2. What is the mass of KHP that you will weigh? a. The instructions read "Weigh out accurately 700 to 800 mg of KHP". Why are you given a range in the instructions and why is this acceptable? + is acceptable because KH P is the excess reactant and therefore, you only need to hayo enough moles of this compound but a spečific nunber or mole's.
2. What is the mass of KHP that you will weigh? a. The instructions read "Weigh out accurately 700 to 800 mg of KHP". Why are you given a range in the instructions and why is this acceptable? + is acceptable because KH P is the excess reactant and therefore, you only need to hayo enough moles of this compound but a spečific nunber or mole's.
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.2QAP
Related questions
Question
Just answer number 2
Transcribed Image Text:Prelab:
Before coming to lab: Make an outline of procedures in your lab notebook as described in the
Laboratory Notebook Requirements at the beginning of the manual.
Prepare a table like that shown in the Experimental Procedures section of the experiment to
record your titration data. Use a straight edge.
Instructor use only
Complete this prelab assignment (questions 1-8) on these sheets in the spaces provided. Tear
out at the beginning of the lab period and stack on your instructor's bench along with your
notebook.
1.
Define the following terms:
a point where the stoichiometry of the
equation is satistied. This means that
eyoush moles of tritrant hgve becn
ndded to the analyte, in order to
completely reaot and satisfu the
solution according to the indicator.
a. Equivalence point
titration where the tritiation
çonplete. there is in
b. End point – +he poinnt in a
is complete. One particularity
end point is thnt
color of the solution accordingto'the
indicator.
cte is a
change
c. Molarity - A COnceyrtration ynit that relates the moles
if solute and the volume of solution in
of.
liters, according to the followins
moley
Molarity-Volune
equation
d. Units for molarity –the units
of molaritu are moles/Liters
45
Transcribed Image Text:of titrant that can be writHen accordint he butet,
2.
What is the mass of KHP that you will weigh?
a. The instructions read "Weigh out accurately 700 to 800 mg of KHP". Why are
you given a range in the instructions and why is this acceptable?
t is acceptable because KH P is the excess
reactant and therefore, you only need to
haye enough, moles of this compound but
OV
not a spečific number or mole's.
Why is it important to not have any bubbles in the tip of the buret?
H is jmgortautnot to have huy bubbles inthe tie.
of the buret becawe, of herwise the yolvne of titrant
3.
nuy
actually added will be differevrt from the yolume
itant that can be written accoraing Tuet
to the
butet. If there are bubbles in the tip
the volume of titraut that, actva ly cts in contact
with the analyte, will be lower than the recorded
volume.
4. How many milliliters of 6.0 M NaOH must be used to prepare 1.0 L of 0.10 M NAOH?
Show calculation with units.
Given:
MiVi =
M2 V2
Vi = MaV- 0.10(mol)xIL
VI=
Mi
M = 0.10M
V2 = 1L
V = 0-01aelale L
Viにle.07 mL
5. A student titrates a 25.00 mL aliquot of HCl (concentration unknown) with 33.10 mL of
0.1500 M NaOH. What is the concentration of HCl? Show calculation with units.
MIVI Ma V2
M2V20.1500(ml)x 33.10x102
MI=
VI
HCl+ Na DH -> He0+NaCl
Given:
25x10-5L
Mi =0.1906M
V = 25 mL
Ma= 0.1500M
Vz=3,3.10ML=33.10x/DL
Concentrstion
of Hei=D0.1904M
46
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