what mass of HClO4 should be present in .5L of solution toobtain a solution with

Question

what mass of HClO4 should be present in .5L of solution toobtain a solution with each of the following pH values? pH= 2.50 pH=.50 what mass of HClO4 should be present in .5L of solution toobtain a solution with each of the following pH values? pH= 2.50 pH=.50

Explanation / Answer

pH = 2.50 => [H+] = 10-2.50 = 0.00316M B/c HClO4 is a strong acid, all dissolved HClO4 will ionize toH+ 0.5 L *0.00316 mol H+/L *(1mol HClO4/1mol H+) *(100.46 g/molHClO4) = 0.159 grams ================== for pH = 0.50; [H+] = 10-.5 = 0.316 M 0.5 L *0.316 mol H+/L *(1mol HClO4/1mol H+) *(100.46 g/molHClO4) = 15.9 grams

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