Question

Which apparatus is used to keep copper sulphate from mixing water during crystallization?
(A) Test tube
(B) China dish
(C) Beaker
(D) Spatula

Answer 1

To answer this question, we first need to understand what copper sulphate is. Copper (II) sulphate is an inorganic molecule having the chemical formula $CuSO_4$ , where X can range from 0 to 5. The most frequent form is the pentahydrate. Blue vitriol, bluestone, vitriol of copper, and Roman vitriol are some of the older names for this chemical.

Complete answer:
Crystallization - Crystallization or crystallization is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas.
Copper sulphate is kept in a China dish for mixing with water during crystallization. The sample of impure copper sulphate is placed in a china plate. It dissolves in the smallest amount of water possible. Filtration is used to eliminate contaminants. The water in the copper sulphate solution is evaporated, resulting in a saturated solution. Filter paper is placed over the solution, which is then left at room temperature undisturbed. After a day, copper sulphate crystals form in a china dish.
So, we conclude that china dishes are used for crystallization of copper sulphate.
So, the final answer is option (B) i.e., china dish.

Note:
Crystallization is most commonly used as a separation process to separate pure crystals of a product from an impure mixture. Crystallization is also used to extract pure salt from saltwater, which is an essential use. Crystallization can also be used to separate impure alum crystals from pure alum crystals.