3. Why do soaps and toothpastes contain a base? (Hint: Bases neutralise acids.)
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When an acid and a base reacts, you get water and salt.
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. toothpaste contains base because toothpaste is used for cleaning out teeth.
.we eat food so it gets acidic and stick to our teeth
.so toothpaste contain base to react with the acids present in teeth to form salt and water.
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