Home
Class 12
CHEMISTRY
A sample of FeSO(4).7H(2)O crystals has ...

A sample of `FeSO_(4).7H_(2)O` crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total `250 cm^(3)` water and dilute sulphuric acid. `25cm^(3)` portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was `0.1"mol"dm^(-3)`. The averge volume used was `23.5cm^(3)` o.2 mol `dm^(-3)`. The average volume used to `23.5cm^(3)`.
The percentage purity of the cyrstal is

A

0.84 gm

B

0.90 m

C

0.77 gm

D

0.62 gm

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

If 250 ml of 0.25 M NaCl solution is diluted with water to a volume of 500 ml, the new concentration of solution is:

A solution is prepared by dissolving 0.63 g of oxalic acid in 100 cm^(3) of water. Find the normality of the solution.

In aqueous solution concentration of H^(+) ions is 10^(-4) mol/1. If equal volume of water is added to the solution, then the concentration of OH^(-) ion in mol/ dm^(3) is

How is the concentration of hydronium (H_(3)O^(+)) ions affected when a solution of an acid is diluted?

A dilute solution of HCI contains [H3O^(+)] - 5.4 xx 10^(-5) " mol " L^(-1) at 298 K. What is the concentration of hydroxyl ions in this solution?

A sample of sodium carbonate contains impurity of sodium sulphate. 1.25 g of this sample are dissolved in water and volume made up to 250 mL. 25 mL of this solution neutralise 20 mL of N/10 sulphuric acid. Calculate the percentage of sodium carbonate in the sample.

1.325 g of anhydrous sodium carbonate are dissolved in water and the solution made up to 250 mL. On titration, 25 mL of this solution neutralise 20 mL of a solution of sulphuric acid. How much water should be added to 450 mL of this acid solution to make it exactly N/12 ?

The mass of potassium dichromate crystal required to oxidise 750 cm^(3) of 0.6 M Mohr's salt solution is (molar mass=392)

The volume of 2N H_(2)SO_(4) solution is 0.1dm^(3) . The volume of its decinormal solution (in dm^(3) ) will be

5 gm of K_2 SO_4 solution were dissolved in 250 ml of water. How many ml of this solution are needed to precipitate out 1.2 gm of BaSO_4 on addition of BaCI_2 ?