Question

Please solve A B and C. Show each step to the solutions. I attached the answers for B but am not sure how to get to these solutions.

please solve A B and C. Show each step to the solutions 6.82. A salt A is soluble in a solvent S. A conductivity meter used to measure the solute concentration in A-S solutions is calibrated by dissolving a known quantity of A in S, adding more S to bring the solution volume to a fixed value, and noting the conductivity meter reading. The data given below are taken at 30°C: (b) Meter Solution Solute Reading Volume Dissolved R (mL) (g) 0 100.0 0 30 100.0 20.0 45 100.0 30.0 The following experiment is performed. One hundred sixty grams of A is dissolved in S at 30°C. S is added until a final solution volume of 500 mL is obtained. The solution is cooled slowly to 0°C while being stirred and is maintained at this temperature long enough for crystallization to be complete. The concentration of A in the supernatant liquid is then measured with the conductivity meter, yielding R= 17.5. The solution is next reheated in small temperature increments. The last crystal is observed to dissolve at 10.2°C. A specific gravity of 1.10 may be assumed for all A-S solutions. (a) Derive an expression for C(g A/mL solution) in terms of R. (b) Calculate the solubilities (g A/100 g S) at 10.2°C and 0°C and the mass of solid crystals in the beaker at 0°C. If half the solvent in the flask were to evaporate at 0°C, how much more A would come out of solution? (c) Problem 11 6.82 Answer: b) Solubility at 10.2°C= 41.0 g A/100 g S; Solubility at 0°C 11.8 g A/100 g S; Mass of solid A = 114 g

Answer 1

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At oc, R175 dcrive d cayliev> x-6e use relahonbehveen and 7 5 X - 165-17.5 O.1/ 86x100 g A O./1 86 g A. 8 ge/100s At tubrtity 150 /50 hsialued L 6b6Zx590 Sa in 500-mStlcte weight tdridsoteat 60gan Tota in3oo At o'c, -0-1I 3 gA/gs Given, to tol weight of S ia sohution= 390gm ound carher weyht of A dissalued) = X x 370 =0.118 x390 46 gm Totat weight oft A issolved crystal) ezyshal)= Total wight of A- weight ol Ahasalue) weight 97-091 114 gm 1 E solvent S-370 c Total soluent S- 370 gm evopor al ed, werght when hal Soluent s Scanned with CamScanner /5gm cS

weight tof Adhsso lved Goo)- Xx 195 01/8 x/95 23gm dissolurd (carer) = 46 gm weightof that Came ou 3 4 6 Plore Weight of A CS Scanned with CamScanner
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