🤓 Based on our data, we think this question is relevant for Professor Jones' class at University of Guelph.
Aniline, C6H5NH2, is a weak base that dissociates in water. At 25 °Celsius, the base dissociation constant, Kb , for aniline is 4.3 x 10 -10.
(A) Determine the hydroxide ion concentration and the percentage dissociation of a 0.150 molar solution of aniline at 25 °Celsius.
We’re being asked to calculate the equilibrium concentration of the hydroxide ion (OH-) in a 0.150 M C6H5NH2 solution.
To solve this problem, we need to:
Step 1. Determine the dissociation of the base in water.
Step 2. Construct the ICE chart.
Step 3. Determine the equilibrium concentration of OH-
Step 1. Since C6H5NH2 has a low Kb value, it’s a weak base. Remember that weak bases partially dissociate in water and that bases accept H+ from the acid (water in this case). The dissociation of C6H5NH2 is as follows: