Concentration of 2nd Conjugate Base

[Teleologist]

Consider a solution of phosphoric acid. Ka1 = 7.1 * 10^-3, Ka2 = 6.3*10^-8, Ka3 = 4.5*10^-13. What is the closest choice to the concentration of the second conjugate base?

a) 2.3 * 10^-5 M
b) 6.3 * 10^-8 M
c) 7.1 * 10^-3 M
d) 4.7 * 10^-13 M

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[Czarcasm]

Consider a solution of phosphoric acid. Ka1 = 7.1 * 10^-3, Ka2 = 6.3*10^-8, Ka3 = 4.5*10^-13. What is the closest choice to the concentration of the second conjugate base?

a) 2.3 * 10^-5 M
b) 6.3 * 10^-8 M
c) 7.1 * 10^-3 M
d) 4.7 * 10^-13 M

That's a strange question and not a valid comparison we can make without knowing the concentration of the initial acid.

 

[Teleologist]

not a valid comparison we can make without knowing the concentration of the initial acid.

You sure about that.

 

[Czarcasm]

You sure about that.

Enlighten me.

 

[Teleologist]

Coulomb's law.

 

[Czarcasm]

Coulomb's law.

Cool.

 

[premed1001]

Coulomb's law.

explain?

 

[Teleologist]

Ka1 >> Ka2 >>> Ka3. Coulomb's law.

Ka2 = [H3O(+)][HOPO3(2-)]/[(HO)2PO2(-)]

The result of [H3O(+)]/[(HO)2PO2(-)] is unity. Coulomb's law.