1. Titration of Acids and Bases
Experiment 20
Titration of Acids and Bases
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2. In Lab
Work in groups of 4
2 people for Part A; standardization of the prepared solution of NaOH
2 people for Part B; analysis of an unknown acid
Each student does their own calculations after sharing data
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3. Part A NaOH solution is already prepared, 0.1 M Do not boil any water
Standardize the NaOH solution to find the next significant figure for molarity
0.1? M
(If you use the g balance, then you will have 3 SF for the molarity, 0.1? ? M)
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4. Part B Do not boil any water
There is no weighing bottle; use weighing paper
Use the molarity determined in Part A for calculations in Part B
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5. Parts A and B Buret readings have 2 SF after the decimal point
14.18 mL
Obtain volume by difference for titrant
(final – initial)
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6. YouTube Videos How to Titrate
NAIT Chemical Technology Laboratory Techniques
CarolinaBiologicals
Both are good videos on how to do a titration
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7. Calculations Part A moles NaOH → Molarity NaOH; M = moles / L
g KHP → moles KHP → moles NaOH → M NaOH
g → moles; use molecular weight of KHP
moles KHP → moles NaOH; use coefficients in balanced chemical equation
moles NaOH → Molarity NaOH; M = moles / L
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8. Calculations Part B
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9. Calculations Part B (continued)
mL NaOH → moles NaOH → moles KHP → g KHP → % KHP
mL NaOH → moles NaOH; M x L = moles, use M from Part A
moles NaOH → moles KHP; use coefficients in balanced chemical equation
moles KHP → g KHP; use molecular weight of KHP
g KHP → % KHP
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