12th Chemistry Practical No. 2 ~ To Determine The Concentration in Term of Molarity of KMnO4 Solution by Titrating it...

 12th Chemistry practical book answers pdf Maharashtra board

~ To Determine The Concentration in Term of Molarity of KMnO4 Solution by Titrating it...

Questions

Q1. What specific name is given to the permanganate

Titrations​?

Redox titrtion is a specific name is given to the permanganate titrations​.

Q2. Why heating is not required in F.A.S. and potassium parmanganate titration?

In this titration heating of ferrous ammonium sulphate solution is not required because reaction rate is very high even at room temperature.

3. Why is dilute sulphuric acid added while preparing a standard solution of Mohr's salt?

Dilute sulphuric acid is added to prevent the hydrolysis of ferrous sulphate. For dissolving the mixture of salts in water excessive heating is avoided. This is for the prevention of Fe2+ ions (light green) to Fe3+ ions (yellow).

Q4. Calculate the molar mass of Mohr's salt (Fe = 56, S = 32, N = 14, H = 1, 0 = 16)

Mohr's salt has molecular formula - (NH4)2Fe(SO4)2·6H2O.

(14+4)*2 +56 +(32+4*16)*2 + 6*(2+16)

=18*2 + 56 + 96*2 + 6*18

=36 + 56 + 192 + 108

Molar mass = 392g

Click Here for PDF: Google Drive