11. Calculate the osmotic pressure of a 1 M solution of NaC a. I atm b. 22.4 atm

Question

11. Calculate the osmotic pressure of a 1 M solution of NaC a. I atm b. 22.4 atm e. 11.2 atm d. 44.8 atm e. 5.6 atm 12. Calculate the pKa of a weak base with Ks value of 3.1 x 104 a. 3.22 x 10" b. 8.49 9.67 d. 5.51 e 7.56 c. 13. Which is the correct expression for calculating the molarity of water in aqueous solutions? a. 18g/1000g b. 1000g/9g . 10xS5.5 d. 1000g/18g e. 10-14/1000g 14. heat of v tion of water is: 0 cal /g 125 cal/g 263 cal/g 59 calg 263 cal/ 16.-19. Identify the following from the list 15. 16. 17. 18. 19. Acid Base Conjugate acid of the base Conjugate base of the acid What ionic species would predominate for the solution of ammonia at pH 11? 20. Calculate the OH ion concentration (M) in a solution having the pH value of 4. a. 10'M b. 0.6 x 10 c. 1010 1.2x 10-10 e. 10* 21. The energy which is required to start the reaction to an equilibrium state is named: a. standard free energy b. free energy of the reaction c. activation energy d. entropy e. enthalpy 22. The maximum useful work that a reaction could perform at constant temperature and pressure, and depends on the displacement of the system from equilibrium is called: a. free energy b. entropy c. enthalpy d. heat content e. first law of thermodynamics 23. The measure of the randomness or orderliness of the energy and matter in

Explanation / Answer

Ans 11

Molarity = 1 M

NaCl gives Na+ and Cl- ions

Van't Hoff factor i = 2

Temperature T = 273 K

Osmotic pressure = i x M x R x Temperature

= 2 x 1 mol/L x 0.0821 L-atm/mol-K x 273K

= 44.8 atm

Ans 12

Ka = 3.1 x 10^-6

pKa = - log Ka = - log (3.1 x 10^-6)

= 5.51

Ans 13

Molarity of water = moles of water / L of solution

= 18g x 1000 / m3

= 18 g x 1000 / 1000 kg

= 18 g / kg

= 18 g / 1000 g

Ans, 14

Heat of vaporization of water = 540 cal/g

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