Core practical 5

Question 1

Why is ethanol added to the test tube containing the halogenoalkanes in the hydrolysis reaction?

Answer 1

To increase the solubility and dissolve the halogenoalkane so the reactants are miscible

Question 2

Why are the test tubes containing the silver nitrate added to a water bath?

Answer 2

To allow the solution to equilibrate and reach the same temperature

Question 3

Why are halide ions are present in the mixture containing a halogenoalkane which has only covalent bonds?

Answer 3

The halogenoalkane is hydrolysed
C-Hal bonds break

Question 4

Describe an experiment that would allow the the relative rates of hydrolysis of halogenoalkanes to be compared

Answer 4

Use ethanol as a solvent which is added to each halogenoalkane in separate test tubes

Silver nitrate is added to each individual test tube placed in water bath used to control the temperature

Equal amounts of ethanol used and concentration and quantity of halogenoalkane

Measure the time for the precipitate to form

Question 5

How is the apparatus for distillation is modified for efficient use?

Answer 5

Bulb of the thermometer should be opposite the condenser

The water in and out of the condenser should be reversed

Conical flask should be opened