Experiment 16 Prelaboratory Assignment LeChatelier\'s Principle: Buffers 1. Desc

Question

Experiment 16 Prelaboratory Assignment LeChatelier's Principle: Buffers 1. Descritse the dynamic equilibriom that exists between the 3c.or 2 +once,are cerce c-cd 'wo water tanks right. aeipe, o 885sence es ence lain how LeChâteliers principle applies w faucet on the right lank is opened tonx decc eases arnart-..(^oitr in He, rigns 005 on e. Explain how LeChätelier's e. Explain how LeChatelier's principle applies when water is added to the righs tank. again esiabi shin 2. a. Esperimental Procedure. Cihe the reasn for cach of the five cautions in the experimens. b. Experimental Procedure. How is "bumping" avoided in the preparation of a hot water bath 3. The following chemical equilibria are studied in this experiment. To become familiar with their behavior, indicate the direction. left or right, of the equilibrium shift when the accompanying stress is applied to the system. a. NHfaq) is added to Ag+ (aq) + cr (ag) = AgCl(s) b. HNO,(ag) is added to Ag cO,(o) Ag'(ag)+CO,2 (ag) c. Klag) is added to Ag,(aq) + 2 NH,(ag) Ag(NHJ10aq) d. Na,S(ag) is added to Agl(s)Ag'(ag)+I(ag) war e. KOH(ag) is added to CHCOOH(aq) + HJX),0.(aq) +CHCO, (aq) Cocu.2 (aq) + 6 Hrou) f. HCI(ag) is added to 4 CI-(aq) + Co(H2O)62. (aq) Experiment 16 2

Explanation / Answer

2 a.

: Wear your safety glasses. Dissolve 4 g of cobalt chloride-6-water in 40 cm3 of deionised water. The following equilibrium is set up when the crystals are added to water: CoCl4 2- + 6H2O Co(H2O)6 2+ + 4ClBlue Pink Since the pink colour is predominant, we may conclude that the equilibrium lies on the right hand side. Using a fume cupboard, add concentrated hydrochloric acid, with stirring, until a violet solution is formed. Adding more concentrated hydrochloric acid produces a blue colour, while adding water will restore the pink colour. By trial and error produce an

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