A student investigated the effects of different sugar concentrations on the rate of respiration in yeast cells.
The student was given a stock solution of 0.50 mol dm-3 glucose and asked to prepare 50.0 cm3 of each of several dilutions.
Complete the table below to show how the student should prepare the solutions. All values must be written to one decimal place.
| Final concentration of solution (mol dm−3\text{mol dm}^{-3}mol dm−3) | Volume of 0.50 mol dm-3 glucose stock solution (cm3\text{cm}^3cm3) | Volume of distilled water (cm3\text{cm}^3cm3) | Final volume (cm3\text{cm}^3cm3) |
|---|---|---|---|
| 0.50 | 50.0 | ||
| 0.40 | 50.0 | ||
| 0.30 | 50.0 | ||
| 0.20 | 50.0 | ||
| 0.10 | 50.0 | ||
| 0.00 | 50.0 |
The glucose stock solution was prepared by measuring the mass of solid glucose on an electronic balance using a weighing bottle:
The balance recorded masses to two decimal places with an uncertainty of ±0.01 g\pm 0.01\text{ g}±0.01 g for each reading.
Calculate the percentage uncertainty in the mass of glucose. Show your working and round your final answer to two decimal places.
