sonu gnc suppurting evidence allu ally to that eftect. (4 points) 2· The solubil
ID: 1088610 • Letter: S
Question
sonu gnc suppurting evidence allu ally to that eftect. (4 points) 2· The solubility of benzoic acid in water is known to be 1.7 g/L at 0 °C and 680 g/L at boiling. A student performed recrystallization starting with 0.70 g of crude benzoic acid dissolving it in 8.0 mL of water. He continued the experiment as described in our lab manual. Calculate the maximum % recovery of benzoic acid for the student (6 points). Could you improve on the student's (question #2) experiment in order to increase the performing the procedure similarly to the one provided in the lab manual. (4 points) 3. yield? Explain and'give exact details of how you would improve the yield still methods for 4. Growing crystals is considered an art in chemistry and there are many growing good quality crystals. In this week's lab we used an evaporation technique to grow crystals. Another method for growing crystals is called vapor diffusion. A chemist used this method to grow erystals of benzoguanamine, BZG (shown below). BZG is soluble in ethanol but practically insoluble in acetone. The chemist's set up (shown inExplanation / Answer
2) 1000mL of water is able to dissolve 68 gm of benzoic acid
1mL of water can dissolve 68/1000 = 0.068 gm of benzoic
8mL of water can dissolve 8*0.068 = 0.544 gm of benzoic acid
Maximum % recovery = (0.544 gm / 0.7 gm)*100 = 77.7142 %
3) (i) better separation of products from impurities (ii) Avoid weighing errors
(iii) Wait until the reaction completes
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