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Hydrogen Peroxide

Glittering white teeth gives charming personality. Hence teeth whitening has grown in popularity in recent years, owing to the increased availability of products on the market.

However, a lot of these solutions can be fairly pricey, which prompts consumers to search for less-priced treatments.

Therefore, the primary component of most teeth-whitening products, hydrogen peroxide, is the cheapest method at home for dazzling teeth whitening.

What you need to know is this; The majority of bottles of hydrogen peroxide you may purchase at a drugstore or grocery shop are diluted to about 3 per cent. Could you determine how much hydrogen peroxide is present in this three per cent volume of solution? If not, let's explore.

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Table of Contents

  • Hydrogen Peroxide
  • Volume Strength of Hydrogen Peroxide
  • Practice Problems
  • Frequently Asked Questions

Hydrogen Peroxide

Chemically, hydrogen peroxide has the formula H2O2. It is a very light blue liquid when it is pure, somewhat more viscous than water.

Characteristics of Hydrogen Peroxides

  1. For consumer use, it is typically diluted in water and used as an oxidant, bleaching agent, and antiseptic.
  2. The simplest peroxide and a reactive oxygen species with an oxygen-oxygen single bond is hydrogen peroxide.
  3. When it is exposed to light, it steadily deteriorates. It is normally kept in a dark bottle with a stabiliser in a weakly acidic solution.
  4. In biological systems, including the human body, hydrogen peroxide is present.

Volume Strength of Hydrogen Peroxide

In all ratios, H2O2 and water can be mixed to form a hydrate of H2O2.H2O

Volume is a typical method for expressing the strength of hydrogen peroxide. This is a reference to the amount of oxygen that an H2O2 solution will produce.

In the case of hydrogen peroxide, a "20 volume" means that 1 L of this solution will produce 20 L of oxygen at N.T.P or 1m L of this solution will produce 20mL of oxygen at N.T.P.

Now, If we want to calculate the amount of Hydrogen peroxide in 20 Volume,

Follow these steps

(i) Decomposition of Hydrogen peroxide can be written as

2H2O2l2H2Ol+O2g

68 g                                  22.7 L

1 mole of O2(g) = 22.7 L or 32 g

1 mole of H2O2(l) = 22.7 L or 34 g

2 moles of H2O2(l) = 45.4L or 68 g

(ii) Mole Concept

1 mole of O2(g)is formed on the decomposition of 2 moles of H2O2(l)

22.7 L of O2(g) is formed on the decomposition of 68 g of H2O2(l)

1 L of O2(g) is formed on the decomposition of = 68 g22.7 L of H2O2(l)

20 L of O2(g) is formed on the decomposition of = 68 g22.7 L×20 L of H2O2l=59.9 g of H2O2l

Hence, 20 volume contains 59.9 g or 60 g of H2O2(l).

(iii) Strength of H2O2(l) in 20 volume of 1L solution

Strength = 60 g1 L = 60gL

(iv) % Strength of H2O2(l) in 20 volume of 1L solution

% Strength = 60g1000mL×100 = 6 %


Practice Problems

Q1. Calculate the volume of O2(g) in 3% solution of Hydrogen Peroxide.

A. 3 L
B. 30 L
C. 10 L
D. 15 L

Answer: (C)

Solution: 3% solution of Hydrogen Peroxide means the strength of the solution is 30gL

Hence, it is given that 30 g of Hydrogen peroxide is present in 1L of solution.

Decomposition of Hydrogen peroxide can be written as

2H2O2l2H2Ol+O2g

68 g                               22.7 L

2 moles of H2O2(l) decompose to give 1 mole of O2(g)

68 g of H2O2(l) decompose to give 22.7 L of O2(g)

1 g of H2O2(l) decompose to give = 22.7 L68 gof O2(g)

30 g of H2O2(l) decompose to give = 22.7 L68 g×30 g of O2g=10 L of O2g

Hence, the correct answer is option (C).

Q2. Calculate the volume strength of 3N H2O2(l) solution.

A. 17 volumes
B. 25 volumes
C. 51 volumes
D. Invalid information

Answer: (A)

Solution: 3N means 3 gram equivalents of H2O2(l) is present in 1L of solution.

