Describe5 marksStandard
A student carries out a semi-quantitative Benedict's test on solutions of known glucose concentration and on an unknown fruit juice sample. She adds Benedict's reagent to each solution, heats them in a boiling water bath, and records the time taken for the first colour change (from blue to green/orange). The results are shown in Table 1.
| Glucose concentration (g dm⁻³) | Time to first colour change (s) |
|---|---|
| 0.5 | 120 |
| 1.0 | 90 |
| 1.5 | 70 |
| 2.0 | 55 |
| 2.5 | 45 |
The fruit juice sample gives a time of 65 s.
Describe how the student could use these data to estimate the concentration of reducing sugar in the fruit juice sample.