CAIE A-Level Biology AS 2.1.5 Semi Quantitative Benedicts Test Questions

Estimate reducing sugar concentration from Benedict's colour changes, calibration evidence and controlled test procedures.

Exam points

Use a semi-quantitative Benedict's test to estimate reducing sugar concentration from colour change and calibration evidence.

[Maximum number: 1]

The table shows some steps that can be made in carrying out the Benedict's test.
Which combination of steps is required to carry out a semi-quantitative test on a reducing sugar solution?

standardise volume of Benedict's solution and volume of test solution

boil with hydrochloric acid and then neutralise with alkali

standardise boiling time with Benedict's solution and compare final colour with numbered colour standards

key

✓ = step made

$\boldsymbol{\chi}=$ step not made

✓

$\chi$

✓

$\chi$

✓

$\chi$

✓

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CAIE A-Level Biology AS 2.1.5 Semi Quantitative Benedicts Test Questions question 1