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Acids, Bases and Salts — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAcids, Bases and Salts2 Marks
Question
What do you understand by an alkali? Give two examples of:
(a) strong alkalis
(b) weak alkalis
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Answer

An alkali is a basic hydroxide which when dissolved in water produces hydroxyl ions $(OH^-)$ as the only negatively charged ions.
(a) Strong alkalis: Sodium hydroxide , Potassium hydroxide
(b) Weak alkalis: Calcium hydroxide , Ammonium hydroxide

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