Experiment 16 Prelaboratory Assignment LeChâtelier\'s Principle: Buffers 0.. Des

Question

Experiment 16 Prelaboratory Assignment LeChâtelier's Principle: Buffers 0.. Desk No. Date_ 1. a. Describe the dynamic equilibrium that exists between the two water tanks at right. b. Explain how LeChâtelier's principle applies when the faucet on the right tank is opened. c. Explain how LeChâtelier's principle applies when water is added to the right tank. 2. a. Experimental Procedure. Cite the reason for each of the five cautions in the experiment. 13a b. Experimental Procedure, Part E. 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. NHy(ag) is added to Ag (ag)+CI(aq) AgCs) b. HNotap is added to AgCO)(s) Ag+ (aq) + CO,"(aq) c. Klag) is added to Ag (ag) +2 NH,(a)IAg(NH)hl'(ag) d. Na,S(ag) is added to Agli) = Ag* (aq) + r(ag) e. KOH(a) is added to CHCOOHaq)+H,0 H,O'(aq) +CH,CO, (ag) r. HCdaq) is added to 4 cr(aq) + Co(H2ox" (aqCoC,2-(aq) + 6 H,O() Experiment 16 213

Explanation / Answer

1)

a)

The dynamic equilibrium between the two tanks on the right is such that molecules of both tank are in equilibrium with each other or they are moving from one to another tank without any hinderance

b)

When the faucct on the right is open then due to force applied by the molecules of left tank,molecules of right tank flows.

c)

According to LeChaiteliers principle when water is added to the right tank the water level of the left tank rises to bring the equilibrium between both tank.

2

a) i) use gloves

ii) use gogles

iii) use cafron

iv) use of proper clothes(mainly full)

vi) use of shoes

b)

Bumping is avoided by putting heating wire to avoid direct contact of glassware so that the flame is continuous through whole glassware.

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