Not that I really need this now, but in Chemistry A-Level, I never understood what the equivalence point was on an acid base titration, when its NOT strong acid/strong base.
Surely if an acidic or basic salt can be made, that means H+ isn't = OH-
So what would a definition be?
Thank God they didn't ask me this in the exam :D
2006-07-19 05:06:37 · 5 answers · asked by snowpatrol161 2 in Science & Mathematics ➔ Chemistry
Look at:
http://en.wikipedia.org/wiki/Equivalence_point
http://en.wikipedia.org/wiki/Titration
it explains it perfectly
Equivalence point occurs during a chemical titration when the amount of titrant added is equivalent, or equal, to the amount of analyte present in the sample
The equivalence point of a titration does not mean that the solution has reached pH 7; merely that all the initial reactants have been reacted. The actual pH of the solution at equivalence point is determined by considering the acidity or basicity of the aqueous product of the reaction, most commonly by the Bronsted-Lowry Theory of acids and bases.
For monoprotic acids it is pH=2*pKa.
For polyprotic you have one for each acidic group pH1=2*pKa2, pH2=2*pKa2, etc
For bases pH=2*pKb
2006-07-19 05:33:51 · answer #1 · answered by bellerophon 6 · 0⤊ 0⤋
The equivalence point is the point where there is an equal amount of acid and base (in an acid-base titration). The pH at this point is not necessarily 7 but depends on the relative equilbrium constants of the acid and base. The end point is when you stop adding your titrant usually when your indicator changes color. An indicator is used to let you know when you have reached a specific pH.
2016-03-26 23:54:40 · answer #2 · answered by Anonymous · 0⤊ 0⤋
the equivalence point of any titration is when all the acid or base has been neutralized and you are left with only salt and water.
2006-07-19 08:32:27 · answer #3 · answered by The Frontrunner 5 · 0⤊ 0⤋
First.. salts are neither acids nor bases.... salts are the result of "spectator ions" forming ionic bonds ... say... HCl + NaOH... H20 is formed from the Hydrogen and hydroxide where NaCl forms the salt that carries no acidity or basicity.... equivalence is when OH- = H+
2006-07-19 05:15:00 · answer #4 · answered by Elise 1 · 0⤊ 0⤋
it's the same thing. the equivalence point is just that when the acid and base neutralize each other. the overall curve looks different with different acid and base strengths.
2006-07-19 06:42:41 · answer #5 · answered by shiara_blade 6 · 0⤊ 0⤋
the equivalence point is when acid and base neutralise one another, product you get is H2O and salt.
2006-07-20 05:30:54 · answer #6 · answered by girasole_lunatico 2 · 0⤊ 0⤋
it's when [H+]=[OH-] the square backets mean concentration of the H+ ions is equal to the concentration of the OH- ions
2006-07-19 15:01:35 · answer #7 · answered by zebbedee 4 · 0⤊ 0⤋