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What is meant by strong bases and weak bases?

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What is meant by strong bases and weak bases? Classify the following into strong bases and weak bases:

NH4OH, Ca(OH)2, NaOH, KOH, Mg(OH)2

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Strong base: A base which completely ionises in water and produces a large amount of hydroxide ions.

Weak base: A base which is partially ionised in water and produces a small amount of hydroxide ions.

Strong bases: NaOH, KOH

Weak bases: NH4OH, Ca(OH)2, Mg(OH)2

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