Decane is non-polar liquid and has density of 0.730 g/mL. Water has a density of

Question

Decane is non-polar liquid and has density of 0.730 g/mL. Water has a density of 1.00 g/mL. 5 mL of each of decane and water is transferred to a glass test tube at room temperature. Now 5 mL of saturated iodine-water solution, which has a strong purple color, is added to the test tube. The test tube is gently shaken and then kept in a test tube rake. Which one of the following observations will hold true? a. The two liquids are immiscible and lower portion of liquid in the test tube will have a strong purple color. b. The two liquids are immiscible and upper portion of liquid in the test tube will have a strong purple color. c. The two liquids are miscible and liquid in the test tube will have a uniform color throughout. d. Decane, water and iodine will form three layers.

Explanation / Answer

decane = nonpolar, 0.73 g/mL

water = polar, 1 g/mL

Note that decane will be lighter, so it goes in the upper layer and water goes in the lower layer.

addition of 5 mL of iodine-water solution

note that polar + nonpolar is immiscible, so ignore C

now, there are only two possible layers, so ignore D

therefore, the answer is between a and b

the iodine is mostly nonpolar, I2(s) therefore, it will be present in greater extent in the nonpolar mix, some I- will be present in the aqueous solution so there is iodine in both cases

The iodine will have a higher affinity toward nonpolar solvent.

therefore, this is the upper layer.

choose B

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