The enthalpies of neutralization of a strong acid HA and weak acid HB by NaOH are -13.7 and − 12.7 kcal / eq respectively. When one equivalent of NaOH is added to a mixture containing 1 equivalent of

Question

The enthalpies of neutralization of a strong acid HA and weak acid HB by NaOH are -13.7 and − 12.7 kcal / eq respectively. When one equivalent of NaOH is added to a mixture containing 1 equivalent of HA and HB , the enthalpy change was -13.5 kcal . In what ratio is the base distributed between HA and HB ?

TestHub · Accepted Answer

Let x be the fraction of NaOH reacting with HA. x ( − 13.7 ) + ( 1 − x ) ( − 12.7 ) = − 13.5 − 13.7 x − 12.7 + 12.7 x = − 13.5 − x = − 0.8 x = 0.8 Ratio HA:HB = 0.8 : 0.2 = 4 : 1 .

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