A person tests the nature of given acid with a litmus paper but the colour of the paper
doesn't changes. what could have happened? Also explain by giving one example.
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1
Answer:
Dry ammonia does not liberate any ions like OH
−
as it is not in contact with water, thereby has no action on litmus paper.
Ammonia solution in water turns red litmus blue as it forms Ammonium ion(NH
4
+
) and hydroxyl ion(OH
−
).
NH
3
+H
2
O→NH
4
+
+OH
−
Thus, here ammonia act as a base by liberating OH
−
ion. Thus it turns red litmus paper blue.
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