174 The drawing (Figure 1) represents a buffer composed of equal concentrations

Question

174

The drawing (Figure 1) represents a buffer composed of equal concentrations of a weak acid, HX, and its conjugate base, X?. The heights of the columns are proportional to the concentrations of the components of the buffer.

a) Which of the three drawings (1), (2), (3) represents the buffer after the addition of a strong acid? Why?

b) Which of the three represents the buffer after the addition of a strong base? Why?

c) Which of the three represents a situation that cannot arise from the addition of either an acid or a base? Why?

Explanation / Answer

HX = X-

a)

after adding strong acid... there will be more HX formation, therefore, expect the column of HX to increase, this is 3

b)

after adding a strong base, there will be neutralization of HX, decreasing HX, therefore HX column got to decrease, choose 1

c)

if you add either acid or base, the HX:X- ratio will change, this must be 2

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