Equilibrium - Result Question 58

####60. The pH value of a 10M solution of HCl is [1995]

(a) less than 0

(b) equal to 0

(c) equal to 1

(d) equal to 2

Topic 4: Ionisation of Weak Acids and Bases and Relation between Ka and Kb

Show Answer

Solution:

  1. (a) Molarity (M)=10M. HCl is a strong acid and it is completely dissociated in aqueous solutions as : HCl(10)→H+(10)+Cl−.

So, for every moles of HCl, there is one H+. Therefore [H+]=[HCl] or [H+]=10.

pH=−log⁡[H+]=−log⁡[10]=−1.

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