Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter14: Acid- Base Equilibria
Section: Chapter Questions
Problem 118CP: Malonic acid (HO2CCH2CO2H) is a diprotic acid. In the titration of malonic acid w ith NaOH,...
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Transcribed Image Text:14ibavioi aondade das lo 2slon 00t.0 (eq a) E
eowno.nontet bns cad
Chem 20 Spring 2021bion
1.
Name
Critical Thinking Questions
olisliT esall-blnd
Nodium hydroide.
1. Why is it important to rinse the buret with NaOH before filling it?
to avon hamng amonts of Hao lef in buret. This isto
prement Inacuracy.
Tobuloe HOen iabrsie lo vinaloM
2. You add water to the flask as you are titrating. How does this affect
the moles of acetic acid present in the solution?
1t doesnt affect it.anibion toud segoiv latfini
baett noganiv to sirtulov
3. You keep adding NaOH in the titration until your pink color is very
dark and bright. Would this cause the calculated molarity of acetic
acid to be too high, too low, or unaffected? Why?
e.
foo Wigh, welwe. excelsed titrati aldingtomuch Nall
5o mords obseicd of NaOt! nad iBe, higher Kaling to
a higher obsemes moranty.
i.
4. If you forgot to fill the tip of the NaOH buret, took your initial reading
and then completed the titration, what measurement would be
affected? Would this error cause the calculated molarity of acetic
acid to be too high, too low, or unaffected? Why?
Lomer, more Na0H than eecconted forso molanty of
aatic cuid wold beloner sthathe actray.
5. What weight of NaOH was needed to prepare 2.00L of the solution
that you used in your titrations?
s li sge of 1olordeni diw dood) gariv ni gOcHsOH lo v\w .A
(.aoiteluolso air) ni bsau ed Je Totosl noidulib
154
Transcribed Image Text:Chem 2 n Snrlns 20
Name
anolt Report Sheet lnol
Acid-Base Titration
Data Table
1. Molarity of ståndard NaOH solution
Vinegar
0.100M
#1
#2
#3
rOY S
final vinegar bret reading
initial vinegar-buret reading
volume of vinegar used
500mL
.00 mL
5.00ML
final NaOH buret reading
40.22mL
40.6/mL 43.3mL
initial NaOH buret reading
bt3.13mL
40:12mL 40.23rml 40:amc
Mol BWAC Calculations (Carry out to the proper number of significant digits.)
volume of NaOH used
Molanty
Lof sol
1. Molarity of(HC2H3O2 in each titration.
0.100 mol xo.04012€.1
gaibson le#1
ua olob mol1000540 wol ool dgil oo) od of bioe.
'x 0.0402Lxi
O.005U
= 0.804 im > 0.804M
2. Average molarity of HC2H3O2 in vinegar.
0.802t o.805
+ 0.804
0.80366
3. Grams of HC2H3O2 per liter of vinegar. w HOSM to idaiow tedv004
0.864 ma xed
40.2 gL
4. w/v% of HC2H3O2 in vinegar. (Check with instructor to see if a
dilution factor must be used in this calculation.)
48.2
4.02%
(00mL
153
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