Question 3 10 pts If you recrystallize an impure sample of 200 mg which contains

Question

Question 3 10 pts If you recrystallize an impure sample of 200 mg which contains 125 mg of desired compound but you only isolate 75 mg of desired compound what is percent recovery? 37% O 40% 63% O 60% Question 4 10 pts Related to the question above (which states "If you recrystallize an impure sample of 200 mg which contains 125 mg of desired compound but you only isolate 75 mg of desired compound what is percent recovery?"), how can you increase the percent recovery? Add the 75 mg that you isolated back to the filtrate and repeat the recrystallization. Since recrystallization typically never allow 5 for 100% compound recovery simply move on with the 75 mg and dump the filtrate in the liquid chemical waste Jug and make a note in your laboratory notebook Evaporate the rate on the steam bath to recover the crude material and recrystallze again using the same method but while cooling the sa pie ado a sma amount of the pure compound that you isolated in the first round of recrystallization (process known as "seeding") then collect the crystals once they form and combine them with the original batch of purified crystals. Question 5 10 pts Percent recovery is the same thing as percent yield. True False

Explanation / Answer

Ans 3 : 60 %

Percent recovery = ( recovered amount / actual amount) x 100

So putting all the values we get :

= ( 75 / 200) x 100

= 37 %

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