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Question 12

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 14.5 mm14.5\text{ mm}14.5 mm.
  • The final level is recorded as 39.5 mm39.5\text{ mm}39.5 mm.
  • The ruler used to measure the distance is accurate to the nearest 0.5 mm0.5\text{ mm}0.5 mm (giving an uncertainty of ±0.5 mm\pm0.5\text{ mm}±0.5 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.

[3]
Markscheme

Analysis Questions

  1. A Level
  2. /Biology
  3. /Analysis

45 exam-style questions on OCR A A Level Biology Analysis. Each one has a worked solution and a mark scheme showing where the marks go.

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