cvrlxzzz3850 cvrlxzzz3850
  • 23-10-2020
  • Chemistry
contestada

What is the buffer component ratio, (NO2-)/(HNO2) of a nitrite buffer that has a pH of 3.47. Ka of HNO2 is 7.1 x 10-4.

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jufsanabriasa
jufsanabriasa jufsanabriasa
  • 24-10-2020

Answer:

The ratio (NO2-)/(HNO2) is 2.094

Explanation:

Using H-H equation for nitrite-nitrous acid buffer:

pH = pKa + log [NO2-] / [HNO2]

Where pH is 3.47

pKa is -log Ka = 3.149

3.47 = 3.149 + log [NO2-] / [HNO2]

0.321 = log [NO2-] / [HNO2]

10^0.321 = [NO2-] / [HNO2]

2.094 = [NO2-] / [HNO2]

The ratio (NO2-)/(HNO2) is 2.094

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