Question 21 – Practical skills assessed in a written examination - Questions

An experiment is set up to demonstrate osmosis using a simple osmometer. A bag made of selectively permeable visking tubing is filled with a concentrated sucrose solution, tied securely, and connected to a vertical capillary tube. The visking tubing is then immersed in a beaker of pure water.

The level of the solution inside the capillary tube is measured using a ruler:

The initial level is recorded as $mm14.5\text{ mm}$ .
The final level is recorded as $mm39.5\text{ mm}$ .
The ruler used to measure the distance is accurate to the nearest $mm0.5\text{ mm}$ (giving an uncertainty of $mm\pm0.5\text{ mm}$ for each individual reading).

Calculate the percentage uncertainty of the measured change in the solution level. Give your answer to an appropriate number of significant figures.

The level of the solution inside the capillary tube is measured using a ruler:

The initial level is recorded as $mm14.5\text{ mm}$ .
The final level is recorded as $mm39.5\text{ mm}$ .
The ruler used to measure the distance is accurate to the nearest $mm0.5\text{ mm}$ (giving an uncertainty of $mm\pm0.5\text{ mm}$ for each individual reading).

Calculate the percentage uncertainty of the measured change in the solution level. Give your answer to an appropriate number of significant figures.

Practical skills assessed in a written examination

Question 19

Practical skills assessed in a written examination

Question 19

Practical skills assessed in a written examination

Question 19

Practical skills assessed in a written examination Questions

Practical skills assessed in a written examination

Question 19

Practical skills assessed in a written examination Questions