Aqueous solution of naoh is marked 10 percent w/ w the density of the solution is 1.070 g/ cm3 calculate molarity molality mol fraction of naoh in water
Answers
V=m/d
molarity=10×(1.07/4+90/18)
=1.89
Answer:
Molarity = 2.675 M
Molality = 2.777 m
Mole fraction (NaOH) = 0.0476
Mole fraction (H2O) = 0.9523
Explanation:
aqueous solution of NaOH is marked 10%(w/w). Dwnsity of solution is 1.070 gm/cm^3.
(i) Molarity -
Molarity = no of moles of solute / volume of soln
Molarity = (10/40) / (0.1÷1.07)
Molarity = 2.675 M
(ii) Molality -
Molality = no of moles of solute / mass of solvent
Molality = (10/40) / (0.090)
Molality = 2.777 m
(iii) Mole fraction of NaOH -
Mole fraction (NaOH) = moles of NaOH / total moles
Mole fraction (NaOH) = (10/40) / (10/40 + 90/18)
Mole fraction (NaOH) = 0.0476
(iv) Mole fraction of H2O -
Mole fraction (H2O) = moles of H2O / total moles
Mole fraction (H2O) = (90/18) / (10/40 + 90/18)
Mole fraction (H2O) = 0.9523