Question

a salt 'x' when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain this phenomenon.

Answer 1

When a salt x is dissolved in water it dissosiates into its ions and then combines with OH- atom from water. This compound is thus a base and turns red litmus blue

Answer 2

The Salt 'X' is Na2CO3

1. Acidic Salts are basic in nature
2. Bases changes red litmus to Blue
3. Thus Sodium hydroxide is the required Salt

This phenomenon is called Test for Base from using the indicator likem litmus

The OH- is responsible for the basic content of the solution

Na2CO3 ------ Na2O + Co2

2NaCl -------- 2Na + Cl2

Many other salts are

• NaCl ( Sodium Chloride )

• CaCo3 ( Calcium Carbonate )

• ZnCo3 ( Zinc Carbonate )
• K2Co3 ( Potassium Carbonate )
• Al2Co3 ( Aluminium Carbonate )
• CuCo3 ( Cupprous Carbonate )