Question

write twi precautions required while finding the ph ?

Answer 1

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.

Answer 2

when you are going to find the ph of strong acids and bases first is your safety so safegaurd your hands,eyes,face,etc and your cloths as strong acids can corrode your cloths.