İl See Periodic Table O See Hint A 100 L solution contains 2132 of nitrous acid,...

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Answer 1

Answer #1

mixtureof HNO2 and NaNO2 act as acidic buffer

for such buffer

pH = pKa + log [NaNO2] / [HNO2]

pH = 3.26

[HNO2] = (21.52 / 47) (1/1) = 0.458 M

pKa = - log Ka = - log 4.0 x 10^-4 = 3.40

[NaNO2] = ?

3.26 = 3.40 + log [NaNO2] / [0.458]

- 0.14 = log [NaNO2] + 0.34

- 0.48 = log [NaNO2]

[NaNO2] = 0.331 M

now

0.331 = (W / 69) (1 / 1)

W = 22.84 g

mass of NaNO2 required = 22.84 g

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Answer 2

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