Question

1.A lactic acid/lactate ion buffer solution contains 0.43 M HC3H5O3 and 0.62 M C3H5O3−, respectively. The...

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.

Homework Answers

Answer #1

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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