1.A lactic acid/lactate ion buffer solution contains 0.43 M HC3H5O3 and 0.62 M C3H5O3−, respectively. The Ka value of lactic acid is 1.4×10−4. Calculate the pH of this buffer.
2. Enter the formula of the conjugate base for the acid H2PO4−.
Enter the formula of the conjugate base for the acid CH3−NH3+.
Enter the formula of the conjugate base for the acid HSO4−.
Enter the formula of the conjugate base for the acid HNO2.
Enter the formula of the conjugate base for the acid HBrO.
1)
Ka = 1.4 x 10^-4
pKa = -log Ka
pKa = -log (1.4 x 10^-4)
pKa = 3.85
pH = pKa + log [salt / acid]
pH = 3.85 + log (0.62 / 0.43)
pH = 4.01
2)
formula of the conjugate base for the acid H2PO4− -----------------------> HPO4-2
Enter the formula of the conjugate base for the acid CH3−NH3+. ---------------> CH3NH2
Enter the formula of the conjugate base for the acid HSO4−-------------------> SO4-2
Enter the formula of the conjugate base for the acid HNO2 -------------------> NO2-
Enter the formula of the conjugate base for the acid HBrO --------------------> BrO-
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