Chemistry Practice Problems Ka and Kb Practice Problems Solution: Use the acid-dissociation constants in the followi...

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Solution: Use the acid-dissociation constants in the following table to arrange these oxyanions from strongest base to weakest.SO32-, PO42-, SO42-, CO32-NameFormula Ka1  Ka2  Ka3 AscorbicH2C6H6O68.0 x 10-51.6 x10-12;CarbonicH2CO34.3 x 10-75.6 x 10-11;CitricH3C6H5O77.4 x 10-41.7 x 10-54.0 x 10-7OxalicH2C2O45.9 x 10-26.4 x 10-5;PhosphoricH3PO47.5 x 10-36.2 x 10-84.2 x 10-13SulfurousH2SO31.7 x 10-26.4 x10-8;SulfuricH2SO4Large1.2 x10-2;TartaricH2C4H4O61.0x 10-34.6 x10-5;

Problem

Use the acid-dissociation constants in the following table to arrange these oxyanions from strongest base to weakest.

SO32-, PO42-, SO42-, CO32-


NameFormula Ka1  Ka2  Ka3 
AscorbicH2C6H6O68.0 x 10-51.6 x10-12
CarbonicH2CO34.3 x 10-75.6 x 10-11
CitricH3C6H5O77.4 x 10-41.7 x 10-54.0 x 10-7
OxalicH2C2O45.9 x 10-26.4 x 10-5
PhosphoricH3PO47.5 x 10-36.2 x 10-84.2 x 10-13
SulfurousH2SO31.7 x 10-26.4 x10-8
SulfuricH2SO4Large1.2 x10-2
TartaricH2C4H4O61.0x 10-34.6 x10-5



Solution

We are asked to arrange the following oxyanions from the strongest base to weakest using the acid-dissociation constants in the table.

SO32-, PO42-, SO42-, CO32-


The acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution.


For an aqueous solution, the general form of the equilibrium reaction is:

     HA(aq) + H2O(l)  A- (aq)+ H3O+(aq)


where:

HA is an acid that dissociates into the conjugate base of the acid A- 

and a hydrogen ion that combines with water to form the hydronium ion H3O+.

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