Answer to Question #172531 in General Chemistry for eafd

Question

Effect of adding NH4SCN: Le Chatelier’s Principle Lab

1. In a moment, you will be adding NH4SCN to your reaction system. Adding NH4SCN should affect the concentration of which species in the equilibrium reaction?
2. Should this speed up the forward reaction or the reverse reaction?
3. According to Le Chatelier’s principle, predict which way the reaction should shift (left or right)
4. Now to test your prediction – to test tube #2, add a few crystals of solid NH4SCN.
5. What do you observe happening? Report any color changes or other changes you observe. 

Answer 1

FeCl₃ + 3NH₄SCN = Fe(SCN)₃ + 3NH₄Cl

1. Affect the conentrations of all components
2. In equilibrium rates of forward and reverse reactions are equal
3. Right
4. One-two is enough
5. Red color appears