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SaintJude

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Jan 4, 2012
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When 10mL of a 1 M K3PO4 solution is titrated with 1 M HCl, the pH corresponding to the hydrophosphate/dihydrophosphate buffer region is found to be X. What is the dissociation constant of dihydrophosphate?

A. 10^(1-x)
B. -log 10^-X
C. 10^-X
D. 10^(1+x)

Answer is C:

I think I'm missing the conceptual point behind this question. So the dissociation constant is just the concentration of the H+ ion it dissociates?
 

MrNeuro

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Mar 17, 2010
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  1. MD/PhD Student
When 10mL of a 1 M K3PO4 solution is titrated with 1 M HCl, the pH corresponding to the hydrophosphate/dihydrophosphate buffer region is found to be X. What is the dissociation constant of dihydrophosphate?

A. 10^(1-x)
B. -log 10^-X
C. 10^-X
D. 10^(1+x)

Answer is C:

I think I'm missing the conceptual point behind this question. So the dissociation constant is just the concentration of the H+ ion it dissociates?

pH = pKa
pKa = - log (Ka)
10^-pKa = Ka
 
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