post lab discussion: exp. 5 Flashcards
briefly explain the type of reaction in titration
acid-base titration (acid-base reaction)
redox titration (electron transfer)
precipitation titration (formation of precipitate)
a technique where a solution of known concentration (titrant) is used to determine the unknown concentration of an identified analyte
titration
Titrant –
Analyte –
Titrant – the solution of known concentration (volume obtained by titration)
Analyte – the solution of unknown concentration (but known volume)
the point at which the moles of added titrant is stoichiometrically equal to the moles of analyte
equivalence point
signals the end of titration where in the indicator gives an observable change like sharp color change; located very close to the equivalence point
endpoint
Bronsted-Lowry Acids -
Bronsted-Lowry Base -
- Bronsted-Lowry Acids - proton/H+ donor
- Bronsted-Lowry Base - proton/H+ acceptor
Strong Acid/Base -
Weak Acid/Base -
Strong Acid/Base - completely dissociates with water
Weak Acid/Base - partially dissociates with water.
*dissociates = break apart/ releasing of ions
examples of strong acid and bases
strong acid: HCI, H2SO4, HBR, HNO3, HI, HCIO4
strong base: NaOH, KOH, LiOH
examples of strong acid and bases
weak acid: CH3COOF, HF, H#PO4, HSO4
weak base: NH3, pyridine, methylamine
is a procedure used in Quantitative Analysis to determine the concentration of either acid or baseis a procedure used in Quantitative Analysis to determine the concentration of either acid or base
acid-base titration
HCl + NaOH —–>
NaCl + H2O
in acid-base titration, the indicator should change sharply at _______
equivalence point
in acid-base titration, the end point of all acids/ bases are neutralised with acid/base, the flask contains ____ and ____ only
sodium chloride (salt)
water
are weak organic acids or bases that dissociates slightly in aqueous solutions to form ions
acid-base indicator
why does indicator changes color
as their ions have colors that are diff from undissociated molecule