Acid Base and Salt Introduction

State on what basis are acids, bases and salts classified as strong or weak electrolytes .

In a buffer solution consisting of a mixture of weak base and its salt, the ratio of salt to base is increases 10 times , the pOH of the solution will

Match Column -I with Column -II : Column -I Column-II (A) Ph of water ( p ) ( 1)/( 2) p K_(w) ( B ) Ph of a salt of strong acid and strong base ( q) pH = (1)/(2) [ pK_(w) + pK_(a) + log c ] (C ) Ph of a salt of weak acid and strong base ( r ) pH = ( 1)/( 2) [ pK _(w) + pK_(a) - pK_(b)] (D) Ph of a salt of weak acid and weak base (s) 7 where K_(a) , K_(b) are dissociation constants of weak acid and weak base and K_(w) = Ionic product of water.

A particular solution contains molecules and ions of the solute. Therefore, it is a: (a) weak acid (b) strong acid (c) strong base (d) salt solution

Solution of a weak acid and its anion (that is,its conjugate base) or of a base and its common cation are buffered. When we add a small amount of acid or base to any one of the, the pH of solution change very little. pH of buffer solution can be computed as for acidic buffer : pH=pK_(a)+ log.(["Conjugate base"])/(["Acid"]) for basic buffer : pOH=pK_(b)+log.(["Conjugate acid"])/([Base]) It is generly accepted that a has useful buffer cpacity (pH change resisting power) provided that the value of [salt or conjugate base] /[acid] for acidic buffer lies within the range of 1 : 10 to 1. Buffer capacity is maximum when [conjugate base] = [acid] Useful correct statement :

In a mixture of weak acid and its salt, the ratio of concentration of salt to acid is increased ten fold. The pH of the solution

Assertion : The aqueous solution of CuSO_4 is acidic in nature. Reason : Copper sulphate is a salt of a weak base and a strong acid.

Assertion: The pH of a buffer solution does not change appreciably on additions of a small amount of an acid or a base. Reason: A buffer solution consists of either a weak acid and its salt with a strong base or a weak base its salt with a strong acid.

Which of the following solutions containing weak acid and salt of its conjugate base has maximum buffer capaity?

Give the name of an acid salt found in "Health Salts".