Equivalent Weight of H2O2(l) = Molar Mass2 = 342 = 17 g

Gram Equivalents =WeightEquivalent Weight

Weight =Gram Equivalents ×Equivalent Weight 

Weight of H2O2l=3×17 =51 g 

Decomposition of Hydrogen peroxide can be written as

2H2O2l2H2Ol+O2g

68 g                  22.7 L

2 moles of H2O2(l) decompose to give 1 mole of O2(g)

68 g of H2O2(l) decompose to give 22.7 L of O2(g)

1 g of H2O2(l) decompose to give = 22.7 L68 g gof O2(g)

51 g of H2O2(l) decompose to give = 22.7 L68 g×51 g of O2(g) = 17 L of O2(g)

1 L of this solution will produce 17 L of oxygen at N.T.P, hence the volume strength of H2O2(l) is 17 volumes

Hence, the correct answer is option (A).

Q3. Calculate the weight of H2O2(l) present in 25 volumes of H2O2(l).

A. 25 g
B. 50 g
C. 64 g
D. 75 g

Answer: (D)

Solution: 25 volume means that 1 L of this solution will produce 25 L of oxygen at N.T.P.

Decomposition of Hydrogen peroxide can be written as

2H2O2l2H2Ol+O2g

68 g                          22.7 L

1 mole of O2(g)is formed on the decomposition of 2 moles of H2O2(l)

22.7 L of O2(g) is formed on the decomposition of 648g of H2O2(l)

1 L of O2(g) is formed on the decomposition of = 68 g22.7 L of H2O2(l)

25 L of O2(g) is formed on the decomposition of = 68 g22.7 L×25 L of H2O2(l) = 74.9 g or 75 g of H2O2(l)

Hence, 20 volume contains 75 g of H2O2(l).

The correct option is (D).

Q4. A KI solution that has been acidified can release 1 g of iodine when 1.34 mL of H2O2(l) is added. Calculate the volume strength of H2O2(l) solution at STP.

A. 33 Volumes
B. 3.3 Volumes
C. 4.48 Volumes
D. 0.33 Volumes

Answer: (A)

Solution: H2O2(l) reacts with acidified KI solution as

2KI+H2SO4+H2O2K2SO4+I2+2H2O

3.4 mL                                   1g

254 g of I2 liberates = 34 g of H2O2

1 g of I2 liberates= 34 g254g= 0.134 g of H2O2

1.34 mL of H2O2(l) contains = 0.134 g

1 mL of H2O2(l) contains = 0.134 1.34=0.1 g

Decomposition of Hydrogen peroxide can be written as

2H2O2l2H2Ol+O2g

68 g                              22.7 L

2 moles of H2O2(l) decompose to give 1 mole of O2(g)

68g of H2O2(l) decompose to give 22.7 L of O2(g)

1 g of H2O2(l) decompose to give = 22.7 L68 gof O2(g)

0.1 g of H2O2(l) decompose to give = 22.7 L68 g×0.1 g of O2(g) = 0.033 L of O2(g)

Hence, 1 mL of H2O2(l) contains 0.033 L of O2(g)

Also, 1 mL of H2O2(l) contains 33 mL of O2(g)

Volume Strength = 33 Volumes


Frequently Asked Questions

Q1. Where in your daily life can you find hydrogen peroxide?
Answer:
Hydrogen peroxide functions as an oxidising ingredient in personal care and home goods like toothpaste, mouthwash, bathroom cleaners, and laundry stain removers, providing a lightening and whitening effect.

Q2. How could hydrogen peroxide affect a person's body?
Answer:
Hydrogen peroxide is unlikely to result in chronic toxicity because it breaks down quickly in the body. However, repeated inhalations of hydrogen peroxide fumes in chemistry labs may result in chronic respiratory tract irritation and partial or total lung collapse.

Q3. What is the purpose of hydrogen peroxide in medicine?
Answer:
For minor burns, scrapes, and wounds, hydrogen peroxide is a gentle antibacterial that can be applied directly to the skin. Additionally, it can be used as a mouthwash to assist clear mucus or soothe mild oral irritation. Additionally, it is utilised as a nasal spray and to remove earwax.

Q4. Is blood a stain that hydrogen peroxide can remove?
Answer:
Unfortunately, they are, and for this job, something more powerful than soap and water is frequently required. The best technique is to employ hydrogen peroxide, an oxidising substance that breaks down and eliminates old blood stains through a chemical reaction.


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