A substance is added to water and the pH of the water increases from 7.5 to 8.5.
ID: 1028649 • Letter: A
Question
A substance is added to water and the pH of the water increases from 7.5 to 8.5. Which of the following statements is NOT true?Select one: a. Proton concentration decreased. b. The solution became more basic. c. Hydroxide reacted with hydrogen ions to produce water. d. Hydroxide ion concentration increased. e. Hydrogen ion concentration increased. A substance is added to water and the pH of the water increases from 7.5 to 8.5. Which of the following statements is NOT true?
Select one: a. Proton concentration decreased. b. The solution became more basic. c. Hydroxide reacted with hydrogen ions to produce water. d. Hydroxide ion concentration increased. e. Hydrogen ion concentration increased. A substance is added to water and the pH of the water increases from 7.5 to 8.5. Which of the following statements is NOT true?
Select one: a. Proton concentration decreased. b. The solution became more basic. c. Hydroxide reacted with hydrogen ions to produce water. d. Hydroxide ion concentration increased. e. Hydrogen ion concentration increased.
Explanation / Answer
Correct Answer:
e. Hydrogen ion concentration increased.
Substance is added to water. There is equal number of Hydrogen ion and Hydroxide ion are present before addition of substance due to auto ionization of water, although it is negiligible at STP.
pH increases means definitely Hydrogen ion concentration decreases. Hence e. Hydrogen ion concentration increased is not true.
The correct statements are:
a. Proton concentration decreased.
b. The solution became more basic.
c. Hydroxide reacted with hydrogen ions to produce water.
d. Hydroxide ion concentration increased.
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