Q.

What is the [HCOO-]in the solution that contains 0.015 M HCOOH and 0.02 M HCI? 

Ka (HCOOH)=1.8 x 10-4

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a

1.35×104

b

8×103

c

1.8×104

d

1.8×102

answer is B.

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Detailed Solution

HCOOHH++HCOO-

HCl0.020H00.02++Cl-00.02

Ka=H+HCOO[HCOOH]

1.8×104=0.02×HCOO0.015

HCOO=1.35×104M

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What is the [HCOO-]in the solution that contains 0.015 M HCOOH and 0.02 M HCI? Ka (HCOOH)=1.8 x 10-4