Question

34.(i) Three solutions A, B and C have pH equal to 1, 3 and 8 respectively. (5)
(a) Which solution has the highest number of Hions?
(b) Which solution has the least number of Hions?
(ii) Bleaching powder is a yellowish white powder which is used for disinfecting
drinking water. How is it manufactured? Write the chemical equation for the reaction
involved. What happens when it is left exposed to air?​

Answer 1

Answer:

According to the theory on a pH scale, a more acidic substance is assigned a lower value. Normally substances with pH less than 7 are considered as acidic and those with pH greater than 7 are considered as basic with acidic strength increasing as we move towards 1 from 7 and the basic strength increases as we move toward 14 from 7. The more the acidic a substance is the more the hydrogen ions concentration.

Hence, in the given solutions, solution A has more hydrogen ions concentration as it is having the least pH value out of the three.

The nature of each solution is:

Solution A-acidic

Solution B- basic

Solution C- basic

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