Question

For the dissociation of formic acid, acetic acid and carbonic acid the value of $ p{{K}_{a}} $ is 3.62, 4.74 and 6.3 respectively. Which of the following statement is correct?

• A. Formic acid is the strongest acid
• B. Acetic acid is the weakest acid
• C. Carbonic acid is the strongest acid
• D. Acetic acid is weaker than carbonic acid

Answer 1

Answer: (A)

On decreasing the $ p{{K}_{a}} $ value, acidic strength increases, ie, smaller the value of $ p{{K}_{a}}, $ stronger the acid is. Hence, formic acid is the strongest acid.