Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.

Open in App

Solution

(a) Sodium hydrogen sulphate dissolves in water but does not produce a hydrogen ion. The reason there is a hydrogen ion is that $N a H S O_{4}$ (Sodium hydrogen sulphate) still has the acidic hydrogens left from the carbonic acid. This is why sodium hydrogen sulphate can donate a hydrogen ion when reacted with a strong base. For example, if sodium hydrogen sulphate reacts with sodium hydroxide, it produces sodium sulphate and water (which has got the hydrogen ion).

(b) The purpose of using desiccators is to absorb moisture. Anhydrous calcium chloride ((\CaCl_2\)) has a capacity of absorbing moisture as it is hygroscopic in nature, so it is used as a desiccators.

Suggest Corrections

Similar questions

Q. Hard water required for an experiment is not available in a school laboratory. However, the following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment :

(1) calcium sulphate
(2) sodium sulphate
(3) calcium chloride
(4) potassium sulphate
(5) sodium hydrogen carbonate
(6) magnesium chloride

Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment

(1) Calcium Sulphate

(2) Sodium Sulphate

(3) Calcium Chloride

(4) Potassium Sulphate

(5) Sodium Hydrogen Carbonate

(6) Magnesium Chloride

Q. 10 g of a mixture of sodium chloride and anhydrous sodium sulphate is dissolved in water. An excess of barium chloride solution is added and 6.99 g. of barium sulphate is precipitated according to the equation :-

N a_{2} S O_{4} + B a C l_{2} ⟶ B a S O_{4} + 2 N a C l

.
The percentage of sodium sulphate in the original mixture is:

[N a = 23, O = 16, S = 32, B a = 132]

10 g of a mixture of barium chloride and anhydrous sodium sulphate is dissolved in water. An excess of barium chloride solution is added and 6.99 g of barium sulphate is precipitated according to the equation given below:

Na₂SO₄ + BaCl₂ → BaSO₄ +2NaCl

[O = 16, Na = 23, S = 32, Ba = 137]

Calculate the percentage of sodium sulphate in the original mixture.

Write the balanced chemical equations for the following reactions-

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentration gives sodium chloride and sodium hydrogen carbonate.

(b) Sodium hydrogen carbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide.

(c) Copper sulphate on treatment with potassium iodide precipitates cuprous iodide $({Cu}_{2} I_{2})$ , liberates iodine gas and also forms potassium sulphate.

Join BYJU'S Learning Program

Give reasons for the following : (a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation NaHSO4⇌H++Na+SO2−4 (b) Anhydrous calcium chloride is used in a desiccator.

Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$N a H S O_{4} ⇌ H^{+} + N a^{+} S O_{4}^{2 -}$

(b) Anhydrous calcium chloride is used in a desiccator.