5. Given that an aqueous solution of Co(HO), is pink and an aqueous solution of

Question

5. Given that an aqueous solution of Co(HO), is pink and an aqueous solution of Co(NHL),2 + is blue, answer the following questions about an equilibrium system involving these cobalt(II) ions. CoHO, "(a) + 6 NH, (aq) Co(NHY,*aq) + 2 HOCO) Assume that you have a solution containing Co(HO),2(aq). a. Predict what you should observe when NH,(aq) is added to the solu tion. b. Explain why you made the prediction using concepts from Le Chate lier’s principle. C. Write the chemical formula of the substance that increased in amount as a result of adding NH,(aq) to the CoHO).2 solution. Write the formula of the substance that decreased in amount

Explanation / Answer

First, let us state the Le Chatelier principle which deals with changes in an equilibrium:

The statement is as follows:

If any equilibrium is disturbed, that is, change in conditions such as P,T, concentration, partial pressure, etc.., the system will counterbalance such change in order to favour the system's equilbirium.

a)

if we add NH3(aq)

which is in the LEFT side of the reaction, then

the left side increases in quantity, the equilbirium must shift towards the RIGHT, therefore, expect much mor ecomplex formation

Co(NH3)6+2 will form, which is BLUE in color.... therefore, pink decreases, blue increases

b)

As stated by le chatelier, the shift must counterbalance the increase of NH3

then

the system will initially be very "Pink" since NH3 is present, but will form much more Co(NH3)6+2 eventually, which is blue

c)

increases when NH3:

Co(NH3)6+2

decreases when NH3 is added:

Co(H2O)6+2

Related Questions

Navigate

• Browse (All)
• Browse 5
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.