CHEM 123 Practical II: Acid-Base Titrations

CHEM 123 Practical II: Acid-Base Titrations

Student Name: ________________________________ Total Points: _____________

Lab Day/Time ________________________________ TA: ____________________



Max points Student Score
Pre lab 3
Pre procedure 3
In-lab performance 6
Calculations 8
Precision and Accuracy
Part A:
6
Standardization of NaOH
Part B:
12
Determination of [HCl]
Part C:
12
Determination of [H2SO4]
Total points 50

Report the final concentrations below using three sig. figs.

Part A: [NaOH]
AVG [NaOH] _________________
Trial 2 [NaOH] _______________________
Precision ________________
Trial 3 [NaOH] ________________________


Part B: HCl unknown # _________
AVG [HCl] ____________________ Accuracy ________________
Trial 2 [HCl] ________________________
Precision ________________
Trial 3 [HCl] _________________________


Part C: H2SO4 unknown # _________
AVG [H2SO4] ____________________ Accuracy ________________
Trial 2 [H2SO4] ______________________
Precision ________________
Trial 3 [H2SO4] _______________________

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, In tables below, enter the raw data only.
(Volumes with decimal places)



Part A: Standardization of NaOH
(Use MW of KHP = MW 204.223 g/mol)

Trial # 1 2 3
Mass of KHP
Moles KHP
NaOH Vol 1 (mL)
NaOH Vol 2 (mL)
ΔV = Vol2-Vol1 (mL)


Part B: Titration of HCl

Trial # 1 2 3
Vol HCl (mL)
NaOH Vol 1 (mL)
NaOH Vol 2 (mL)
ΔV = Vol2-Vol1 (mL)


Part C: Titration of H2SO4
Trial # 1 2 3
Vol H2SO4 (mL)
NaOH Vol 1 (mL)
NaOH Vol 2 (mL)
ΔV = Vol2-Vol1 (mL)




• The volumes above should represent initial (V1) and final (V2) buret readings of titrant.
(indicated with two decimal places for all trials)
• The average [Concentrations] and Std. Dev. should be based on results from trials 2 and 3 only.
• Calculations should be done using correct SI units (e.g: L, not mL!)
• You will be graded based on accuracy and precision.
• In lab performance is graded based on: the correct buret recording, titration set-up, use of
laboratory techniques, safety and general student preparation (prepared notes, clean bench, etc.)




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