What is the pH of 5.0756mg barium hydroxide octahydrate in4.6 liters of water, and the pH of 0.19789g dihydrogen sulfate in 374mL of water both are separate and at 25 degrees C with nothing else present, assume no change of volume and or temp.
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Expert's answer
2013-03-13T09:36:20-0400
pH of Ba(OH)2: Barium hydroxide octahydrate consist of barium hydroxide,and it is possible to find mass of last one from mass of first one: 5.0756 mg = 0.0050756 g 0.0050756 m Ba(OH)2*8H2O -------> Ba(OH)2 171+8*18 171 m = 0.0027553g amount is n = m/Mw = 0.0027553/171 = 1.661*10^-5 mol (in 4.6 L) M = amount in 1 L M = 1.661*10^-5 / 4.6 = 3.5 * 10^-6 M Ba(OH)2 <=> 2OH- + Ba2+ [OH-]= 2 M = 7 * 10^-6 pOH = -log [OH-] = 5.155 pH = 14 - pOH = 14 - 5.155 = 8.845
pH of H2SO4: n = m/Mw = 0.19789/98 = 0.00202 mol (in 374 ml) M = 0.00202/0.374 = 0.0054 M [H+] = 2 M = 0.0108 M pH = -log [H+] = 1.97
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