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 10-7OxalicH2C2O45.9 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;

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FREE Expert 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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Problem Details

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



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Our tutors have indicated that to solve this problem you will need to apply the Ka and Kb concept. You can view video lessons to learn Ka and Kb. Or if you need more Ka and Kb practice, you can also practice Ka and Kb practice problems.

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Based on our data, we think this problem is relevant for Professor Taylor's class at UTD.