Strength of Acids and Bases|Neutralisation in Daily Life

Strength Of Acid And Base Solutions|The pH Scale|Universal Indicator With Examples

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Bromophenol blue is an acid having dissociation constant 5.48xx10^(-5) . The percentage of coloured ion furnished at a ph of 4.84 is :

The strengths of acids and bases are directly related to their strengths as electrolytes. The electrical conductivity of 0.1 MCHl :

33.Heat of neutralisation of weak acid with strong base is "-50kJ" and weak acid, weak base is "-41.4kJ" .Then A) heat of ionisation of weak acid "7.4kJ/mole B) heat of strong acid and strong base neutralisation is- "57.4kJ C) heat of ionisation of weak base is "16kJ/mole D) heat of ionisation of weak base is "8.6kJ/mole

For strong acid strong base neutralisation energy for 1 mole H_(2)O formation is -57.1 kJ .If 0.25 mole of strong monoprotic acid is reacted with 0.5 mole of strong base then enthalpy of neutralisation is

Relative Strength Of Weak Acid And Bases

The pH of a solution of weak base at neutralisation with strong acid is 8. K_(b) for the base is

Strength Of Acids|Bases|PYQ|Chemical properties Of Bases|Chemical properties Of Acids|VIP|OMR