You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00  10–4). A buffer of pH 3.000 is neede?

You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00  10–4). A buffer of pH 3.000 is needed. What volumes of HNO2 and KNO2 are required to make 1 liter of buffered solution?
500 mL of each
286 mL HNO2; 714 mL KNO2
413 mL HNO2; 587 mL KNO2
714 mL HNO2; 286 mL KNO2
587 mL HNO2; 413 mL KNO2
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