Real Lab Procedure
Determination of pH using pH Paper
- Take a pH paper strip and place it on a white tile.
- Pour a drop of the sample on the pH paper using a clean dropper.
- Observe the colour of the pH paper.
- Now compare the colour obtained on the pH paper with the different colour shades of the standard colour pH chart and note down the pH value.
- Similarly, find the pH of the remaining samples using a fresh strip of pH paper and a separate dropper for each sample.
Determination of pH using Universal Indicator Solution
- Take a small quantity of the given sample in a test tube using a dropper.
- Using a dropper pour a few drops of the universal indicator solution into the test tube containing the sample.
- Shake the test tube well and note the colour developed in the test tube.
- Now compare the colour produced in the test tube with the different colour shades of the standard colour pH chart and note down the pH value.
- Similarly, find the pH of the remaining samples.
Simulator Procedure (as performed through the Online Labs)
- You can select the aqueous solution from the 'Select the aqueous solution' drop down list.
- Now choose any one of the sample solutions in the beaker by clicking on it.
- You can find out the pH value of the solution using any of the two methods mentioned below.
Using pH Paper
- Drag the dropper towards the beaker and dip it into the solution to take the solution in it.
- Still holding the dropper, move it from the beaker over to the pH paper and release it to pour a few drops of the solution on to the pH paper .
- The area on the pH paper over which the solution is poured develops a colour.
- To find the pH value of the solution, select the colour strip from the standard colour pH chart and drag it to the pH paper to compare it.
- The colour that matches with the spot on the pH paper indicates the pH value of the solution.
Using Universal Indicator Solution
- Click on the dropper in the universal indicator solution bottle and drag it towards the solution in the beaker to pour the universal indicator into it.
- The solution changes colour.
- To find the pH value of the solution, select the colour strip from the standard colour pH chart and drag it near to the solution in the beaker to compare it.
- The colour that matches with the colour of the solution in the beaker indicates the pH value of the solution.
Record the observations in a tabular column.
||For pH Paper
||For Universal Indicator Solution
|Colour produced on the pH Paper
||Colour produced in the solution
- Use only the standard colour pH chart supplied with the pH paper for assessing the pH value.
- Keep the pH strips away from chemical fumes.
- Either use fresh fine dropper or glass rod for each different sample, or wash the dropper or glass rod well with water every time.
- To correctly view the colour produced on the pH paper, keep the pH paper on a white tile while performing the experiment.