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Electrolytic Dissociation

Outline the s...

Question

Outline the steps required to convert hydrogen chloride to anhydrous FeCl₃. Write equations for the reactions involved.

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Solution

Preparation of Hydrogen chloride occur in three steps which are as follows:
(1) Reaction of metal with Hydrogen chloride.

Fe (s) + 2HCl (aq) → FeCl₂ (aq) + H₂

(2) Oxidation of iron (II) chloride with chlorine.

2FeCl₂(aq) + Cl₂(g) → 2FeCl₃(aq)

(3) Refluxing of hydrated iron (III) chloride with thionyl chloride to convert into anhydrous iron (III) chloride.

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Q. Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.

Q. (a) Define the following terms:
(i) Acid
(ii) pH scale
(iii) Neutralisation.

(b) (i) Outline the steps that would be necessary to convert insoluble lead (II) oxide into insoluble chloride.
(ii) Write the balanced equations for the reaction required to convert insoluble lead (II) oxide into insoluble lead chloride.
(iii) If iron reacts with dilute sulphuric acid, what will be the products?
(iv) A solution of iron (III) chloride has a pH less than 7. Is the solution acidic or alkaline?

Explain why :

(a) It is necessary to find out the ration of reactants required in the preparation of sodium sulphate,

(b) Fused calcium chloride is used in the preparation of $F e C l_{3}$ ?

(c) Anhydrous $F e C l_{3}$ cannot be prepared by heating hydrated Iron (III) chloride.

Q. Write the equation for its laboratory preparing of hydrogen chloride gas mentioning the condition required.

Q. (a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(b) In the Contact process for the manufacture of the sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead, a two-steps procedure is used. Write the equations for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite to step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
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