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Buffer capacity of a buffer is given as two units for a change in pH by Unity. Then what is the number of moles of acid or base, added in one litre of the solution?
- a)2
- b)0.5
- c)1
- d)4
Correct answer is option 'A'. Can you explain this answer?
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Buffer capacity of a buffer is given as two units for a change in pH b...
Buffer capacity is denoted by ? = number of moles of acid or base added to one litre of the buffer by a change in pH. Here the change in pH is given as 1, and the buffer capacity is given as 2, therefore, by substituting, we get that 2 moles of acid or base are added in one litre of the solution.
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Buffer capacity of a buffer is given as two units for a change in pH b...
Understanding Buffer Capacity
Buffer capacity is a measure of the ability of a buffer solution to resist changes in pH when an acid or base is added. It is defined as the amount of acid or base that can be added to a solution without causing a significant change in pH.
Definition of Buffer Capacity
- The buffer capacity (β) is quantitatively expressed as the change in pH (ΔpH) per unit of acid or base added (Δ[H⁺] or Δ[OH⁻]).
- In this case, a buffer capacity of 2 units indicates that for every 1 unit change in pH, 2 moles of acid or base can be added to the solution.
Calculating Moles Added
- If we consider a buffer capacity of 2, it means that to change the pH by 1 unit, 2 moles of either acid or base can be added per liter of solution.
- Therefore, if the change in pH is 1 unit, the effective amount of acid or base that can be added is given by:
- Buffer capacity (β) = moles of acid/base added (n) / change in pH (ΔpH)
- Rearranging gives: n = β × ΔpH
Final Calculation
- Substituting the values:
- n = 2 moles/unit × 1 unit = 2 moles
- Hence, when 2 moles of acid or base are added to one liter of the solution, the pH changes by 1 unit.
Conclusion
- The correct answer is option 'A', which states that 2 moles of acid or base can be added to the buffer solution to change the pH by 1 unit. Understanding this principle is crucial for applications in chemistry and biology, particularly in fields like biochemistry and medicine.
Buffer capacity is a measure of the ability of a buffer solution to resist changes in pH when an acid or base is added. It is defined as the amount of acid or base that can be added to a solution without causing a significant change in pH.
Definition of Buffer Capacity
- The buffer capacity (β) is quantitatively expressed as the change in pH (ΔpH) per unit of acid or base added (Δ[H⁺] or Δ[OH⁻]).
- In this case, a buffer capacity of 2 units indicates that for every 1 unit change in pH, 2 moles of acid or base can be added to the solution.
Calculating Moles Added
- If we consider a buffer capacity of 2, it means that to change the pH by 1 unit, 2 moles of either acid or base can be added per liter of solution.
- Therefore, if the change in pH is 1 unit, the effective amount of acid or base that can be added is given by:
- Buffer capacity (β) = moles of acid/base added (n) / change in pH (ΔpH)
- Rearranging gives: n = β × ΔpH
Final Calculation
- Substituting the values:
- n = 2 moles/unit × 1 unit = 2 moles
- Hence, when 2 moles of acid or base are added to one liter of the solution, the pH changes by 1 unit.
Conclusion
- The correct answer is option 'A', which states that 2 moles of acid or base can be added to the buffer solution to change the pH by 1 unit. Understanding this principle is crucial for applications in chemistry and biology, particularly in fields like biochemistry and medicine.
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Buffer capacity of a buffer is given as two units for a change in pH by Unity. Then what is the number of moles of acid or base, added in one litre of the solution?a)2b)0.5c)1d)4Correct answer is option 'A'. Can you explain this answer?
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