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Questions and Answers
In the context of the experiment, why is it important to remove impurities and excess oxalate ions?
In the context of the experiment, why is it important to remove impurities and excess oxalate ions?
- To maintain the purity of the reactants
- To ensure accurate measurement of calcium ion concentration
- To prevent interference with the precipitation reaction (correct)
- To avoid contamination of the solution
Why does an Erlenmeyer flask heat more quickly than a beaker?
Why does an Erlenmeyer flask heat more quickly than a beaker?
- Because it is made of a better-conducting material
- As it has a higher thermal capacity than a beaker
- Because it is designed to withstand higher temperatures
- Due to its greater surface area exposed to heat (correct)
What does the appearance of brown color instead of pink indicate in the experiment?
What does the appearance of brown color instead of pink indicate in the experiment?
- Presence of excess oxalate ions
- Deficiency in H2SO4 volume or too low temperature (correct)
- Formation of a new precipitate
- Inadequate mixing of the solutions
What are the limits of application of Beer Lambert law based on the text?
What are the limits of application of Beer Lambert law based on the text?
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What is the normality of 490mg/L K2Cr2O7 after reduction from Cr+6 to Cr+3?
What is the normality of 490mg/L K2Cr2O7 after reduction from Cr+6 to Cr+3?
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Study Notes
Volumetric Analytical Techniques
- Redox is a type of volumetric analytical technique where electrons are transferred from a reducing agent (e.g. oxalic acid) to an oxidizing agent (e.g. potassium permanganate).
Laboratory Equipment
- Centrifuge: a device used to separate two or more substances (liquid and solid) that do not react chemically, resulting in two distinct layers: supernatant (upper layer) and precipitate (lower layer).
Measuring Concentration
- Photometer: a device used to measure the concentration of a solution by measuring its absorbance of light at a specific wavelength.
Absorbance and Wavelength
- Absorbable curve: a graph that illustrates the relationship between the absorbance of a colored solution and its wavelength at a constant concentration.
Practical Considerations
- Temperature control: water bath temperature should not boil, as this can cause the reduction of KMnO4 before the start of the reaction with H2C2O4.
Redox Reactions
- Oxidation and reduction occur concurrently, with the number of electrons lost in oxidation equal to the number of electrons gained in reduction.
Standard Solution Preparation
- NaOH cannot be prepared as a standard solution because it is a hygroscopic compound that absorbs CO2 and H2O from the atmosphere.
Precipitate Treatment
- Precipitates are washed with NH4OH to remove impurities.
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