6) Which of these techniques will increase the yield of purified crystal solids?
ID: 713969 • Letter: 6
Question
6) Which of these techniques will increase the yield of purified crystal solids? RETURN TO SITE Let all the liquid solvent evaporate before filtering. Plunge the hot flask of dissolved solid into an ice bath. Let crystals form slowly. Use a large excess of liquid. 7) Diethyl ether and methylene chloride (CH2,Cl2)are both immiscible in water. Ethanol is miscible with water. Which of the following is true? Ethanol/water would make a good solvent pair for crystallization. Diethyl ether/water would make a good solvent pair for crystallization. CH2C12/water would make a good solvent pair for crystallization. Diethyl ether/CH2C12/water would make a good mixture for crystallization. 8) What atom (when present in an odd number) leads to a compound with an odd molecular mass? oxygen chlorine bromine nitrogernExplanation / Answer
Answer 1: c) Let Crystals form slowly
Because of, crystal growth is a process in equilibrium where solute molecules precipitate out of solution and dissolve back into solution. Crystal forms when the solution is supersaturated. So if we let crystals form slowly, It will grow more pure and larger because nucleation will happen slowly.
Answer 2: a) Ethanol-water for layering method of crystallization
If a compound is water soluble, then diffusion with alcohols leads to crystallization.
Answer 3: b)Chlorine
As the sum of Odd numbers present in odd number gives us the odd number. Among all, only chlorine has molecular mass as an odd number.
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