Chemistry › Laboratory and Applications

Separation and purificationBasic

10-question practice

You can practise without an account, but mistakes are only saved after you log in. Log in

Question 1 of 8

Crude brine contains impurity ions such as

\mathrm{Ca^{2+}}

\mathrm{Mg^{2+}}

and

\mathrm{SO_4^{2-}}

. Excess

\mathrm{BaCl_2}

solution, excess

\mathrm{NaOH}

solution and excess

\mathrm{Na_2CO_3}

solution are added in this order; after filtration, an appropriate amount of hydrochloric acid is added to the filtrate. What is the role of the

\mathrm{Na_2CO_3}

solution? ( ).

Submit your answer to see whether it is right and the explanation here.