Question

1. The relation between molarity and volume
strength is
1) Molarity=11.2 x volume strength
2) Volume strength=11.2 x molarity
3) Molarity= 22.4 x volume strength
4) Volume strength = 22.4 x molarity​

Answer 1

Answer:

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12th

Chemistry

Solutions

Expressing Concentration of Solutions

The strength of 11.2 volume...

CHEMISTRY

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Asked on October 15, 2019 by

Sonia Malhotra

The strength of 11.2 volume solution of H

2

O

2

is: [Given that molar mass of H=1gmol

−1

and O=16gmol

−1

]

HARD

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ANSWER

We know,

Volume strength =11.2× molarity =11.2

⇒ molarity =1M

⇒ strength =34g/L

⇒%w/w=

1000

34

×100=3.4%

Correct option: (B) 3.4%

Answer 2

The correct answer is option (2) Volume strength=11.2 x polarity

GIVEN

Volume strength Of H₂O₂

Molarity of solution.

TO FIND

Relationship between molarity and volume strength.

SOLUTION

We can simply solve the above problem as follows -

Volume strength is a term specifically used for Hydrogen peroxide solution.

It is defined as the volume of oxygen gas at STP produced when 1 Litre of a sample of Hydrogen peroxide is decomposed.

The reaction can be represented as -

∆

H₂O₂----------> 2H₂O + O₂

Let the molarity of H₂O₂ be, M.

Now, The solution of M moles of H₂O₂ is present in 1 liter of solution.

From the above reaction, we can say that:

2 Moles of H₂O₂ give 1 mole of oxygen.

Or,

2 Moles of H₂O₂ give 22.4 liters of oxygen at STP (Since, 1 mole = 22.4 Litres at STP)

1 Mole of H₂O₂ = 11.2 L of O₂

So, M moles of H₂O₂ = (11.2× M )L of O₂

1 Litre of H₂O₂ = (11.2 × M)L of O₂

1 Litre of H₂O₂ = volume strength.

Hence,

Volume strength = 11.2 × Molarity

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