Could someone please answer these questions and explain how they got their answe
ID: 522615 • Letter: C
Question
Could someone please answer these questions and explain how they got their answers. I do not understand how to answer problems based off of solubility tables, so any help that you can offer would be very appreciated
Solubility in Water Solubility in Ethanol (g/100 mL) (g/100 mL 100 °C 100 °C 25 °C 25 °C 10.1 Compound A 0.5 4.6 2.1 3.4 14.2 Compound B 5.1 22.6 1. You have a mixture of Compounds A and B. Can either be separated out by hot filtration? Why or why not? 2. You recrystallize 4.4 g of Compound A from 100 mL of water. How much of Compound A would remain in solution after cooling to 25 °C. 3. What would be your expected percent recovery in the case described in question 3?Explanation / Answer
Q1.
A+ B
most likely, since increase in tempreature will change drastically solubility of A and B
recommended to use water
Q2.
m = 4.4 g of A V = 100 mL
find A when T = 25°C
S = 0.5 g / 100 mL left
so
m = 4.4-0.5 = 3.9 g will crystallize
0.5 g remain in
Q3.
% recovery = recovered/total * 100% = 3.9/4.4 *100 = 88.6363 %
Q4.
if we use ethanol
initially 4.4
finally; 2.1
recovery = 4.4-2.1 = 2.3
%recovery = 2.3/4.4 *100 = 52.27%
Q5.
use the least amount of of ethanol possible
100 V = 10.1
V = 4.4
V = 4.4/10.1*100 = 43.5 mL would be better
Q6.
%recov
2.1*43.5/100 = 0.9135 if left
recovery = 4.4-0.9135 = 3.486
%recovery = 3.486/4.4*100 = 79.2%