 10–4d)3.7 × 10–4Correct answer is option 'C'. Can you explain this answer?.
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