Question

1. Why is it necessary to keep pipettes separate; that is to use the H2O pipette...

1. Why is it necessary to keep pipettes separate; that is to use the H2O pipette only for H2O, and hexane pipette for hexane only?

2. . Extraction is a technique in which two immicible solvents are used to separate compounds, based on solubility. Give two examples of immicible solvent pairs that might be used for extraction.

Cannot use the following as examples:

Water and ethyl alcohol

Water and diethyl ether

Water and methylene chloride

Water and hexane

Hexane and methylene chloride

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Answer #1

1, It is necessary to keep pipettes separate. This is because, if we use same pipette, it may get contaminated with other solvent or compound. If the pipette is contaminated, we may get the erroneous results which will affect our experiment. Moreover, if we use same pipette for organic and aqueous solvents, as both of them do not mix; consequently, if in some measurement, we need add only organic solvent, if water contaminant is present, that may cause disturbance in our result.

2. Two immiscible pairs of solvents

(i) Water and ethyl acetate

(ii) water and chloroform

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