Buffer is an aqueous solution that can withstand the remarkable change in the level of the pH against the addition amount of alkali or acid. acidic buffer and Alkaline buffer are two types of buffer solution.
“A buffer solution is a mixture of a weak acid and its conjugate alkali, or vice versa.” when small amount of acid or alkali are added to the buffer solution, its pH level’s barely changed. (Gillespie, 2018).
Alka seltzer is s buffer solution because it contains both the weak acid which is Citric acid and its salt (sodium citrate).Hence, it acts to keep the H3o+ ion concentration and consequently , the pH level constant . If we add acid such as hydrochloric acid , the equilibrium shift to the left hand side based on the le chatelier’s principle and most of the hydronium ions from the hydrochloric acid will combine with citrate ions , forming citric acid molecules. Thus, there is a slightly increase in the concentration of hydronium ion, and the pH remains practically unchanged.
(Rice university, 2018)


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