11. Complete Activity 2.11 (Page 26).
- Test the pH values of solutions given in Table 2.2.
- Record your observations.
- What is the nature of each substance on the basis of your observations?
Answer:
Aim: To test the pH values of the solutions given in Table 2.2and identify the nature of each substance based on the results.
Materials Required: Substances given in Table 2.2, pH paper.
Procedure:
(i) Test each of the substances given in Table 2.2 with pH paper and record your observations in Table 2.2.
(ii) Indicate if the substances are acidic, basic or neutral.
Observations:
Table 2.2:
| S. No | Solution | Colour of pH paper | Approximate pH value | Nature of substance |
| 1 | Saliva (before meal) | Light green | 7.4 | Slightly basic |
| 2 | Saliva (after meal) | Pale yellow | 5.8 | Acidic |
| 3 | Lemon juice | Reddish | 2.5 | Strongly acidic |
| 4 | Colourless aerated drink | Lime green | 6 | Slightly acidic |
| 5 | Carrot juice | Lime green | 6 | Slightly acidic |
| 6 | Coffee | Yellow | 5 | Acidic |
| 7 | Tomato juice | Light orange | 4.1 | Acidic |
| 8 | Tap water | Green | 7 | Neutral |
| 9 | 1 M NaOH | Dark purple | 14 | Strongly basic |
| 10 | 1 M HCl | Deep red | 1 | Strongly acidic |
“11. Complete Activity 2.11 (Page 26).
What is the nature of each substance on the basis of your observations?
Test the pH values of solutions given in Table 2.2.
Record your observations.” – Solved.
Related Links:
Solution to Group Activity
Solution to Activity 2.1
Solution to Activity 2.2
Solution to Activity 2.3
Solution to Activity 2.4
Solution to Activity 2.5
Solution to Activity 2.6
Solution to Activity 2.7
Solution to Activity 2.8
Solution to Activity 2.9
Solution to Activity 2.10
Solution to Activity 2.11
Solution to Activity 2.12
Solution to Activity 2.13
Solution to Activity 2.14
Solution to Activity 2.15
