Part A Which acid in each of the following pairs has the stronger conjugate base? Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. ResetHelp Of the acids HCl or HF, the one with the stronger conjugate base is Of the acids H C l or H F, the one with the stronger conjugate base is blank.. Of the acids H2S or HNO2 , the one with the stronger conjugate base is Of the acids H 2 S or H N O 2 , the one with the stronger conjugate base is blank.. Of the acids H2CO3 or HClO4 , the one with the stronger conjugate base is Of the acids H 2 C O 3 or H C l O 4 , the one with the stronger conjugate base is blank.. Of the acids HF or NH4+, the one with the stronger conjugate base is Of the acids H F or N H 4 +, the one with the stronger conjugate base is blank..

According to Bronsted-Lowry acid-base theory, the weaker an acid, the stronger its conjugate acid. Especially for weak acids, pKa gives information about the strength of such acid. The higher the pKa, the weaker the acid.

Of the acids HCl or HF, the one with the stronger conjugate base is HF because it is a weak acid.

Of the acids H₂S or HNO₂, the one with the stronger conjugate base is H₂S because it is a weaker acid. pKa (H₂S) = 7.04 > pKa (HNO₂) = 3.39

Of the acids H₂CO₃ or HClO₄, the one with the stronger conjugate base is H₂CO₃ because it is a weak acid.

Of the acids HF or NH₄⁺, the one with the stronger conjugate base is NH₄⁺ because it is a weaker acid. pKa (HF) = 3.17 < pKa (NH₄⁺) = 9.25