1.The solubilities in water of several substances are listed. Classify each of t

Question

1.The solubilities in water of several substances are listed. Classify each of these substances as soluble, insoluble or moderately soluble.

a. Camphor, C10H16O (topical anti infective): 0.1g per 100mL H2O at 25*C

b. Sodium formate, NaHCO2 (fabric ink): 97.2g per 100g H2O at 20*C

C. Cobalt(II) fluroide, CoF2 (catalyst in organic rections): 1.5g per 100g H2O at 25*C

2. Predict weather each of the following ould be more soluble in water or hexane.

a. magnesium nitrate, Mg(NO3) (in fireworks)

b. heptane, C7H16 (gasoline octane rating)

3 Would you expect lactic acid, CH3CH(OH)CO2H (in sour milk) or myristic acid, CH3(CH2)12CO2H (cosmetics) to be more soluble in water? why?

Explanation / Answer

1

a Insoluble

b Soluble

c Moderately soluble

2

a) Water because magnesium nitrate is an ionic compound with Mg cations and nitrate anions. So, it would be more soluble in an ionic solvent i.e. water.

b) Hexane because heptane is a covalent compound . So, it would be more soluble in an covalent solvent i.e. hexane.

3.

Myristic acid because there will be intramolecular hydrogen bonding between Oh and COOH in lactic acid and it will reduce its solublity.

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