DP Chemistry (first assessment 2025)

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Question EXM.1B.SL.TZ0.2b

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Date May Example question Marks available [Maximum mark: 2] Reference code EXM.1B.SL.TZ0.2b
Level SL Paper 1B Time zone TZ0
Command term Determine Question number b Adapted from N/A
b.
[Maximum mark: 2]
EXM.1B.SL.TZ0.2b
(b)

After 3 days, the broccoli samples were removed from storage and 1.0 g of each sample was blended with 100.0 cm3 of water. The filtered solution was mixed with the reactant in the same proportions as that used for the calibration curve in a cuvette and measured.

The sample stored at 5 °C showed an absorbance of 0.600. Determine the concentration of ascorbic acid in the sample solution by interpolation and using the line equation.


interpolation in graph: ..........................................................................................................................


using line equation: .............................................................................................................................

 

 

[2]

Markscheme

Interpolation: 9.8 μg cm−3 ✔

using equation: 0.600/0.06283 = 9.55 «μg cm−3» ✔

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