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Titration Notes, Titration Notes, part Ipart INeutralization ReactionsNeutralization Reactions
NeutralizationA reaction in which an acid and a
base in aqueous solution produces a salt and water.
What is a salt?An ionic compound made from the
cation of a base and the anion of an acid.
Neutralization ReactionsNaOH + HCl NaOH + HCl
KOH + HKOH + H22SOSO44
Lithium hydroxide neutralizes nitric Lithium hydroxide neutralizes nitric acidacid
Phosphoric acid neutralizes calcium Phosphoric acid neutralizes calcium hydroxidehydroxide
Titration ReactionsYou can use a neutralization
reaction to determine the concentration of an acid (or base) solution…
……using stoichiometry!!!using stoichiometry!!!
IndicatorsIn order to do so, you need an
indicator—a dye that changes colors at different pH
In most titrations, phenolphthalein is used, because it turns from colorless to bright pink as a solution goes from acidic to basic.
How Do You Titrate?1) A measured amount of acid
solution of unknown concentration is added to a flask.
2) Indicator is added to the acid.3) Measured volumes of a base of
known concentration are added until the indicator barely changes color.
Titration TermsA A buretburet is the device that we is the device that we
use for measuring volumes use for measuring volumes in a titration.in a titration.
Titration TermsThe standard solution is the solution
of known concentration added in step #3.
Titration TermsThe endpoint is the point at which
the indicator changes color.
The Mathematics of TitrationDon’t forget, the big M that stands
for molarity is the same thing as moles/Liter!
Practice Problem #1A 25mL solution of H2SO4 is
neutralized by 18mL of 1.1M NaOH. What is the molarity of the H2SO4?
Practice Problem #2A 19.0mL solution of H3PO4 is
neutralized by 22.7mL of 2.3M Ca(OH)2. What is the molarity of the H3PO4?
Practice Problem #3How much 1.3M HCl is needed to
neutralize 39.6mL of 2.1M NaOH?
Practice Problem #4How much 2.9M NaOH would be
needed to neutralize 42.7mL of 3.1M H2SO4?