Question

5 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​

Answer 1

Strong bases is compound that ionizes completely to give large amount of OH  

−

 ions in aqueous solution. Weak bases is compound that do not ionize completely and gives few OH  

−

 ions in aqueous solution.

Here, NH  

4

​  

OH⇒ Weak base.

Ca(OH)  

2

​  

,NaOH,KOH⇒ Strong base

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Answer 2

strong bases ionise completely in water, producing huge amount of hydroxide ions (H ion) . Generally basic or alkali solution of ph 8,9 and 10 are considered weak bases or alkalis. Weak bases ionise partially in water, producing less amount of hydroxide ions (H ion).

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