Titration and Buret readings.notebook
April 18, 2017
Titration
Method used to determine the unknown concentration of a solution.
(see eBook/textbook pp. 487­493)
Neutralization Reactions:
(NOT a hydrolysis reaction)
Acid + Base
_______ + _______
i.e. HCl + NaOH
_______ + _______
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Titration and Buret readings.notebook
April 18, 2017
The point at which neutralization is complete:
buret
NaOH
"Equivalence Point"
_______concentration (0.50M)
moles H+1 = moles OH­1
_______ volume...TBD
HCl
________ concentration (M) Indicator used to show
the EQ point.
________volume (50.0mL)
Measuring Volume on a Buret
Top of buret
reads "0.00 mL"
Final volume = _____mL
Initial volume = 0.00mL
Total volume = _____mL
Slightly pink with phenolphthalein @ equiv. pt.
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Titration and Buret readings.notebook
April 18, 2017
Determination of concentration of unknown:
NaOH
HCl
Volume = 39.32mL
Volume = 50.0mL Concentration = 0.50M Concentration = ?
HCl + NaOH
H2O + NaCl
Extra practice reading a buret:
42.30mL
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Titration and Buret readings.notebook
April 18, 2017
More practice reading a buret:
14.59mL
Formative Assessment #2 p. 493
20.0mL of 0.0100M HCl(aq) neutralizes 30.0mL of NaOH(aq). Determine M of NaOH.
HCl + NaOH
0.0100M = H2O + NaCl
?mol H+
0.020L
"Equivalence Point"
= 0.00020mol H+ =
=
0.0300L
0.00667M NaOH
4
Titration and Buret readings.notebook
April 18, 2017
Ca(OH)2 (aq)
CO2 + H2O
Initial
Ca2+ + 2OH-
H2CO3
@ EQ Point
H+ + HCO3-
Just past EQ Pt
5