chem assignment

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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.
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