Buffer preparation: A 6.90 g sample of sodium nitrite (NaNO2, 68.995) was dissolved in about 100. mL of water. To this was added 500. mL of 0.200 M nitrous acid (HNO2, pKa = 3.34) and the total volume was brought to 1.00 L by adding distilled water. (hint: calculate the molarites in this buffer solution first) Addition of acid to buffer: To 100.0 mL of this resulting buffer solution was added 1.00 mL of 5.29 M HBr (aq). The pH of the buffer + HBr solution is

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