Question
Need help with AP chemistry, specifically Acids and Bases
The acid ionization constant, Ka, for propanoic acid, C2H5COOH, is 1.3 10
-5
.
(a) Write the expression for the acid-dissociation constant, Ka for propanoic acid.
(b) Calculate the hydrogen ion concentration, [H
+
], in a 0.300 M propanoic acid.
(c) Calculate the percentage of propanoic acid molecules that are ionized in 0.300 M propanoic
acid.
The acid ionization constant, Ka, for propanoic acid, C2H5COOH, is 1.3 10
-5
.
(a) Write the expression for the acid-dissociation constant, Ka for propanoic acid.
(b) Calculate the hydrogen ion concentration, [H
+
], in a 0.300 M propanoic acid.
(c) Calculate the percentage of propanoic acid molecules that are ionized in 0.300 M propanoic
acid.
Answers
Let's call propanoic acid HP.
.........HP ==> H^+ + P^-
initial.0.3M.....0.....0
change...-x.......x.....x
equil....0.3-x....x......x
Ka = (H^+)(P^-)/(HP)
Substitute from the ICE chart above and solve for x = (H^+).
%ion = [(H^+)/(HP)]*100 = [(?H^+)/0.3]*100
Post your work if you get stuck.
.........HP ==> H^+ + P^-
initial.0.3M.....0.....0
change...-x.......x.....x
equil....0.3-x....x......x
Ka = (H^+)(P^-)/(HP)
Substitute from the ICE chart above and solve for x = (H^+).
%ion = [(H^+)/(HP)]*100 = [(?H^+)/0.3]*100
Post your work if you get stuck.
Related Questions
Ok, blonde moment here, Kb is the same as Ka but just for bases and Ka is for acids correct?
right....
A lab technician tests a 0.100 mol/L solution of propanoic acid and finds that its hydrogen ion conc...
propanoic acid ch3ch2cooh is a weak acid which has a value for dissociation content of ka = 6.3 x 10...
Propanoic acid is partly dissociates in water. If the concentration of the acid is 0.0025 M in the s...