Post by: hard on August 03, 2008, 04:09:33 pm
The basic concept is knowing which hydrgen gives, and which one takes making the acids and baeses.
let's look at this question.
Q1 . what is the conjugate acid of the following pair.
a) O^2-
solution
O^2-(aq) + H2O(l) --> OH(aq)^- + OH^-(aq
however, because the water has more hydrogen atoms, wouldn't you expect the equation to stay the same since there are no hydrogen atoms attached to the lone oxygen atom. Can you please explain why this is so?
Also one last question.
Q2. show that the reaction between a solution of sodium hydroxide and a solution of hydrochloric acid is a bronsted - lowry acid-base reaction.
Also one last thing, can you please explain to me, how do you know which atom in the equation receicve or give the hydrogen atom. thanks.
Post by: Jeffree on August 03, 2008, 07:47:08 pm
Post by: hard on August 03, 2008, 08:35:08 pm
Post by: bturville on August 04, 2008, 11:14:39 pm
remember: to find the conjugate acid of something, you add H+ to the formula...and to find the conj base you remove H+ from the formula.
as for knowing whats an acid and what is a base, at the VCE level they pretty much only give you compounds that you will recognize, ie common bases and acids, carboxylic acids, etc. working out how acidic/basic a molecule is from the structure alone is a fair bit of work without more info, they won't put you through that.
Post by: hard on August 05, 2008, 06:34:46 pm