Question

दिये गए M मोहर लवण के घोल की मदद से दिए गए KMnO, के घोल की मोलरता ज्ञ
Determine the molarity of the given KMnO, solution with the help of s
M M
Mohr's salt solution.
20
अथवा /OR
दिये गए M NaOH घोल की मदद से दिए गए HCI घोल की मोलरता अनुमापन वि
करें।
M
2
Determine the molarity of the given HCl solution by titrating against
अथवा /OR
दिये गए MH,SO, घोल की मदद से दिए गए Na,co, घोल की मोलरता अनुम
20
ज्ञात करें।
of supplied Na,Co, solution by titrati​

Answer 1

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Answer 2

Given: M/20 Mohr's salt solution

To find: Molarity of potassium permanganate solution

Step by step explanation:

The reaction of Mohr's salt with potassium permanganate is the classical example of oxidation- reduction titration  (Redox titration) where manganese ion is reduced from +7 oxidation state( pink color) to +2(colorless) by ferrous ion.

In this reaction, Mohr's salt (ferric ammonium sulphate) plays a role of reducing agent and it itself gets oxidized from ferrous ion to ferric ion.

Procedure:

• Prepare 100 ml of M/20 solution of Mohr's salt.
• Pipette out 50 ml of Mohr's salt in a clean conical flask and add a few drops of Sulphuric acid.
• Fill the burette with potassium permanganate solution of unknown concentration. Note the initial reading of burette.
• Titrate the solution until there is permanent pale color in conical flask. Note the volume of titrant consumed.

Calculations:

$M_{1}V_{1} = M_{2} V_{2}$

Volume of potassium permanganate: V1 (final reading in burette)

Concentration of potassium permanganate: M1

Volume of Mohr's salt: V2= 50 ml

Concentration of Mohr's salt: M2=0.05 M