Question

Which of the following methods can be used to obtain sodium chloride from a solid mixture containing sodium chloride and ammonium chloride?

A. heating
B. adding water and filtering
C. adding sodium hydroxide solution and filtering
D. adding silver nitrate solution and filtering​

Answer 1

• option A. heating.

Step-by-step explanation:

The tables proportionate you physical properties, such as boiling points and solubilities of both sodium chloride and ammonium chloride.

Both substances are highly soluble in water, so they cannot be separated by adding water and filtering, because both will be dissolved.

The boiling point of sodium chloride is 1465°C while the boiling point of ammonium chloride is 520°C. That means that if you heat the mixture up to 520°C (a little bit higher may be) the ammonium chloride will become a gas while the sodium chloride will remain liquid. This way you will obtain all the sodium chloride from the mixture.

Adding sodium hydroxide solution and filtering (option c.) and silver nitrate solution and filtering (option d) are not good methods to separate the sodium chloride as chemical reactions will change the sodium chloride into other substances.