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The first and second dissociation constants of an acid H2A are 1.0 × 10-5 and 5.0 × 10-10 respectively.
The overall dissociation constant of the acid will be:
- a)5.0×10-5
- b)5.0×1015
- c)5.0×10-15
- d)0.2×105
Correct answer is option 'C'. Can you explain this answer?
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The first and second dissociation constants of an acid H2A are 1.0 ...
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Overall Dissociation Constant of Acid H2A:
To find the overall dissociation constant of the acid H2A, we need to consider the dissociation constants of its first and second ionization steps. The acid H2A can donate two protons, so it can undergo two dissociation steps:
1. First dissociation step:
H2A ⇌ H+ + HA-
Dissociation constant (Ka1) = [H+][HA-]/[H2A]
2. Second dissociation step:
HA- ⇌ H+ + A2-
Dissociation constant (Ka2) = [H+][A2-]/[HA-]
Relationship between Dissociation Constants:
The overall dissociation constant (Ka) of the acid H2A is related to its first and second dissociation constants (Ka1 and Ka2) as follows:
Ka = Ka1 * Ka2
Given Information:
The first dissociation constant (Ka1) of the acid H2A is given as 1.0 * 10^(-5).
The second dissociation constant (Ka2) of the acid H2A is given as 5.0 * 10^(-10).
Calculating the Overall Dissociation Constant:
Using the relationship between dissociation constants, we can calculate the overall dissociation constant (Ka) as follows:
Ka = Ka1 * Ka2
= (1.0 * 10^(-5)) * (5.0 * 10^(-10))
= 5.0 * 10^(-15)
Conclusion:
The overall dissociation constant (Ka) of the acid H2A is 5.0 * 10^(-15), which corresponds to option 'C'.
To find the overall dissociation constant of the acid H2A, we need to consider the dissociation constants of its first and second ionization steps. The acid H2A can donate two protons, so it can undergo two dissociation steps:
1. First dissociation step:
H2A ⇌ H+ + HA-
Dissociation constant (Ka1) = [H+][HA-]/[H2A]
2. Second dissociation step:
HA- ⇌ H+ + A2-
Dissociation constant (Ka2) = [H+][A2-]/[HA-]
Relationship between Dissociation Constants:
The overall dissociation constant (Ka) of the acid H2A is related to its first and second dissociation constants (Ka1 and Ka2) as follows:
Ka = Ka1 * Ka2
Given Information:
The first dissociation constant (Ka1) of the acid H2A is given as 1.0 * 10^(-5).
The second dissociation constant (Ka2) of the acid H2A is given as 5.0 * 10^(-10).
Calculating the Overall Dissociation Constant:
Using the relationship between dissociation constants, we can calculate the overall dissociation constant (Ka) as follows:
Ka = Ka1 * Ka2
= (1.0 * 10^(-5)) * (5.0 * 10^(-10))
= 5.0 * 10^(-15)
Conclusion:
The overall dissociation constant (Ka) of the acid H2A is 5.0 * 10^(-15), which corresponds to option 'C'.
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The first and second dissociation constants of an acid H2A are 1.0 × 10-5and 5.0 × 10-10respectively.The overall dissociation constant of the acid will be:a)5.0×10-5b)5.0×1015c)5.0×10-15d)0.2×105Correct answer is option 'C'. Can you explain this answer?
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