Q. 114.2( 8 Votes )

Give reasons for

Answer :

(a) The Molar masses of macromolecules like polymers and protein are measured through osmotic pressure method.


The osmotic pressure method uses molarity of solution which has large magnitude even for dilute solutions, given that polymers have poor solubility, osmotic pressure measurement is used to determine their molar mass. Macromolecules such as protein are not stable at high temperatures, and measurement of osmotic pressure are done at room temperatures, it is useful for determination of molar masses of proteins.


(b) p =Kh * χ


Where Kh = Henry's law constant.


Solubility is indirectly proportional to Henry's constant.


As temperature increases, Kh increases; hence, solubility decreases.


Hence the availability of dissolved gas oxygen in water is at a lower temperature. Thus the aquatic animal feels more comfortable at lower temperatures than at higher temperatures.


(c)Since the elevation of boiling point is


TB = i× Kb× m


In both 1M KCl & 1M sugar. The solvent is the same, but KCl is ionic due to which it dissociates completely to K+ and Cl - ions. Hence the value can't Hoff factor is twice in 1M KCl then 1M sugar due to which elevation in boiling point is nearly double for 1M


As colligative property depends only on a number of particle and KCl as electrolyte will produce a double number of a particle of sugar.


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