QUIZ # 4, Chapter -15
ID # Name: Date:
Attempt all questions.
[3]
Q.1 a) Calculate the pH of 0.100 M propionic acid (HC3H5 O2 )
and % dissociation of the acid. Ka = 1.3 x 10-5
b) The common ions will drive the equilibrium towards ……………..
and decrease the dissociation of ………………
[3]
Q.2. Calculate the pH a mixture containing 0.100 M of HONH2 and 0.100 M of HONH3Cl (weak acid) Kb = 1.1 x 10-8.
[4]
Q. 3. a) Calculate the pH of buffer solution after addition of 0.02 mol of HCl to 1.00 L of a solution of 5.00 M HC2H3O2, and 5.00 M of NaC2H3O2.
Ka = 1.8 x 10-5
b) A buffer solution is made by dissolving NH4Cl
and NH3 in H2O . Write equation to show how this buffer neutralized
added H+ and