fill in the blank.
1. The sour things we eat contain ____________________.
2. Ammonium hydroxide is an _______________ .
3. An acid is __________________ by a base .
4. An antacid generally contains a ______________.

1. The sour things we eat contain ___acid_________________. 
2. Ammonium hydroxide is a ___base____________ . 
3. An acid is __neutralised____________ by a base . 
4. An antacid generally contains a __base____________.

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