chem (acid and alkali) MC

CHING WAI

2009-03-25 2:52 am

A: Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
B: Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement
C: The 1st statement is false while the 2nd statement is true
D: Both statements are false.

------------------------------------------------------------------------------------
(1). Statement 1: sodium hydroxide is an active ingredient in anti-acid tables.
Statement 2: soidum hydroxide is a strong alkali

(2). Statement 1: sodium ethanoate is a salt.
Statement 2: ethanoic acid can be found in vinegar

回答 (1)

老爺子

2009-03-25 3:40 am

✔ 最佳答案

(1)
The answer is C.

The first statement is false. An anti-acid is used to neutral excess acid in gastric juice. Sodium hydroxide should not be used as an anti-acid because it is a strong alkali, and thus very corrosive.

The second statement is true.

(2)
The answer is B.

The first statement is true. A salt is a product other than water that formed in neutralization between an acid and an alkali. When sodium hydroxide is neutralized by ethanoic acid, sodium ethanoate is formed.

The second statement is true. Vinegar is a dilute solution of ethanoic acid.

However, the second statement is not an explanation of the first statement.
=

👍 0 👎 0