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# Brønsted–Lowry Reaction Quotients

APCHEM-LLQG59

$$C{ H }_{ 3 }C{ H }_{ 2 }COOH(aq)+ { H }_{ 2 }O(l) \rightleftarrows { H }_{ 3 }{ O }^{ + }(aq)+{ CH }_{ 3 }CO{ O }^{ – }(aq)$$

Given the equation above for the reaction between propanoic acid, $C{ H }_{ 3 }{ CH }_{ 2 }COOH$, and water, which of the following is the correct reaction quotient expression for this reaction?

A

$Q=\cfrac { \left[ { H }_{ 3 }{ O }^{ + } \right] \left[ { CH }_{ 3 }CO{ O }^{ – } \right] }{ \left[ C{ H }_{ 3 }{ CH }_{ 2 }COOH \right] }$

B

$Q=\cfrac { \left[ { H }_{ 3 }{ O }^{ + } \right] \left[ { CH }_{ 3 }CO{ O }^{ – } \right] }{ \left[ C{ H }_{ 3 }{ CH }_{ 2 }COOH \right] \left[ { H }_{ 2 }O \right] }$

C

$Q=\left[ { H }_{ 3 }{ O }^{ + } \right] \left[ { CH }_{ 3 }CO{ O }^{ – } \right]$

D

$Q=\cfrac { \left[ { CH }_{ 3 }{ CH }_{ 2 }COOH \right] }{ \left[ { H }_{ 3 }{ O }^{ + } \right] \left[ { CH }_{ 3 }{ { CH }_{ 2 }COO }^{ – } \right] }$