# Dissociation Constant

#### SaintJude

##### Full Member
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)

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

##### Full Member
7+ Year Member
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)

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

#### SaintJude

##### Full Member
Oh, yup, I definetely missed that point. Glad I posted it. Thanks!

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