EM 150L Chapman University tension Questions 8-1 Experiment ik crystals of cobal
ID: 514035 • Letter: E
Question
EM 150L Chapman University tension Questions 8-1 Experiment ik crystals of cobalt(ID chloride hexahydrate, Coclz. 6Hzo, are actually in the form of [Coo ]Cl2 in this solid. They are pink because they contain the pink aquo complex, Haoer The chloro complex, ion, is blue. that measure humidity levels in the air by changing colors utilize the following reaction 2 [Co(H20)6]Cle a. when the humidity is low, will the equilibrium shift to the right or to the left? Explain. b. What color will the cobalt(I) crystals be when the humidity is high? Explain. c. Cobalt(ID crystals are often placed in sealed containers used to store samples to ensure a dry environment. As the crystals remove moisture from the air, they change color. Would the crystals of the aquo or chloro complex be used? What color change do you observe as the crystals remove moisture from the air? Explain. 2. Below is the equilibrium system for an acid base indicator, B, with a yellow and red form. What color will the solution be if a few drops were added to NaoH? Explain. YellowExplanation / Answer
According to Lechatlier's principle,
Increase in concentration of reactants or decrease in concentration of products will shifts the reaction towards right side.
and
Decrease in concentration of reactants or increase in concentration of products will shifts the reaction towards left side.
1.
(a) low humidity means amount of H2O is low, so, it shifts the equilibrium towards right side.Because it is one of the products and as its concentration is decreased equilibrium shifts towards right isde.
(b) Increase in concentration of H2O, i.e. humidity, increases the concentration of products. So, it shifts the equilibrium towards left side. Hence the colout would be pink.
(c) Cobalt chloro complex will be used to remove water from air. And it changes from blue colour to pink colour during this process.
2.
Addition of base increases the concentration of OH- ions, it shifts the equilibrium towards left side.So, the color of the indicator would be yellow.
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