Which of the following statement is false?
Correct answer: A. If 1 M CH3COONa is added to 1 M CH3COOH, pH of the solution decreases
- A. If 1 M CH3COONa is added to 1 M CH3COOH, pH of the solution decreases
- B. If water is added to a mixture of CH3COOH + CH3COONa its pH remains constant
- C. If HCI is added to acetic acid its ionization will be suppressed
- D. If a crystal of NH4CI is added to NH4OH solution its pH decreases
Explanation
Option A is correct. When you add sodium acetate (CH3COONa) to acetic acid (CH3COOH), it forms a buffer solution, which resists significant changes in pH. The pH of a buffer solution remains relatively constant when small amounts of acid or base are added. In this case, the pH may change slightly, but it won't decrease significantly. The buffer capacity of the solution helps maintain a relatively stable pH.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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