The enthalpies of neutralization of a weak acid HA & a weak acid HB by NaOH are -6900 Cal/equivalent & - 2900 Cal /equivalent respectively . When one equivalent of NaOH is added to a solution containi

Question

The enthalpies of neutralization of a weak acid HA & a weak acid HB by NaOH are -6900 Cal/equivalent & - 2900 Cal /equivalent respectively . When one equivalent of NaOH is added to a solution containing one equivalent of HA & one equivalent of HB, the enthalpy change was -3900 Calories. From data, the moles of HB neutralized per mole of HA neutralised is.

TestHub · Accepted Answer

Let HA neutralized = x eq and HB neutralized = y eq. Given: x + y = 1 Heat released: 6900 x + 2900 y = 3900 Putting y = 1 − x : 6900 x + 2900 ( 1 − x ) = 3900 4000 x = 1000 ⇒ x = 0.25 , y = 0.75 H A n e u t r a l i ze d H B n e u t r a l i ze d ​ = 0.25 0.75 ​ = 3

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