# What volumes of 0.200 M HNO_2 and 0.200 M NaNO_2 are required to make 500 mL of a buffer solution with pH =3.00 ? [K_a for HNO_2=4.00xx10^(-4)

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What volumes of 0.200 M HNO_2 and 0.200 M NaNO_2 are required to make 500 mL of a buffer solution with pH =3.00 ? [K_a for HNO_2=4.00xx10^(-4)]
A. 250 mL of each
B. 143 mL of HNO_2 and 357 mL of NaNO_2
C. 200 mL of HNO_2 and 300 mL of NaNO_2
D. 357 mL of HNO_2 and 143 mL of NaNO_2

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