Answer to Question #224802 in General Chemistry for sam

Question

3. Propanoic acid (CH3CH2COOH) is a weak organic acid with Ka = 1.3 x 10-5.

a) Calculate the pH of 200.0 ml of a 0.200 M solution of propanoic acid to which was added 5.00 g of sodium propanoate (CH3CH2COONa). Assume no volume change occurs. Briefly describe the properties of this solution.

b) Calculate the final pH if 0.011 mol of NaOH is added to the solution in part a). Again, assume no volume change.

4. A 25.0 mL sample of 0.35 M HCOOH, formic acid, is titrated with 0.20 M KOH. What is the

pH of the solution at the equivalence point of titration?

Given the Ka of HCOOH = 1.77 x 10-4.

5. Some SO2 and O2 are mixed together in a flask at 1100 K in such a way that, at the instant of

mixing, their partial pressures are 1.00 and 0.500 atm, respectively. When the system

comes to equilibrium at 1100 K, the total pressure in the flask is found to be 1.35 atm.

Calculate Kp at 1100 K for the reaction:

2 SO2(g) + O2(g) 2SO3(g)

Answer 1

3.a)pH=4.78

b) Final pH=5.63

4)pH of the solution=7.5

5)At 1100 K, $K_p=0.25$