Define the following modes of expressing the concentration of a solution. Which
of these modes are independent of temperature and why?(i) w/w (mass percentage) (v) x (mole fraction)(ii) V/V (volume percentage) (vi) M (Molarity)(iii) w/V (mass by volume percentage) (vii) m (Molality)(iv) ppm. (parts per million)EXPLAIN IN DETAIL.

Open in App

Solution

$(i) m a s s p e r c e n t a g e (w / w) = \frac{m a s s o f s o l u t e}{m a s s o f s o l u t i o n} x 100 % (i i) V o l u m e p e r c e n t a g e (V / V) = \frac{v o l u m e o f s o l u t e}{v o l u m e o f s o l u t i o n} x 100 % (i i i) m a s s b y v o l u m e p e r c e n t a g e (m / V) = \frac{m a s s o f s o l u t e}{V o l u m e o f s o l u t i o n} x 100 % (i v) p a r t s p e r m i l l i o n (p p m .) = \frac{n u m b e r o f p a r t s o f a c o m p o n e n t}{t o t a l n u m b e r o f p a r t s o f a l l t h e c o m p o n e n t s i n t h e s o l u t i o n} x 10^{6} (v) m o l e f r a c t i o n = \frac{n u m b e r o f m o l e s o f a c o m p o n e n t}{t o t a l n u m b e r o f m o l e s o f a l l t h e c o m p o n e n t s} (v i) M o l a r i t y (M) = \frac{n u m b e r o f m o l e s o f s o l u t e}{v o l u m e o f s o l u t i o n i n l i t r e s} (v i i) M o l a l i t y (m) = \frac{n u m b e r o f m o l e s o f s o l u t e}{m a s s o f s o l v e n t i n k i l o g r a m s}$

Out of these, mass%, mole fraction, ppm and molality are independent of temperature because number of moles of a component and mass of solution or solvent doesnot change with temperature. Whereas, molarity is temperature dependent since volume is temperature dependent. The volume of most the substances increase with the increase in temperature. Hence, the quantities which are volume dependent depend on temperature also.

Suggest Corrections

Similar questions

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(a) w/w (mass percentage)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(b) V/V (volume percentage)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(c) w/V (mass by volume percentage)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(d) ppm (parts per million)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(e) x (mole fraction)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(f) M (molarity)

Define the following modes of expressing the concentration of a solution? Which of these modes are independent of temperature and why?
(g) m (molality)

Q. The weight percentage and volume percentage (w/v) of a solution are 22 and 44 respectively. What is the density of the solution?

Question 39
Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.

Q. The weight - volume percentage (w/v) of

10 V

H_{2} O_{2}

solution is:

Q. Calculate the percentage composition of the solute in % (w/w) present in a solution obtained by mixing 400 g of a 25% (w/w) solution and 500 g of a 40% (w/w) solution.

Join BYJU'S Learning Program