Problem: Which is a stronger base, S2 -  or Se2-?

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We are asked which is the stronger base, S2- or Se2-.

The conjugate base of an acid is the species formed after an acid donates a proton. The general reaction is as follows:

                                  Acid + Base  Conjugate Base + Conjugate Acid

The strengths of conjugate bases of binary acids are based on the electronegativity of the nonmetal in the binary acid. 

conjugate base is considered stronger when its binary acid is weaker. 


S2-              Se2-            

The binary acids counterparts are:

   H2S               H2Se

The reaction forming the conjugate bases are:

  H2S +H2 H3O+ + S2-

  H2Se + H2 H3O+ + Se2-

We’ll rank their strength based on the electronegativity of the nonmetal in each binary acid.

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Problem Details

Which is a stronger base, S2 -  or Se2-?

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What scientific concept do you need to know in order to solve this problem?

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.

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Based on our data, we think this problem is relevant for Professor Randles' class at UCF.