Understanding the weak base NH3 in water - please help.

by christian0710
Tags: base, water, weak
christian0710 is offline
Feb21-14, 10:34 AM
P: 156
Hi i have a general question concerning the behavior of a weak base NH3 in water.
If we have a reaction between a weak base and water

NH3 + H2O = NH4(+) + OH(-)

NH3 is a weak base with respect to the base ,OH(-), produced from water. This means that the lone pair of OH(-) will Attack a high procentage of the NH4+ that NH3 want’s to produce from water.

Is it correctly assumed that the weak base NH3 is actually competing against 2 bases in a water solution: It’s competing against OH because OH reacts with NH4+ but it also competes aginst water, because the following equilibrium must be true
NH4+ + H2O = H3O(+) + NH3
So actually NH4+ reacts with OH and H2O to form NH3…Correct?

A last question:
Is OH(-) a more reactive base than water? For instance if we have put a weak acid into water, would the OH(-) produced from waters autoinoization reaction prefer to attack the weak acid more than water itself?
Phys.Org News Partner Chemistry news on Phys.org
First view of nature-inspired catalyst after ripping hydrogen apart provides insights for better, cheaper fuel cells
Following a protein's travel inside cells is key to improving patient monitoring, drug development
Team helps cancer treatment drugs get past their sticking point

Register to reply

Related Discussions
Hydrolysis of salts of weak acid-weak base Chemistry 1
Weak Acid-Weak Base Equilibria Chemistry 1
pH of a solution of a weak acid and a weak base (not conjugates, not BHA [NH4CN]) Biology, Chemistry & Other Homework 3
pH problem weak acid and weak base Chemistry 2
Nuetralization Reaction involving a weak acid and weak base Chemistry 3