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TESTING FOR ACIDS AND BASES (GRADE 7)


The word 'acid' comes from a Latin word 'acidus', which means 'sour'. Acids have a sour taste whereas bases are bitter in taste.

It is not safe to taste every substance to find out if it is acidic or basic. There are some special substances that have different colours in acidic and basic mediums. They are called acid- base indicators. They can be used to test if a substance is acidic or basic.

In the laboratory, two types of litmus papers are available- blue and red. These are used to test acids and bases respectively. An acid turns blue litmus red. A base turns red litmus blue.


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