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# Volume strength of Hydrogen Peroxide - Definition, formula, practice problems & FAQs

Which chemical is the best bleaching agent for cotton fabrics, how their concentration is represented for commercial purposes, their dilute/varying concentration solution be used for various applications?

Hydrogen peroxide (H2O2) is the best bleaching agent for cellulosic material and for commercial purposes thor concentration is expressed as volume strength, w/v, etc. also, dilute solution of Hydrogen peroxide (H2O2) with different concentrations can be used for different applications like antiseptic, disinfectants, etc.

• Volume strength of hydrogen peroxide
• Derivation of formula of mathematical form of volume strength of H2O2
• n-factor of H2O2
• Practice problems

## Volume strength of hydrogen peroxide (H2O2)

Volume strength of H2O2 is represented as 30 V, 35 V, 20 V etc.

If a sample of H2O2 represented as 30 V H2O2 means one litre of this sample of H2O2 on decomposition gives 30 litre of O2 gas at S.T.P

## Derivation of formula of mathematical form of volume strength of H2O2

The balanced chemical reaction of decomposition of H2O2 can be represented as

(follows first order kinetics)

Molar mass of H2O2 = 34 g mol-1

According to given reaction,

we can say 1 mole of H2O2 produce 0.5 mole of O2

Means, 34 g H2O2 produce mole of O2

We know that 1 mole of any gas at STP occupies 22.7 L

Volume of mole of O2 atSTP = 11.3 L

34 g H2O2 produce mole of O2 at STP

34 g H2O2 produce 11.3 L of O2 atSTP

To produce, 11.3 L of O2 decomposition of 34 g H2O2 must be required

By definition number of equivalent of solute per litre of solution is known as normality of solution.

## n - factor of H2O2

n - factor = 2 | 0 - (-1) = 2

## Practice problems

Q1. A sample of H2O2 solution is labelled as 30.5 V. Calculate its strength of solution?

A. 92.65 g L-1
B. 30.5 g L-1
C. 11.2 g L-1
D. 87.89 g L-1

Solution: we know, Normality =

Normality = N=5.45 N

Strength of solution (g L-1) = normality equivalent mass =

Q2. The volume strength of a sample of H2O2 is ‘17 vol’. The mass of H2O2 present in 100 ml of this solution is

A. 0.67 g
B. 5.17 g
C. 9.7 g
D. 10.8 g

Q3. 100 mL of 2 N H2O2 and 150 mL of 20.5 V H2O2 solution are mixed then find the resulted normality of the solution?

A. 2.1 N
B. 3 N
C. 2.5 N
D. 1.9 N

Solution: volume of first solution = 100 mL

Normality of first solution = 2 N

volume of second solution = 150 mL

Volume strength of solution = 20.5 V

Q4. 20 V of H2O2 after acidification required 20 mL of 1.2 N K2CrO7 for complete oxidation. The volume required of H2O2 solution is

A. 10 mL
B. 6.72 N
C. 5.6 N
D. 11.2 N

Question 1. What is the commercial name of H2O2 as an antiseptic?
Answer: H2O2 as an antiseptic sold as the name of perhydrol.

Question 2. What is the structure of H2O2 in gas and solid phase?
Answer: H2O2 has open book structure and their dihedral angle is different in both phase

Question 3. Write some use of H2O2
Answer: H2O2 used as hair bleach, antiseptic, bleaching agent etc. Hydrogen peroxide is used to disinfect tools, bleach hair, and clean surfaces. It's also used in oral care and gardening. It may be discomforting to know that a touted skin treatment can also be used as a household cleaner

Question 4. Industrially H2O2 purchased in bulked quantity, So, what precaution should be taken for storage of H2O2?
Answer: Presence of metal or traces of metal can accelerate the decomposition of H2O2 so H2O2 stored in a vessel of plastic or vessel coated with wax. Urea used as a stabilizer for storage of H2O2.

Related Topics

 Molarity Molality Mole fraction Parts per million Oxidation Number Equivalent weight

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