An unknown clear liquid solvent is tested for identification in the lab using
solubility tests. The unknown solvent is either methanol (CH3OH), methane
(CH4), or pentane (C5H12). The unknown liquid is mixed with the following
solutes, NaCl, H20 and C2H6. The solutes that are soluble in the unknown
solvent are NaCl and H20. What is the identification of the solvent?
Methane
Pentane
None are possible
Methanol

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

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What is the percentage composition of carbon in the compound ch4