Shweta Thakur posted an Question
November 06, 2020 • 23:36 pm 30 points
  • Chemistry (CY)

Is it always true that on addition of acid or base the ph of buffer has no effect...?? hanges and ence the p

acid adde d to form NaOH or ions concentratio Jase or the Se or the acid added Dack the Dack the OH s or H0* ions. Thus, the H0+ Jn chang Changes and ence the pH of the solution changes. Buffer Action of Acidic Buffer. For example, let us consider the buffer action of the acidic butter containing CH,COOH and CH COONa. Acetic acid dissociates to a small extent whereas sodium acetate 1s almost completely dissociated in the aqueous solution as follows: CH,COOH + H,0 CH,COO+ H,0* CH,COONa CH,CO0+ +Nat (i) .(ii) By 'common ion effect', the ionization of CH,COOH is further suppressed. Thus, in the solution, there are excess of acetate (CH,CO0) ions and a small amount of H0* ions. When a few drops of an acid are added to the above mixture solution, the H30* ions given by the acid combine with the CH COO ions to form weakly ionized molecules of CH COOH. CH,COO + H,0 CHCOOH+ H,O Thus, the H0t ion concentration and hence the pH of the solution remains almost constant. Similarly, when a few drops of a base are added, the OH ions given by the base combine with the H3O ions already present to form weakly ionized molecules of H,O. H0 OH 2H,0 + [From ()] [Given by the base] As the H,0* ions are consumed, the equilibrium () shifts towards right (according to Le Chatelier's principle). Thus, more of CH,COOH dissociates to make up the loss of H,0 ions. Hence, the H,0t ion COncentration or the pH of the solution does not change. Buffer Action of Basic Buffer. The buffer action of a basiç huffer exnlainad 11

2 Answer(s) Answer Now
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    Dinesh khalmaniya 1 best-answer

    yes shweta. Buffer Solution is a water solvent based solution which consists of a mixture containing a weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base. They resist a change in pH upon dilution or upon the addition of small amounts of acid/alkali to them. The pH of Buffer Solutions shows minimal change upon the addition of a very small quantity of strong acid or strong base. They are therefore used to keep the pH at a constant value.

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    ok sir

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    Priyanshu kumar Best Answer

    The pH of the solution does not rise significantly. It almost remain constant. Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base.  The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-,  to neutralize H+ ions.


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