CameraIcon

SearchIcon

MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Introduction

1.6 g of pyro...

Question

$1.6 g$ of pyrolusite was treated with $60 m L$ of normal oxalic acid and some $H_{2} S O_{4}$ . The oxalic acid left undecomposed was made up to $250 m L, 25 m L$ of this solution required $32 m L$ of $0.1 N$ potassium permanganate $(K M n O_{4})$ . Calculate the percentage of pure $M n O_{2}$ in pyrolusite.

Open in App

Solution

m.eq of "excess of oxalic acid" = $32 \times 0.1$ in $25 m l$
For $250 m L$ = $32 \times 0.1 \times \frac{250}{25} = 32 m e q$

Total oxalic acid used = $50 \times 1 = 50 m e q$

m. Eq of "oxalic acid used for $M n O_{2} = 50 - 32 = 18$
m. Eq of $M n O_{2} = 18$
Mass of $M n O_{2} = 18 \times 10^{- 3} \times \frac{87}{2} g o f M n O_{2}$ = $0.783 g$

% of $M n O_{2} = \frac{0.783}{1.6} \times 100 = 48.93$ % [Answer]

Suggest Corrections

thumbs-up

1

Similar questions

3.2 g

(M n O_{2})

was treated with

50 m L

0.5 M

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 m L

25 m L

of this solution when treated with

0.02 M K M n O_{4}

32 m L

of the solution. Find the percentage of

M n O_{2}

in the sample.
Given: Atomic mass of

M n

55 g m o l^{- 1}

1.6 g

of pyrolusite ore was treated with

50 c m^{3}

1.0 N

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 c m^{3}

25 c m^{3}

of this solution when titrated with

0.1 N K M n O_{4}

32 c m^{3}

of the solution. Find the percentage of pure

M n O_{2}

in the sample and also the percentage of available oxygen.

1.6

g of pyrolusite ore was treated with

50

0.1 N

oxalic acid and some sulphuric acid. The oxalic acid left in excess was raised to

250

25

mL of this solution when titrated with

0.01 N

K M n O_{4}

30

mL of the solution. The percentage of pure

M n O_{2}

in the sample is :

3.2 g

(M n O_{2})

was treated with

50 m L

0.5 M

oxalic acid and some sulphuric acid. The oxalic acid left undecomposed was raised to

250 m L

25 m L

of this solution when treated with

0.02 M K M n O_{4}

32 m L

of the solution. Find the percentage of

M n O_{2}

in the sample.
Given: Atomic mass of

M n

55 g m o l^{- 1}

1.17 g

of an impure sample of oxalic acid was dissolved and made up to

200 m L

10 m L

of this solution in acid medium required

8.5 m L

of a solution of potassium permanganate containing

3.16 g p e r l i t r e

of oxidation. Calculate the percentage purity of oxalic acid.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Introduction to Surface Chemistry

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon