How many moles of \( \mathrm{HCOONa} \) must be added to \( 1 \math...

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How many moles of \( \mathrm{HCOONa} \) must be added to \( 1 \mathrm{~L} \)
P of \( 0.1 \mathrm{M} \mathrm{HCOOH} \) to prepare a buffer solution with

W a \( \mathrm{pH} \) of 3.4 ? (Given: \( \mathrm{K}_{\mathrm{a}} \) for \( \mathrm{HCOOH}=2 \times 10^{-4} \) )
(1) 0.01
(2) 0.05
(3) 0.1
(4) 0.2
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