Activity 2.14 Class 10 Science

In this activity, we will examine different salts samples to test their solubility in water, their effect on litmus paper. We can identify whether a salt is acidic, basic or neutral.

Activity 2.14- Testing the Nature of Salt Solutions

Aim of the activity

To investigate nature, solubility, p^H of given salt solutions.

Materials Required

    1. Distilled water

    2. Test tubes

    3. String rod

    4. Salt samples

    5. Blue and red litmus paper

    6 .Universal indicator and p^H strips

Procedure

We take a small quantity of each salt sample in separate test tubes and add 10-15 mL of distilled water into each test tube.

 Now we stir to check solubility.

After we dip red and blue litmus paper into each solution and note the colour change.

Now we check p^H using p^H paper and identify the nature of each salt solution.

Observation

S. No.	Salt	Formula	Solubility in Water	Action on Litmus	Approximate pH	Nature	Acid Used	Base Used
1	Sodium chloride	NaCl	Soluble	No change	~7	Neutral	HCl	NaOH
2	Potassium nitrate	KNO₃	Soluble	No change	~7	Neutral	HNO₃	KOH
3	Aluminium chloride	AlCl₃	Soluble	Blue to red	~5	Acidic	HCl	Al(OH)₃
4	Zinc sulphate	ZnSO₄	Soluble	Blue to red	~5.5	Acidic	H₂SO₄	Zn(OH)₂
5	Copper sulphate	CuSO₄	Soluble	Blue to red	~4.5	Acidic	H₂SO₄	Cu(OH)₂
6	Sodium acetate	CH₃COONa	Soluble	Red to blue	~8	Basic	CH₃COOH	NaOH
7	Sodium carbonate	Na₂CO₃	Soluble	Red to blue	~9–10	Basic	H₂CO₃	NaOH
8	Sodium hydrogen carbonate	NaHCO₃	Soluble	Red to blue (weak)	~8.5	Weakly Basic	H₂CO₃	NaOH

Conclusion

Through this activity, we can conclude that different salts show different behaviour in aqueous solution depending on their parent acid and base. We can also classify salts as acidic, basic or neutral.

Frequently Asked Questions

    1. Why do some salts show acidic nature?

Answer – Because these salts are formed from a strong acid and a weak base.

    2. Why is distilled water used in this activity?

Answer – Distilled water is free from impurities and neutral in nature.

    3. What is the significance of knowing the p^H of salts solutions?

Answer – This is useful in industries, agriculture and pharmaceuticals.

All Activities Acids , Bases and Salts

 

S.No.	Topics
1	Activity 2.1
2	Activity 2.2
3	Activity 2.3
4	Activity 2.4
5	Activity 2.5
6	Activity 2.6
7	Activity 2.7
8	Activity 2.8
9	Activity 2.9
10	Activity 2.10
11	Activity 2.11
12	Activity 2.12
13	Activity 2.13
14	Activity 2.14
15	Activity 2.15