Please Answer ALL. Thanks. 27. Which one of the following statements best descri

Question

Please Answer ALL.

Thanks.

27. Which one of the following statements best describes the approximate equivalence point pH in a titration between ammonia (in a conical flask) and hydrochloric acid (in a burette) and why it occurs? A. The equivalence point of the titration will be acidic because at the equivalence point there is a slight excess of the strong acid, hydrochloric acid, present B. The equivalence point of the titration will be alkaline because at the equivalence point there is a slight excess of the weak base, ammonia, present C. The equivalence point of the titration will be acidic because at the equivalence point the ammonium ions react with water to produce a small amount of hydronium ion in solution D. The equivalence point of the titration will be alkaline because at the equivalence point the ammonium ions react with water to produce a small amount of ammonia, a base, in solution E. The equivalence point of the titration will be neutral

Explanation / Answer

Ans 27. C . The equivalence point of the titration will be acidic because at the equivalence point the ammonium ions react with water to produce hydronium ions in the solution .

The titration reaction is given as

NH3 + HCl = NH4+ + Cl-

At equivalence the pH suddenly drops , and methyl orange changes from its basic to acidic colour , as conjugate acid (ammonium ions) react with water to form hydronium ions in the solution :

NH4+ + H2O = NH3 + H3O+

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