Question

determine van't hoff factor for a tribasic acid H3A assuming first dissociation as 100% second dissociation 50% and third dissociation as 20%

Answer 1

The value of vantt hoff factor is 0.4

Given that:

• H3A is a tribasic acid.
• The first dissociation of the acid = 100%
• The second dissociation of the acid = 50%
• The third dissociation of the acid = 25%

Solution:

H3A ------------> H+(1) +  H2A-(1)

H2A- (1 -0.5)  ------------>  H+ (0.5) + HA-2 (0.5)

HA-2 (0.5 - 0.5 [0.2])    ----------->   H+ (0.1) + A-3 (0.1)

Now calculate the value of van't hoff factor

van't hoff factor (i) = (1 + 0.5 + 0.1 + 0.5 + 0.4 + 0.1)

van't hoff factor = 0.4

Thus, the value of vantt hoff factor is 0.4

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