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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
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Based on our data, we think this problem is relevant for Professor Qin's class at UMASS.