Question

Answer the following question related to salt and their preparations.

a)What is salt?
b)What kind of salt is prepared by precipitation?
c)Name a salt prepared by direct combination. Write an equation for the reaction that takes place in preparing the salt you have named.
d)Name the procedure used to prepare sodium salt such as sodium sulphite.

Answer 1

a)Salt is a substance produced by the reaction of an acid with a base. It consists of the positive ion (cation) of a base and the negative ion (anion) of an acid.

b)Insoluble salts are prepared by the method of precipitation.

c)Ferric chloride can be prepared by the method of direct combination.

$2Fe\left(s\right)+3C{l}_2\left(g\right)\to 2FeC{l}_3\left(s\right)$

d)Sodium salt such as sodium sulphite can be prepared by neutralising sodium carbonate or sodium hydroxide with dilute sulphuric acid. ${\mathrm{Na}}_2{\mathrm{CO}}_3\left(s\right)+H_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)+H_{2}O\left(l\right)+{\mathrm{CO}}_2\left(g\right)$
$2\mathrm{NaOH}\left(\mathrm{aq}\right)+H_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)\to {\mathrm{Na}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)+2H_{2}O\left(l\right)$