1 A student added some sulfuric acid gradually to a solution of ammonia until it was in excess. What happens to the pH during this reaction? A pH of ammonia at start: 11 pH after excess sulfuric acid: 7 B pH of ammonia at start: 7 pH after excess sulfuric acid: 13 c pH of ammonia at start 11 pH after excess sulfuric acid . . D pH of ammonia at start: 3 pH after excess sulfuric acid: 8

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1 A student added some sulfuric acid gradually to a solution of ammonia until it was in excess. What happens to the pH during this reaction? A pH of ammonia at start: 11 pH after excess sulfuric acid: 7 B pH of ammonia at start: 7 pH after excess sulfuric acid: 13 c pH of ammonia at start 11 pH after excess sulfuric acid . . D pH of ammonia at start: 3 pH after excess sulfuric acid: 8

Answer 1

The correct answer is A.When sulfuric acid is added to a solution of ammonia, it reacts with the ammonia to form ammonium sulfate. This reaction is an acid-base reaction, where sulfuric acid (a strong acid) reacts with ammonia (a weak base). As the sulfuric acid is added in excess, the pH of the solution decreases, making it more acidic. Therefore, the pH of the solution will decrease from the initial pH of ammonia to a lower value after the addition of excess sulfuric acid.

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