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5.52 g of nitrous acid HNO2 is added to water to make a final solution of 444 ml What is the pH of the solution?
Wiki User
∙ 16y ago
HNO2 molar mass : 47 g.mol-1 5,52g = 0.1174 mol c0= [HNO2]0=0.265mol.L-1 pKaHNO2=3.3 Ka/c0=1,9.10-3 is small so we are allowed to approximate at [H3O+]eq~(Ka*c0)1/2 (for more explanation see Ostwald's law of dilution). pH~1/2*pKa-1/2*log10c0=1,94
Wiki User
∙ 16y ago
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What is the molarity of a nitrous acid solution prepared by adding 245 mL of water to 625 mL of 5.7M nitrous acid?
625 ml of nitrous acid contains 3,5625 moles (0,625*5,7) The total volume increases from 625 to 870 (625+245) 3,5625/0,87=4,09 M
