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The amount of paracetamol in a sample needs to be determined - HSC - SSCE Chemistry - Question 9 - 2021 - Paper 1
Question 9
The amount of paracetamol in a sample needs to be determined. The UV absorption spectrum of paracetamol is shown. Based on the absorption spectra provided, which s... show full transcript
Worked Solution & Example Answer:The amount of paracetamol in a sample needs to be determined - HSC - SSCE Chemistry - Question 9 - 2021 - Paper 1
Step 1
Based on the absorption spectra provided, which solvent should be used to determine the amount of paracetamol?
Answer
To determine the amount of paracetamol using UV absorption, it is essential to select a solvent that does not absorb significantly at the wavelength where paracetamol exhibits maximum absorbance. From the UV absorption spectrum provided for paracetamol, we can see that it has a prominent peak near 250 nm.
After analyzing the absorption spectra of the four solvents:
- Solvent A shows significant absorbance around 250 nm, which would interfere with measurements.
- Solvent B also has measurable absorbance that could affect readings.
- Solvent C shows minimal absorbance around this wavelength.
- Solvent D has a significantly lower absorbance at and around 250 nm.
Therefore, the most suitable option to accurately measure paracetamol without interference is Solvent D.