Equilibrium: What direction?

You have a reaction mixture and want to determine if equilibrium has been reached, or, if not, the direction (toward products or reactants) that the reaction will proceed. The reaction is:

A + B ---> 2C and K_c for this reaction is 1.

You measure the concentrations of A, B and C, but you forget to label which concentration belongs to each species. The concentrations that you measure are:

Measurement Concentration
1 0.2M

2 0.05M

3 0.1M

Measurement	Concentration
1	0.2M
2	0.05M
3	0.1M

Assign the concentration measurements to A, B or C if:

***A*** ***B*** ***C***

the reaction will go towards reactants 0.05 M
or
0.1 M 0.1 M
or
0.05 M 0.2 M

Return to problem

	*A*	*B*	*C*

the reaction will go towards reactants	0.05 M or 0.1 M	0.1 M or 0.05 M	0.2 M