In lab, you will combine aqueous solutions of halide salts, X^- (Cl^-, Br^- and

Question

In lab, you will combine aqueous solutions of halide salts, X^- (Cl^-, Br^- and T^-), with aqueous solutions of halogens, X_2 (Cl_2, Br_2,I_2). You will perform an extraction using the organic solvent dichloromethane (CH_2C1_2) to determine if a reaction occurred. Which solvent (water or dichloromethane) will be on the bottom when an aqueous solution is extracted with dichloromethane? Which species (X- or X2) will be contained in the aqueous layer? Which species (X- or X2) will be contained in the dichloromethane layer?

Explanation / Answer

1 the density of DCM is 1.33 g/mL while the density of water is 1.0 g/ mL. thus DCM is present in the bottom.

Halide anions like Cl-, I- Br- would dissolve well in water, whereas halogen molecules Cl2, I2 Br2 would dissolve better in (CH2Cl2).

2. So aqueous layer contains Halide anions like Cl-, I- Br-

3 DCM layer contains halogen molecules Cl2, I2 Br2

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