Chemistry Practice Problems Ka and Kb Practice Problems Solution: Given the Ka values (in parentheses) for the follo...

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Solution: Given the Ka values (in parentheses) for the following acids: HCl (Ka is very large) HNO2 (Ka = 4.0 x 10 –4 ); HF (Ka = 7.2 x 10 –4 ) CH3COOH (Ka = 1.8 x 10 –5 ) HCN (Ka = 6.2 x 10 –10) C6H5COOH (Ka = 6.3 x 10 –5 ) Rank (or list) these acids in order of decreasing strength (strongest first). A. HCl > HF > HNO2 > C6H5COOH > CH3COOH > HCN B. HCl > HF > HNO2 > CH3COOH > C6H5COOH > HCN C. HCN > CH3COOH > C6H5COOH > HNO2 > HF > HCl D. HCl > HNO2 > HF > CH3COOH > C6H5COOH > HCN E. HCN > C6H5COOH > CH3COOH > HF > HNO2 > HCl

Problem

Given the Ka values (in parentheses) for the following acids:

HCl (Ka is very large)

HNO2 (Ka = 4.0 x 10 –4 );

HF (Ka = 7.2 x 10 –4 )

CH3COOH (Ka = 1.8 x 10 –5 )

HCN (Ka = 6.2 x 10 –10)

C6H5COOH (Ka = 6.3 x 10 –5 )

Rank (or list) these acids in order of decreasing strength (strongest first).

A. HCl > HF > HNO2 > C6H5COOH > CH3COOH > HCN

B. HCl > HF > HNO2 > CH3COOH > C6H5COOH > HCN

C. HCN > CH3COOH > C6H5COOH > HNO2 > HF > HCl

D. HCl > HNO2 > HF > CH3COOH > C6H5COOH > HCN

E. HCN > C6H5COOH > CH3COOH > HF > HNO2 > HCl