What are the applications of adsorption in chemical analysis?

A house wife while working in the kitchen gots a cut on the finger. It started bleeding and become panicked. She immediately called her neighbour.She had kept ferric chloride in her house. She immediately applied it on the affected area and the bleeding stopped.
(i) What is the chemical formula of ferric chloride?
(ii) Why did bleeding stop on applying it on the affected finger?
(iii) What is the name of the phenomenon involved?
(iv) What do we learn from it? What is the value associated with this from the point of view of chemist?

Radha and Meera are fast friends. They both study in class XII.Radha is a student of science while Meera follows commerce stream. One day, when they were playing, Radha got hurt and started bleeding. Meera took her to house and applied some alum on the cut. The bleeding stopped immediately.
(i)Why bleeding stopped when some alum is applied on the cut?
(ii) What are the values associated with Meera's decision to take Radha to her house and apply alum on her cut?

Reetu is purely vegetarian but her husband Rohit likes non-vegetarian food. He regularly buys nonvegetarian goods (fish, meet, eggs etc.) and store these in fridge. The intermixing of odours creates problem for Reetu. Their daughter Rihana is a student of science. One day Rihana suggested her mother to put some small pieces of charcoal in the fridge as she thinks that this will solve the problem to some extent.
(i) Do you think by putting some small pieces of charcoal in the fridge will solve the problem of intermixing of odours. Give reason for your answer.
(ii) What are the values associated with Rihana's suggestion?

On visit to your native village, you find that lot of smoke, dust and some other gases are coming out of the chimney of a recently set up factory near the village.
(i) As a chemistry student, what method you will suggest the factory owner to manage dust and smoke?
(ii) What is the basic principle involved in your suggestion?
(iii) What values are associated with your advice?

Shivam and Sudesh are two workers of Coal India Ltd. Ghato Phase-II. They go to their work with a mask and before going inside the coal mines, they wear the mask.
Answer the following questions:
(i) Why do they use the mask?
(ii) What is the process involved in working of mask?
(iii) What is the material used in manufacturing the mask?
(iv) What values do you obtain from use of mask in coal mines?

Surface chemistry deals with phenomenon that occurs at all the surface or interfaces. Many important phenomenon- corrosion electrode process, heterogeneous catalysis, dissociation, adsorption, crystallisation occur at the interfaces.
Answer the following questions:
(i) Why do we use charcoal, in gas masks, in coal mines?
(ii) How is animal charcoal, used in the decolourisation of sugar?
(iii) What is the use of silica gel which is given alongwith camera and other electronic equipments?
(iv) There is safety lamp in coal mines. What is its purpose?

Mamta's baby was suffering from fever. She consulted a doctor who prescribed, some medicines. She added boiled water to the medicine and then cooled water as per the instruction to the content of the bottle upto the mark. She shook the bottle, then gave a spoonful of the medicine to the baby
Answer the following questions:
(i) Why did she shake up the contents?
(ii) What is the name of process of agitation?
(iii) What is the particle range of solution obtained after shaking the medicine?
(iv) What is the value associated with selling medicine in this form?

Shyam living in Shimla, was washing clothes in cold water. He found that the clothes were not getting clean. Sneha, his grandmother, suggested that he wash the clothes in warm water, Washing of clothes with soaps or detergents is easier in luke warm water than cold water.
Answer the following questions:
(i) Why is it easier to wash the clothes in luke warm water?
(ii) What values are associated with these information?

A one  - litre vessel contained a gas at 27^oC. 6 g of charcoal was introduced into it. The pressure of the gas fell down from 700 mm to 400 mm. Calculate the volume of the gas (at S.T.P) adsorbed per gram of charcoal. Density of charcoal sample used was 1.5 g cm^-3 .

1 g of charcoal adsorbs 100 ml of 0.5 M CH₃COOH to form a monolayer, and thereby the molarity of CH₃ COOH reduces to 0.49 M. Calculate the surface area of the charcoal adsorbed by each molecule of acetic. Surface area of charcoal = \(3.01\times { 10 }^{ 2 }{ m }^{ 2 }g\)

20% of surface sites are occupied by N₂ molecules. The density of surface sites is \(6.023\times { 10 }^{ 14 }\) cm^-2 and total surface area is 1000 cm² . The catalyst is heated to 300 K while N₂ is completely disorbed into a pressure of 0.001 atm and volume 2.46 cm³. Find the active sites occupied by each N₂ molecule.

In an adsorption experiment, a graph between log (x/m) versus log P was found to be linear with a slope of 45^o. The intercept on the log (x/m) axis was found to be 0.310. Calculate the amount of the gas adsorbed per gram of charcoal under a pressure of 0.5 atmosphere.

The volume of nitrogen gas v_m (measured at S.T.P) required to cover a sample of silica gel with a mono - molecular layer is 129 cm³g^-1 of gel. Calculate the surface area per gram of the gel if each nitrogen molecule occupies \(16.2\times { 10 }^{ -20 }{ m }^{ 2 }\).

An emulsion is a colloidal dispersion in which both the dispersed phase and the dispersion medium are liquids. (The two liquids involved are otherwise immiscible).