Asked by timmy
methylamine is a weak base. calculate the pH of a .025 M solution of methylamine.
Answers
Answered by
DrBob222
..........CH3NH2 + HOH --> CH3NH3^+ + OH^-
I..........0.025............0..........0
C...........-x..............x..........x
E........0.025-x............x..........x
You need the Kb for CH3NH2. You can find that in your text/notes/web.
Substitute the E line into Kb expression and solve for x = (OH^-) and convert that to pH. You may need to solve for quadratic depending upon how close your prof wants the answer.
I..........0.025............0..........0
C...........-x..............x..........x
E........0.025-x............x..........x
You need the Kb for CH3NH2. You can find that in your text/notes/web.
Substitute the E line into Kb expression and solve for x = (OH^-) and convert that to pH. You may need to solve for quadratic depending upon how close your prof wants the answer.
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