The following table gives the room temperature density for various substances: S

Question

The following table gives the room temperature density for various substances: Substance Glycerol Water Density 1.25 g/mL 0.997 g/mL 0.91 g/mL to 0.93 g/mL 0.83 g/mL to 0.89 g/mL 0.791 g/mL 0.659 g/mL Fattv acid esters Methanol Hexane At room temperature, the density of triacylglycerols (vegetable oils) range from 0.91 g/mL to 0.93 g/mL, while fatty acid esters are typically 0.83 g/mL to 0.89 g/mL depending on the vegetable oil source. Assume glycerol, water and methanol are completely soluble in each other, but triacylglycerols and fatty acid esters are immiscible (insoluble) in glycerol or water and are partly soluble in methanol. Further assume, triacylglycerols and fatty acid esters are soluble in hexane, but that hexane is immiscible with water, methanol and glycerol. Let us say you run a transesterification (fatty acid ester) synthesis with only triacylglycerols, potassium hydroxide (KOH) and methanol (MeOH): Triacylglycerols+KOH+ MeOH->Fatty Acid Esters+KOH+Glycerol Now select ALL the correct statements given the above information. (To receive credit you must select all the correct statements and NOT select those that are false.)

Explanation / Answer

Correct statements are

(1) After running synthesis, if you add hexane, shake and then centrifuge, the fatty acid esters and triacylglycerols will be in the hexane layer and will be largely free of methanol.

(2) Fatty acid esters will sing in glycerol.

(3) After running the synthesis and centrifuse the reaction mixture, the lower layer will contain the majority of potassium hydroxide used in the synthesis.

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