The wrong statement among the following is (1) Buffer...

Name: Problem 89, Chapter 7: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-01-21T11:10:47-08:00
Duration: 23 s
Channel: Hunza Gilgit
Description: The wrong statement among the following is (1) Buffer solutions have reserve pII (2) An acidic buffer mixturc can be prepared by mixing a solution of formic acid and sodium formate (3) Buffer solution resist the change in pII by the addition of an acid or base (4) addition of sodium acetate to a buffer solution of sodium acetate and acetic acid does not affect its pII

The wrong statement among the following is (1) Buffer solutions have reserve pII (2) An acidic buffer mixturc can be prepared by mixing a solution of formic acid and sodium formate (3) Buffer solution resist the change in pII by the addition of an acid or base (4) addition of sodium acetate to a buffer solution of sodium acetate and acetic acid does not affect its pII

The wrong statement among the following is
(1) Buffer solutions have reserve pII
(2) An acidic buffer mixturc can be prepared by mixing a solution of formic acid and sodium formate
(3) Buffer solution resist the change in pII by the addition of an acid or base
(4) addition of sodium acetate to a buffer solution of sodium acetate and acetic acid does not affect its pII

Key Concepts

Common-Ion Effect

The common-ion effect describes how the addition of an ion, which is a constituent of an equilibrium system, can shift the position of the equilibrium. In the context of buffer solutions, adding more of one component (either the weak acid or its conjugate base) can change the ratio between them, thereby altering the pH and partially overcoming the buffer's capacity to stabilize the pH.

Henderson-Hasselbalch Equation

The Henderson-Hasselbalch equation is a mathematical relationship that relates the pH of a buffer solution to the pKa of the weak acid and the ratio of the concentrations of its conjugate base and acid. This equation is instrumental in predicting how changes in the ratio of the two components impact the pH.

Buffer Solutions

Buffer solutions are systems that consist of a weak acid and its conjugate base or a weak base and its conjugate acid. They are designed to resist changes in pH when small amounts of acid or base are added. This resistance is due to the equilibrium between the acid and conjugate base which can neutralize added H+ or OH– ions, maintaining the overall pH of the solution.

Buffer Capacity

Buffer capacity refers to the quantitative measure of a buffer’s ability to minimize pH changes upon the addition of acids or bases. It depends on the absolute concentrations of the buffering species; higher concentrations provide a greater capacity to neutralize added acids or bases.

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