Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Part A Calculate the pH of a solution containing a caffeine conc…
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Question “Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Part A Calculate the pH of a solution containing a caffeine conc…”
Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4.
Part A
Calculate the pH of a solution containing a caffeine
concentration of 281 mgL−1 .
Express your answer to one decimal place.
Answer
281x103g = 1.45x10mol/L 194. 19 Almol = 1.45X10 m Il Cg Hio NG O2 + H2O – Co HiO NGO2H + oH 1.45x152m (initial) 145X10%(1x) 1.45×16% 1.45X10% Kb = 61.45x10XX) (1.45% 10%) = 145 X 103×2 1.45×10? (14) 1-821 8? – 3.98×10″ = 2.758108 X = (2.75* 108)% = 1658×1024 Fort] = 1.45X 10% = 1.45X 10?x1.658×10 WM = 2.40X10 PM Since POH = -logo con ] = -logo (2.40X109) = 6.62 As we know; PHAPO = 14 PH = 14-POH = 14-6.62 = 7.38 – 7.4 [one decimal – place 14SX 10-3
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