Question EXM.1B.SL.TZ0.b
| Date | May Example question | Marks available | [Maximum mark: 2] | Reference code | EXM.1B.SL.TZ0.b |
| Level | SL | Paper | 1B | Time zone | TZ0 |
| Command term | Determine | Question number | b | Adapted from | N/A |
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]
Interpolation: 9.8 μg cm−3 ✔
using equation: 0.600/0.06283 = 9.55 «μg cm−3» ✔