Asked Feb 14, 2020

Which is a stronger acid, H2O or H2S?


Expert Answer

Step 1

According to Arrhenius theory an acid is the substance which gives H+ ions when dissolved in water.

The structures of given molecules is as shown below:

Chemistry homework question answer, step 1, image 1


Step 2

Atomic radius of the  anionic atom is one of the factor which influences the acidity of the substance.

Both oxygen and sulfur belong to the same group that is VIA group of the periodic table.

As we go down from top to bottom of the periodic table, atomic size increases.

So, sulfur atomic size is larger than oxygen.

Due to  its small size O-H bond is stronger than S-H bond.

The bond distance in H2O and H2S is as shown below:

Chemistry homework question answer, step 2, image 1and Chemistry homework question answer, step 2, image 2

So, S-H bond breaks easily than O-H bond and releases H+ ion more rapid...

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