Q3 of 13 Page 106

How many types salts can be formed by phosphoric acid? Why?

Three types of salt.

We can see that phosphoric acid dissociates to give three types of anions which can combine with any metal cation to form a salt. So, three anions can result into only three types of salts.


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2

Haven’t you identified the pH value of the soil in relation with different crops? Identify the pH value of soil samples collected from different places.

Identify the crop that is suitable for the soil of each area on the basis of its pH value.

 3

Complete the chemical equations for the ionisation of phosphoric acid.

H3PO4→ H+ + H2PO4–


(Dihydrogen phosphate ion)


H2PO4–→ H+ + .....................


(Hydrogen phosphate ion)


......... → H+ + PO43–


(Phosphate ion)

 3

Write the chemical name of the following salts.

Mg(H2PO4)2


MgHPO4


Mg3(PO4)2

 4

Solutions of sodium carbonate, potassium chloride and ammonium sulphate are taken in separate beakers.


Dip litmus paper (red, blue) in each beaker


i. Observe the colour change of litmus paper and tabulate.



ii. Name the acids and alkalies that react with each other to form each of the salts given above?


iii. Can you explain the colour change of the litmus paper on the basis of the nature of the acid and alkali that react with each other to form the salt?


(Hint: potassium chloride is a salt formed by the reaction between strong acid and strong alkali)