Question

#1 and #2 please!

A ALLICI Evidence of a shift in equilibrium by a change in concentration can easily be observed if one of the substances involved in the equilibrium is colored. The appearance of a preeinitnte NAME REPORT FOR EXPERIMENT 24 (continued) E. Cobalt(II) Chloride Solution 1. What was the evidence for a shift in equilibrium when conc. hydrochlorie acid was added to the cobalt chloride solution? 2. (a) Write the equilibrium equation for this system. (b) State whether the concentration of each of the following substances was increased, decreased, or unaffected when the cone. hydrochlorie acid was added to cobalt chlo- ride solution. CoCI Co(H 0) Cl- 3. (a) What did you observe when ammonium chloride was added to cobalt chloride solution?

Answer 1

(1) the color of the solution ( [Co(H₂O)₆]²⁺ )changes from reddish pink to blue ( [CoCl₄]^2- ) .

(2)

[Co(H₂O)₆]²⁺(aq)  + 4Cl^-(aq) $\leftrightharpoons$ [CoCl₄]^2- (aq) + 6H₂O(l)

(3)

According to LeChalier principle , when an equilibrium is disturbed from equilibrium position, equilibrium will shift in the direction to minimise the change causes the disturbance. On adding conc.HCl, concentration of Cl^- increases , equilibrium will shift in forward direction to consume the added chloride ions.

[Co(H₂O)₆]²⁺ -decrease,,[Cl^-] -deceases,,[CoCl₄]^2- -increase