Problem: Which of the following is the weakest acid?A.  HF (KA for HF is 7.2 x 10-4)B.  H3BO3 (Ka for H3BO3 is 5.4 x 10 -10)C.  HCNO (ka for HCNO is 2 x 10-4)D.  HCN (ka for HCN is 4.9 x 10-10)

FREE Expert Solution

For this problem, we are asked which is the weakest acid. 

  • For a weak acid HA, the acid-base reaction will appear as:

HA (aq) + H2O (l) ⇌ H3O+ (aq) + A- (aq)

  • Ka expressions can be written as:

Ka = [H+][A-][HA]


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Problem Details

Which of the following is the weakest acid?

A.  HF (KA for HF is 7.2 x 10-4)

B.  H3BO(Ka for H3BO3 is 5.4 x 10 -10)

C.  HCNO (ka for HCNO is 2 x 10-4)

D.  HCN (ka for HCN is 4.9 x 10-10)

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Our tutors have indicated that to solve this problem you will need to apply the Identifying Acids and Bases concept. You can view video lessons to learn Identifying Acids and Bases. Or if you need more Identifying Acids and Bases practice, you can also practice Identifying Acids and Bases practice problems.