chem assignment

Experiment 5: EXPERIMENTS IN CHEMICAL EQUILIBRIUM
PART 1: Determination of the Effect of Various Influences on the Position of Equilibrium

Solubility Equilibria
1-What did you observe upon adding the concentrated hydrochloric acid to the sodium chloride solution?
2. (1 mark) Explain your observations.
3. (0.5 mark) What did you observe upon adding the dilute hydrochloric acid to the sodium
chloride solution?
4. (1 mark) Explain your observations.
Complex Ion Equilibria
5. (0.5 mark) What did you observe upon adding Fe3+ ion to the [FeSCN]2+ solution?
6. (1 mark) Explain your observations.
7. (0.5 mark) What did you observe upon adding SCN– to the [FeSCN]2+ solution?
8. (1 mark) Explain your observations.
9. (0.5 mark) What did you observe upon adding Ag+ to the [FeSCN]2+ solution?
10. (1 mark) Explain your observations.
Acid/Base Equilibria
11. (0.5 mark) What did you observe upon adding ammonium ion to the dilute ammonia solution
containing phenolphthalein?
12. (1 mark) Explain your observations.
13. (0.5 mark) What did you observe upon adding hydrochloric acid to the dilute ammonia
solution containing phenolphthalein?
14. (1 mark) Explain your observations.
15. (0.5 mark) What did you observe upon adding concentrated ammonia solution to the dilute
ammonia solution containing phenolphthalein?
16. (1 mark) Explain your observations.
Supplementary Questions
17. (1.5 marks) Explain in your own words why a saturated solution in contact with some
undissolved solid is considered to be an equilibrium situation.
18. (1.5 marks) Rationalize how the addition of the silver nitrate to the Fe3+ / SCN– equilibrium
system had an effect even though neither Ag+ nor NO3– appears in the equation shown in the text.

Experiment 5: EXPERIMENTS IN CHEMICAL EQUILIBRIUM

PART 1: Determination of the Effect of Various Influences on the Position of Equilibrium

Solubility Equilibria

1-What did you observe upon adding the concentrated hydrochloric acid to the sodium

chloride solution?

2. (1 mark) Explain your observations.

3. (0.5 mark) What did you observe upon adding the dilute hydrochloric acid to the sodium

chloride solution?

4. (1 mark) Explain your observations.

Complex Ion Equilibria

5. (0.5 mark) What did you observe upon adding Fe3+ ion to the [FeSCN]^(2+) solution?

6. (1 mark) Explain your observations.

7. (0.5 mark) What did you observe upon adding SCN– to the [FeSCN]2+ solution?

8. (1 mark) Explain your observations.

9. (0.5 mark) What did you observe upon adding Ag+ to the [FeSCN]2+ solution?

10. (1 mark) Explain your observations.

Acid/Base Equilibria

11. (0.5 mark) What did you observe upon adding ammonium ion to the dilute ammonia solution

containing phenolphthalein?

12. (1 mark) Explain your observations.

13. (0.5 mark) What did you observe upon adding hydrochloric acid to the dilute ammonia

solution containing phenolphthalein?

14. (1 mark) Explain your observations.

15. (0.5 mark) What did you observe upon adding concentrated ammonia solution to the dilute

ammonia solution containing phenolphthalein?

16. (1 mark) Explain your observations.

Supplementary Questions

17. (1.5 marks) Explain in your own words why a saturated solution in contact with some

undissolved solid is considered to be an equilibrium situation.

18. (1.5 marks) Rationalize how the addition of the silver nitrate to the Fe3+ / SCN– equilibrium

system had an effect even though neither Ag+ nor NO3– appears in the equation shown in the