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Percentage Yield equals open paren the fraction with numerator Actual Mass obtained and denominator Theoretical Mass end-fraction close paren cross 100 % 6. Conclusion
is a cornerstone practical that teaches the powerful technique of Job’s method. By carefully preparing solutions of varying mole fractions, measuring absorbance, and plotting a Job’s plot, you can deduce the stoichiometry of a metal-ligand complex – in this case, a 1:1 Fe³⁺-salicylate complex.
| Experiment | [KIO₃] (M) | Volume KIO₃ (mL) | Volume H₂O (mL) | Time (s) | 1/Time (rate) | |------------|------------|------------------|----------------|----------|----------------|
of concentrated ammonia to the solution while stirring until any initial precipitate completely redissolves to form a deep blue solution. Precipitate the product : Slowly add
Plot Mean Absorbance (y-axis) vs. Mole fraction of Fe³⁺ (x-axis). You will obtain a parabola-like curve. Draw two best-fit straight lines through the ascending and descending limbs. Their intersection gives the mole fraction at maximum complex formation.
Need help with your lab report or data analysis? Leave a comment below (for forum reprints) or consult your STPM chemistry teacher.
This is the primary screening test for the carbonyl functional group ($C=O$).
The core of the experiment is mastering the —specifically condensation reactions with derivatives and oxidation reactions.
To determine the , order of reaction , and rate constant for a reaction between, for example:
: Ethanol is often added to reduce the solubility of the complex, causing it to precipitate out of the solution.
: For theoretical questions related to this topic in the 2013/14 exam cycle, you can refer to the STPM Chemistry 2013/14 Marking Scheme . Chemistry STPM Experiment 10 Technique | PDF - Scribd
: The crude aspirin is purified through recrystallization using a suitable solvent (usually a mixture of ethanol and water).
Percentage Yield equals open paren the fraction with numerator Actual Mass obtained and denominator Theoretical Mass end-fraction close paren cross 100 % 6. Conclusion
is a cornerstone practical that teaches the powerful technique of Job’s method. By carefully preparing solutions of varying mole fractions, measuring absorbance, and plotting a Job’s plot, you can deduce the stoichiometry of a metal-ligand complex – in this case, a 1:1 Fe³⁺-salicylate complex.
| Experiment | [KIO₃] (M) | Volume KIO₃ (mL) | Volume H₂O (mL) | Time (s) | 1/Time (rate) | |------------|------------|------------------|----------------|----------|----------------|
of concentrated ammonia to the solution while stirring until any initial precipitate completely redissolves to form a deep blue solution. Precipitate the product : Slowly add
Plot Mean Absorbance (y-axis) vs. Mole fraction of Fe³⁺ (x-axis). You will obtain a parabola-like curve. Draw two best-fit straight lines through the ascending and descending limbs. Their intersection gives the mole fraction at maximum complex formation.
Need help with your lab report or data analysis? Leave a comment below (for forum reprints) or consult your STPM chemistry teacher.
This is the primary screening test for the carbonyl functional group ($C=O$).
The core of the experiment is mastering the —specifically condensation reactions with derivatives and oxidation reactions.
To determine the , order of reaction , and rate constant for a reaction between, for example:
: Ethanol is often added to reduce the solubility of the complex, causing it to precipitate out of the solution.
: For theoretical questions related to this topic in the 2013/14 exam cycle, you can refer to the STPM Chemistry 2013/14 Marking Scheme . Chemistry STPM Experiment 10 Technique | PDF - Scribd
: The crude aspirin is purified through recrystallization using a suitable solvent (usually a mixture of ethanol and water).
