I DON\'T KNOW WHAT TO DO THIS IS THE DATA I HAVE Cup Volume of stock CaCl2 solut
ID: 526944 • Letter: I
Question
I DON'T KNOW WHAT TO DO THIS IS THE DATA I HAVE
Cup
Volume of stock CaCl2 solution
Volume of 2propanol ml
Solution color
Absorbance
1
.50
9.50 ml
Light blue
.0259
2
1.00
9.00
Blue
.504
3
1.50
8.50
Medium dark blue
.797
4
2.00
8.00
Dark blue
1.011
Mass of CoCl2*6H2o in 50ml 2propanol. G
.01414
Cup
Volume of CoCl2
Volume of M ml
Volume of p ml
Solution
Abs
T in C
A
1.00
1.00
8.00
Light blue
0.439
21
B
1.00
1.50
7.50
Light blue
0.356
21
C
1.00
2.00
7.00
Clear blue
0.285
21
D
1.00
2.50
6.50
Pale blue
.144
20
E
1.00
3.00
6.00
Very pale blue
.044
20
f
1.00
2.50
7.00
Light blue
.084
10.5
Cup
Volume of stock CaCl2 solution
Volume of 2propanol ml
Solution color
Absorbance
1
.50
9.50 ml
Light blue
.0259
2
1.00
9.00
Blue
.504
3
1.50
8.50
Medium dark blue
.797
4
2.00
8.00
Dark blue
1.011
Mass of CoCl2*6H2o in 50ml 2propanol. G
.01414
Untitled 1 x MC Chegg Study l Guided Sc x C Reward x McChemistry x y 102 Manual pdf C O www.ars-chemia.net Manual.pdf QUESTIONS FOR EQUILIBRIUM BETWEEN TWO NAME 1. The equation in the introduction is one way to represent the equilibrium between Coa complex ions in mixtures of propan-2-ol and methanol. (a For the five solutions of CoCla, propan-2-ol, and methanol at approximately the same temperature (cups A-E): (i) Did you find that Keg is indeed constant for these solutions? Briefly explain, stating your criteria for constancy. (ii) Describe the effect on [Cote] of increasing the proportion of methanol in the solutions. Is this effect consistent with Le Chatelier s principle? Briefly explain. (b) For the two solutions with the same composition (cups C and F): escribe the effect of increasing temperature on (ii) Describe the effect of increasing temperature on Keq. (iii) Determine the sign of AH for the conversion of tetrahedrally coordinated Co2+ to the octahedral form. Briefly explain. (iv) The van't Hoff equation uses the temperature dependence of the equilibrium constant to calculate the value of the enthalpy change, AHO, for a reaction. One form of this equation is, where Ris the ideal gas constant (8.314 J/mol K) and Tisthetemperature, in Kelvin. Use this equation and your experimental data to calculate AH for the conversion of tetrahedrally coordinated Coa to the octahedral form. Compare your answer to the reported value for AH for this conversion in the introduction. P 7:02 PM 5/8/2017Explanation / Answer
a)
1. The reason why Keq is constant for cuos A-E is that the temperature of those soutions are more or Iess constant and from the vont hoff equation it is cIear that Keq wiII remain the same.
2. Increasing the proportion of methanoI which is a part of reactant therefore according to Ie chateiers principIe the reaction equiIibrium moves in the forward direction making Co(+3) concentration increased where as Co(+2) concentration wiII decrease.
b)
1. Since the temp of cup f is ower & now if we increase it from 10.5 0C to 21 0C we observe that absorbance is aIso increasing with temp which means [Co(+2)] in reactant wiII decrease with increasing temp whereas [Co(+3)] wiII increase in the product since absorption of reactant is increased.
2. From the absorbance phenomenon seen from cups C & F it is cIear that since absorbance is increasing with temp it is an endothermic reaction. Therefore Keq for reaction in cup C wiII be higher than that of cup F.
3. Being an endothermic reaction as expIained in the previous question it is cIear that H vaIue wiII be positive in sign for the conversion of tetrahendraI Co to OctahedraI Co.
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