Question:
Why is K_a2 << K_a1 for H₂SO₄ in water?

Answer:

It can be noticed that K_a1 >> K_a2

This is because a neutral H₂SO₄ has a much higher tendency to lose a proton than the negatively charged HSO₄^- . Thus, the former is a much stronger acid than the latter.

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Question:
Why is K_a2 << K_a1 for H₂SO₄ in water?