Most acids and alkalis in the laboratory are irritant or even _________.

Use of acids: for food ___________. e.g. cucumber in vinegar

Use of acids: for stain ___________. E.g. Toilet cleaner reacts with dirt and stains in the toilet bowl. The products of the reactions are easily removed when we flush the toilet.

Use of alkalis: for making ___________

Use of alkalis: for ______ _______ by sodium hydroxide in kitchen

The alkaline solution found in Chinese noodle is ___ water.

To preserve cucumber, we use _______.

Toilet cleaner is used to remove stains. It contains ____________ ____.

Bleach is ________.

Yoghurt is ________.