Question

Recrystallization is commonly used in the organic laboratory as a way to: A) remove a reaction solvent. B) purify an organic liquid. C) separate the components of a liquid mixture. D) purify an organic solid. E) all of the above 1. What is a limiting reactant? A) reactant with the smallest initial mass B) reactant with the largest initial mass C) reactant that is completely consumed during a chemical reaction D) reactant that is NOT completely consumed during a chemical reaction E) none of the above 2. Anhydrous Sodium sulfate as a drying agent is used in the organic laboratory to: A) remove a reaction solvent. B) dry an organic liquid by absorbing water. C) separate the components ofa liquid mixture. D) purify an organic solid. E) dry an organic solid by absorbing water. 3. 4. What is a theoretical yield? A) the actual yield of a chemical reaction B) yield obtained from theory C) stoichiometric amount of product expected from excess reactant D) product obtained in grams E) stoichiometric amount of product expected from limiting reactant Separatory funnel is commonly used in the organic laboratory as a way to: A) remove a reaction solvent B) purify an organic liquid C) separate the components of an immiscible liquid mixture D) purify an organic solid E) separate the components of a miscible liquid mixture 5. Which of the solvent pairs cannot be separated using separatory funnel? A. Water and toluene C. Methanol and toluene В. Ethanol and water Hexanes and water D.

Answer 1

1)
recrystallization technique is to purify organic solid
option D)
Purify an organic solvent
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2)
limiting reactant is that reactant which limits the reaction and thus consume completely

c) Reactant that is completely consumed during a chemical reaction
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3) it removes water

option A) dry an organic liquid by absorbing water
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4) the mass of product obtained using balanced chemical reaction is theoretical yield
which is decided by limiting reactant
E) stoichiometric amount of product expected from limiting reactant
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5) helpful to separate immisible liquid
option C)
separate component of a immisible liquid
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water is not miscible with organic solvent Hence separating funnel is useful for
option A),B), and D)
methanol and toluene are miscible because both are organic compound.So using
separating fumnel we can not separate them
option C)
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