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Chapter 9: Q12P (page 208)

A 0.0450Msolution of HAis 0.60%dissociated. CalculatepKafor this acid.

Short Answer

Expert verified

The pKa for HA is=5.79

Step by step solution

01

Define pKa

pKais the number that describes the acidity of a particular molecule. The formula to find the pKa is

role="math" localid="1654857717351" pKa=-logKa

02

Reaction of HA dissociation

HA鈬�H++A-HA=0.0450-xH+=A-=x

03

Fraction of dissociation

Substituting the value of aand F in equation

a=xF=0.0060鈬�x=a脳Fx=0.0060脳0.0450

04

Calculating the value of  Ka

By using the formulaKa=x2F-x

Substituting the value ofxand F we get

Ka=x2F-xKa=0.0060脳0.045020.0450-0.0060脳0.0450=1.6脳10-6

05

 Step 5: Finding the value of pKa

Substituting the value of Kain the formula role="math" localid="1654858632522" pKawe get

pKa=-logKa=-log1.6脳10-6=5.79

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