Affect of Silver Nitrate on the Equilibrium Place 25 ml of 0.1 M cobalt (II) chl

Question

Affect of Silver Nitrate on the Equilibrium

Place 25 ml of 0.1 M cobalt (II) chloride solution in a 125 ml erlenmeyer flask. Place 25 ml of concentrated hcl in a graduated cylinder. Slowly and carefully add hydrochloric acid to the cobalt (II) chloride solution until the solution turns purple. Put about 15 ml of the purple solution into a 50 ml beaker. Place about 5 ml of silver nitrate solution into a clean test tube or small beaker. Add the silver nitrate solution dropwise to the cobalt solution. Continue adding silver nitrate until a change is seen.

When silver nitrate was added to the equilibrium mixture, the color of the solution changed from purple to pink.

1. What ions were present in the following solutions before you added them together? (Include states-of-matter under the given conditions in your answer.)

a.     Silver nitrate?

b. Complex ion solution?

Explanation / Answer

(a) In silver nitrate solution

AgNO3 (aq.) ---------------> Ag+(aq.) + NO3- (aq.)

(b) In complex ion solution

CoCl2.6H2O (aq.) ----------------> [Co(H2O)6]2+ + 2 Cl- (aq.)

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