Question

What do you call the amount of heat liberated during neutralisation​

Answer 1

Answer:

Explanation:

Neutralisation, or neutralization, is the name given to the reaction that occurs between an Arrhenius acid and an Arrhenius base. ... Molar heat of neutralisation (molar enthalpy of neutralization) is the energy liberated per mole of water formed during a neutralisation reaction.

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Answer 2

Explanation:

Neutralisation, or neutralization, is the name given to the reaction that occurs between an Arrhenius acid and an Arrhenius base.

H+(aq) + OH-(aq) → H2O(l)

When an acid is added to an aqueous solution of base, the temperature of the solution increases.

Or, if a base is added to an aqueous solution of an acid, the temperature of the solution increases.

Energy (heat) is produced when an acid reacts with a base in a neutralisation reaction.

⚛ Neutralisation reactions are exothermic.

⚛ ΔH for a neutralisation reaction is negative.

Molar heat of neutralisation (molar enthalpy of neutralization) is the energy liberated per mole of water formed during a neutralisation reaction.

⚛ ΔHneut is the symbol given to the molar heat of neutralisation.

⚛ ΔHneut is usually given in units of kJ mol-1

Heat of neutralisation can be measured in the school laboratory using a styrofoam cup solution calorimter1:

(i) heat produced = mass of reaction mixture × specific heat capacity of solution × temperature change

(ii) enthalpy change for the reaction = -heat produced

(iii) molar heat of neutralisation = enthalpy change ÷ moles (of water produced)

Molar heat of neutralisation for reactions between dilute aqueous solutions of strong acid and strong base is always the same2, that is,

ΔHneut = -55.90 kJ mol -1

because no bonds need to be broken, and because making the H-O bonds in H2O releases energy

(breaking bonds is an endothermic process, making bonds is an exothermic process)

Less than 55.90 kJ mol-1 of energy is released when:

(a) a weak acid neutralises a strong base

(b) a strong acid neutralises a weak base

(c) a weak acid neutralises a weak base

because some of the energy is consumed in the process of breaking weak acid bonds or weak base bonds.