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Chapter 9: Q9TY (page 206)

Find pH if pKa=3.00instead of 2.00Does the answer make sense?

Short Answer

Expert verified

The pHifpKa=3.00then 3.07

Step by step solution

01

Define the acid dissociation constant

The acid dissociation constant K3can be given as,localid="1654854432154" K3=H-A-HA

A weak acid is one that doesn't undergo completion

02

Step 2: Calculate the H+ ion for Ka.

The H+can be calculated from

HA鈼�H++A-nKaKa=H+IA-]HA10-3.00=X0.0100+X0.0100-XX=8.44脳10-4NowPh.pH=-log8.44脳10-4pH=3.07

Thus, The pHifpK3=3.00then3.07

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