Buffer solutions are mostly prepared by mixing:
Correct answer: C. Two substances
- A. Three substances
- B. Four substances
- C. Two substances
- D. Five substances
Explanation
Buffer solutions are prepared by mixing a weak acid and its corresponding conjugate base (or a weak base and its corresponding conjugate acid) in relatively equal amounts. This combination helps to maintain a stable pH when small amounts of an acid or a base are added to the solution. Thus, C is the correct option.
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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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