chemistry (buffers)

How can weak acid nitrous acid HNO2 form a buffer solution with equal concentrations and volumes with weak base NH3?

I thought that buffer solutions only occured between weak acids and strong bases or vice versa. The example above as two weak soltuions.

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asked by mike
  1. Buffers are combinations of a weak acid and a weak base, not a weak acid and a strong base.

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    posted by GK

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