Consider the pKa values provided below: HF= 3.5 HClO= 7.5 HCN= 9.3 HNO 2 = 2.3 W

Question

Consider the pKa values provided below:

HF= 3.5

HClO= 7.5

HCN= 9.3

HNO2= 2.3

Which one of the following places 0.1 M aqueous solutions of these acids in order of increasing [H3O+]?

A) HF < HClO < HCN < HNO2

B) HNO2 < HF < HClO < HCN

C) HCN < HClO < HF< HNO2

D) HClO < HCN < HF < HNO2

please show with steps!

Consider the pKa values provided below:

HF= 3.5

HClO= 7.5

HCN= 9.3

HNO2= 2.3

Which one of the following places 0.1 M aqueous solutions of these acids in order of increasing [H3O+]?

Explanation / Answer

[H3O]+ means [H]+   

pKa = - log[H+]

so higher the pKa lower the [H3O]+

Hence the right order is   HCN < HClO < HF < HNO2

therefore

Ans ) C

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