Why H+ ion acts as a Lewis acid?

 

  1. No.6.Why H+ ion acts as a Lewis acid?

Answer. H+ has an electron accepting tendency therefore, it acts as Lewis acid. Such as

H++NH3 ——> NH4+

  1. No.7. Name two acids used in the manufacture of fertilizers.

Answer. Two acids used in manufacture of fertilizers are sulphuric

acid and nitric acid

  1. No.8.Define pH. What is the pH of pure water?

Answer. Negative logarithm of hydrogen ion concentration [H+] is called

pH = -log [H+]

The pH of pure water is 7.

Q.No.9.How many times a solution of pH I will be stronger than that of a solution having pH 2?

Answer. A solution of pH 1 has H+ concentration 0.1 M while that of pH 2 has H+ concentration 0.01 M. 0.1 M concentration is 10 times greater than that of 0.01 M. As strength of an acid depends upon the concentration of H+ ions therefore, a solution of pH 1 is 10 times stronger than that of a solution of pH 2.

 

  1. No.10. Define the followings:
  2. Normal salt ii. Basic salt

Answer.

Normal salt: A salt formed by the total replacement of ionizable H+ ions of an acid by a positive metal ion or NH4+ ion is called normal or neutral salt.

HCl(aq) + KOH(aq)          KCl(aq) + H2O(1)

Basic salt: A basic salt is formed by the incomplete neutralization of a polyhydroxy base by an acid.

Al (OH) 3(aq) + HCl(aq)    ————— >  Al(OH)2Cl(aq) + H2O(1)

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