Lab 14 Handin done
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Lab 14 Hand-in
Name: olivia Landry
Purpose:
To standardize a sodium hydroxide solution and determine the molarity of an acetic acid
solution.
Data:
Table 1: Standardization of NaOH
Molarity of HCl :
0.9535 M
Final HCl buret reading (mL)
20.50 mL
Final NaOH buret reading (mL)
27.80 mL
Initial HCl buret reading (mL)
0.50 mL
Initial NaOH buret reading (mL)
0.70 mL
Table 2: Titration of unknown HC
2
H
3
O
2
Final HC
2
H
3
O
2
buret reading (mL)
20.30 mL
Final NaOH buret reading (mL)
24.80 mL
Initial HC
2
H
3
O
2
buret reading (mL)
0.30 mL
Initial NaOH buret reading (mL)
0.40 mL
Calculations:
Part 1: Standardization of NaOH
HCl
(aq)
+
NaOH
(aq)
NaCl
(aq)
+
H
2
O
(l)
Its balanced
1. Calculate volume of HCl.
Convert to L
Final HCl buret reading (mL) – Initial HCl buret reading (mL) = mL HCl
20.50 mL - 0.50 mL = 20mL
Volume HCl mL x
1
L
=
L HCl
1000 mL
20 mL * 1/1000ml =
0.02L HCI
2. Calculate volume NaOH used in titration (Table 1).
Convert to L
Final NaOH buret reading – initial NaOH buret reading =
mL NaOH
27.80 mL - 0.70 mL= 27.1mL NaOH
Volume NaOH mL
x
1
L
=
L NaOH
1000 mL
27.1mL NaOH*1/1000=0.0271L NaOH
3. Calculate the molarity of NaOH (mol NaOH/L NaOH) Record answer in Table 3.
L HCl
x
mole HCl
x
mole NaOH
x
1
=
mol NaOH
(M NaOH)
L HCl
mole HCl
L NaOH
L NaOH
0.02L HCI * 0.9535 M / 0.02L HCI .* 39.99mol NaOH /
36.46 mol
HCI * 1 / 0.0271L NaOH = 38.59
M NaOH
Part 2:
Titration of unknown HC
2
H
3
O
2
NaOH
(aq)
+ HC
2
H
3
O
2
(aq)
NaC
2
H
3
O
2
(aq)
+
HOH
(l)
4. Calculate volume of HC
2
H
3
O
2
used in titration.
Convert to L.
Final buret reading HC
2
H
3
O
2
– initial buret reading HC
2
H
3
O
2
= mL HC
2
H
3
O
2
20.30 mL - 0.30 mL = 20 mL HC2H3O2
Volume HC
2
H
3
O
2
in mL
x
1 L
=
L
HC
2
H
3
O
2
1000 mL
20 mL HC2H3O2 * 1 /1000 = 0.02L
5. Calculate volume of NaOH used in titration (Table 2).
Convert to L.
Final buret reading NaOH – initial buret reading NaOH = mL NaOH
24.80 mL - 0.40 mL= 24.40mL
NaOH
Volume NaOH in mL
x
1
L
=
L
NaOH
1000 mL
24.40mL NaOH * 1 / 1000 = 0.0244L
6. Calculate molarity of HC
2
H
3
O
2
(mol HC
2
H
3
O
2
/L HC
2
H
3
O
2
).
Report answer in Table 3.
L NaOH
x
mol NaOH
x
mol
HC
2
H
3
O
2
x
____1_____
=
mol HC
2
H
3
O
2
/L HC
2
H
3
O
2
(M HC
2
H
3
O
2
)
from
#1
from
#2
Coefficients
from balanced
equation
Molarity
HCl in
Table 1
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