Activity 2.10 NCERT Class 10 Science, Acids, Bases and Salts

Activity 2.10 NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts

Procedure:

Activity 2.10 asks us to add a few drops of concentrated sulphuric acid slowly into a beaker containing water and see if heat produces.

Observation:

When we touch the bottom of the beaker, it feels hot

Explanation: 

Diluting an acid or base into water is an exothermic reaction. Here hydrogen ion interacts with a water molecule and forms hydronium ion. In this process, heat evolves which make the beaker hot.

H2SO4 ——> H+ + HSO4

H+ + H2O ——> H3O+

Warning:
  • We add acid to water. If we add water to acid, the high concentration of acid may produce a violent exothermic reaction.
  • Concentrated acids and bases are corrosive; no person should touch it with bare hand or skin. In case a few drops¬†spill on the body, a person should wash it with plenty of water.

Next: PH of common substances, Activity2.11.

See also: Concentrated acids do not turn litmus paper into red, activity 2.9.

 

Ref: Hydronium ion.

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