please help! Consider how to prepare a buffer solution with pH = 3.28 (using one of the weak acid/conjugate base systems

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please help!
Consider how to prepare a buffer solution with pH= 3.28 (using one of the weakacid/conjugate base systems shown here) bycombining 1.00 L ofa 0.485-M solution of weak acidwith 0.217 M sodiumhydroxide.
HNO2
NO2-
4.5 x 10-4
3.35
HClO
ClO-
3.5 x 10-8
7.46
HCN
CN-
4.0 x 10-10
9.40
How many L of the sodiumhydroxide solution would have to be added to the acidsolution of your choice?
Consider how best to prepare one liter of a buffer solution withpH = 3.44 using one of the weakacid/conjugate base systems shown here.
HC2O4-
C2O42-
6.4 x 10-5
4.19
H2PO4-
HPO42-
6.2 x 10-8
7.21
HCO3-
CO32-
4.8 x 10-11
10.32
How many grams of the potassium salt ofthe weak acid must be combined with how many grams ofthe potassium salt of its conjugatebase, to produce 1.00 L of a buffer thatis 1.00 M in the weak base?grams potassium salt of weak acid= grams potassium salt of conjugate base=