When 1 g-equivalent of strong acid reacts with strong base, heat released is 13.5 kcal. When 1 g-equivalent H 2 A is completely neutralized against strong base, 13 kcal is released. When 1 g-equivalen

Question

When 1 g-equivalent of strong acid reacts with strong base, heat released is 13.5 kcal. When 1 g-equivalent H 2 A is completely neutralized against strong base, 13 kcal is released. When 1 g-equivalent B(OH) 2 is completely neutralized against strong acid, 10 kcal heat is released. What is the enthalpy change when 1 mole of H 2 A is completely neutralized by B(OH) 2 ?

TestHub · Accepted Answer

The enthalpy of ionization for H ₂ A is calculated as: -13 - (-13.5) = +0.5 kcal/eq For B(OH) ₂ , the enthalpy of ionization is: -10 - (-13.5) = +3.5 kcal/eq The neutralization of H ₂ A by B(OH) ₂ per equivalent is: -13.5 + 0.5 + 3.5 = -9.5 kcal/eq Since one mole of H ₂ A contains 2 equivalents, the total enthalpy change (Δ H) is: Δ H = 2 × (-9.5) = -19 kcal This corresponds to option (d).

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