00 Ph
How many millimoles of HX (pKa = 2.00) are required to make 250. mL of a solution with a pH of 2.20? ?
How many millimoles of HX (pKa = 2.00) are required to make 250. mL of a solution with a pH of 2.20?
H+ = 10^-2.20 = 0.0063 M = X-
Ka = 0.01 = ( 0.0063)^2 / x – 0.0063
0.01 x – 0.000063 = 0.000040
x = 0.0103 M = concentration HX
moles = 0.0103 x 0.250 L = 0.00258
mmoles = 2.58
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Moisiture & PH meters | adminbr November 1, 2003