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An acid and a base are mixed in the right amounts. What is the result?
AA much stronger acid
BA neutral substance
CA much stronger base
DA much purer element
Answer & Solution
Correct answer: B. A neutral substance
1. Acids and bases have chemical properties that are opposite to each other.
2. Mixing them lets each one act against the properties of the other.
3. When the amounts are right, both lose their own characteristics.
4. What is left is neither acidic nor basic, so it is a neutral substance.
5. This cancelling out is called neutralisation.
6. The mixture cannot become a stronger acid, because the base works against it.
7. It cannot become a purer element either, because two substances have reacted.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Bases_
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