Podcast
Questions and Answers
In the reaction between oxalic acid and NaOH, what is the molar ratio of oxalic acid to NaOH?
In the reaction between oxalic acid and NaOH, what is the molar ratio of oxalic acid to NaOH?
- 2:1
- 1:1
- 1:2 (correct)
- 1:4
Phenolphthalein is used as an indicator in the titration of oxalic acid with NaOH.
Phenolphthalein is used as an indicator in the titration of oxalic acid with NaOH.
True (A)
What is the purpose of using a top-loading balance in this experiment?
What is the purpose of using a top-loading balance in this experiment?
To accurately weigh oxalic acid
The endpoint of the titration is indicated by a ______ color change.
The endpoint of the titration is indicated by a ______ color change.
Which of the following apparatus is NOT typically required for determining the molarity of oxalic acid solution volumetrically?
Which of the following apparatus is NOT typically required for determining the molarity of oxalic acid solution volumetrically?
Oxalic acid is a base.
Oxalic acid is a base.
What is the volume of the measuring flask used to prepare the oxalic acid solution?
What is the volume of the measuring flask used to prepare the oxalic acid solution?
The concentration of the standard NaOH solution used in this experiment is ______ M.
The concentration of the standard NaOH solution used in this experiment is ______ M.
Why is it important to wash the beaker with distilled water and transfer the washings to the measuring flask after transferring the oxalic acid solution?
Why is it important to wash the beaker with distilled water and transfer the washings to the measuring flask after transferring the oxalic acid solution?
Match each piece of glassware with its primary function:
Match each piece of glassware with its primary function:
Flashcards
Volumetric Analysis
Volumetric Analysis
To find the concentration of Oxalic acid solution by reacting it with a standard solution of NaOH.
Apparatus Used
Apparatus Used
Pipette, burette, funnel, beaker, measuring flask, watch glass, top loading balance, spatula.
Standard Solution
Standard Solution
A solution with a precisely known concentration
Standard Solution
Standard Solution
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Indicator Definition
Indicator Definition
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Indicator Used
Indicator Used
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End point
End point
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End Point Observed
End Point Observed
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Preparing Oxalic Acid
Preparing Oxalic Acid
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Study Notes
- Practical #4 (Part 1) is about determining the exact molarity of Oxalic acid solution volumetrically
Apparatus
- Uses pipette, burette, funnel, beaker, measuring flask 100 cm³, watch glass, top loading balance, and spatula
Chemicals
- Requires standard solution of NaOH (0.1M), oxalic acid, and phenolphthalein
Chemical equation
- Reaction of oxalic acid with 2NaOH yields sodium oxalate and 4H₂O
- n₁ = 1 mole, where n₁ represents moles of oxalic acid
- n₂ represents moles of sodium oxalate
- (COOH)₂(aq) + 2NaOH(aq) → (COONa)₂ + 2H₂O(l) is an alternative equation without water of crystallization
Molar ratio
- The molar ratio of oxalic acid to NaOH is 1:2
Standard solution
- 0.1M NaOH
Indicator
- Phenolphthalein
End point
- Light pink
Procedure
- Weigh exactly 1.26 g of oxalic acid on a watch glass using a top loading balance
- Dissolve the oxalic acid in about 50 cm³ of distilled water in a beaker
- Transfer the solution to a 100 cm³ measuring flask and wash the beaker with a small amount of water, transferring the washings to the same measuring flask
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