pH of Samples

1. Take six test tubes, wash them with distilled water and place them on the test tube stand. 

2. Mark these test tubes as A, B, C, D, E and F. 

3. Take 2 mL of each of the given chemicals and add them to the test tubes marked as: 
   Test tube A – add 2 mL of dil. HCl acid
   Test tube B – add 2 mL of dil. NaOH solution
   Test tube C – add 2 mL of dil. ethanoic acid
   Test tube D – add 2 mL of lemon juice
   Test tube E – add 2 mL of distilled water
   Test tube F – add 2 mL of dil. sodium bicarbonate solution 

4. Take a white tile and place small strips of pH paper on it, mark them as A, B, C, D, E, and F. 

5. Take clean droppers rinsed with distilled water. 

6. Use each dropper to suck the contents present in the test tubes A to F and pour a drop of each content on marked pH paper respectively.
   E.g., the contents of test tube A to be placed on the pH paper with label A.

7. Observe the colour change in the pH paper and match it with the colour pH chart given. Record your observations. 

(Only two precautions are to be written and I have chosen these)

1. The test sample solutions should be freshly prepared and the fruit juice samples should also be fresh. 

2. Use clean test tubes and mark them carefully.