Problem: Calculate [OH-], [H+], and the pH of 0.20 M solution of the following amine.a. triethylamine [(C2H5)3N, Kb = 4.0 X 10 -4]

FREE Expert Solution
97% (452 ratings)
FREE Expert Solution

Equilibrium reaction:        (C2H5)3N(aq) + H2O(l) (C2H5)3NH+(aq) + OH-(aq)

Step 1: Construct an ICE chart for the reaction.

Step 2: Write the Kb expression and calculate for Kb.


Solids and liquids are not included in the expression

Step 3: Calculate the equilibrium concentrations.


[C2H53N]initialKb=500; cannot ignore -x

4.0×10-4 (0.20-x)=x20.20-x(0.20-x)8.0×10-5-(4.0×10-4)x=x20=x2+(4.0×10-4)x-8.0×10-5


97% (452 ratings)
Problem Details

Calculate [OH-], [H+], and the pH of 0.20 M solution of the following amine.

a. triethylamine [(C2H5)3N, Kb = 4.0 X 10 -4]

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Bases concept. If you need more Weak Bases practice, you can also practice Weak Bases practice problems .

How long does this problem take to solve?

Our expert Chemistry tutor, Rae-Anne took 12 minutes to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Abbasi's class at BC.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in . You can also practice practice problems .