Question

2. DILUTION EFFECT ON THE PERCENT IONIZATION OF A WEAK ACID a. A weak acid, HX, is 1.3 % ionized in 0.20 M solution. What percent of HX is ionized in a 0.030 M solution? Show the complete setup. percent ionization b. From your result in (a) above answer the following questions: i) How did the percent of ionization change upon dilution? (increased, or decreased) ii) How did the [H,O') concentration of the above weak acid change upon dilution? (increased, or decreased) -11-

Answer 1

2 The formula we are using here, a = 1.3% - 3 C = 0.20 Putting values (7. 2 0 .20 3 Ka=31 3810-5 When c= 0.030m we have 200 22 0.035 L = 3.34 -/. Percent ionization 3.34 2. b) is with dilution The Rre percent conization with dil increased i) [H3ot) = ca Moot Concentration increased upon dilution.