State Henry’s law and mention some important applications?

State Henry’s law and mention some important applications?

Answer:-

Henry’s law :-

According to Henry’s law the solubility of gas in a liquid is directly proportional to the pressure of the gas

Mathematically

 mass of the dissolved gas  α  pressure of the gas

let mass of dissolved gas in unit volume            = m

pressure of gas                                                 = p

to remove sign of proportional we us a constant

here  KH is Henry’s law constant

so we get

m = K_H*p                            …………….(1)

we can measure mass of solute in term of molar fraction also

Hence our formula will

X = K_H*p                              …………. (2)

And we can write as

The partial pressure of the gas in vapour phase p is  proportional to the mole fraction of the gas x in the solution.

Importance of this Law :-

(1)     In Packing of soda cans :- To increase the solubility of CO2 gas in soda water , bottles of soda water is always packed under higher pressure. 

(2)     In Deep see diving: - As nitrogen is a more soluble gas in our blood and at deep see pressure increase so its solubility also increases, when scuba diver tries to come rapidly toward the surface of water, pressure decreased and Dissolved N2 gas comes back from the blood and make bubbles in his veins. It because bends .To avoid bends diver use oxygen diluted with helium because helium is less soluble in blood.