Answer to Question #130182 in General Chemistry for A

Question

A neutralization of a strong acid by a strong base gave out 4590 J of heat energy.

Determine the enthalpy change (in kJ) for the reaction.

Give your answer to three significant figures.

Answer 1

The enthalpy decreases when a strong acid is neutralized by a strong base.

The exothermic reaction, therefore, releases energy, and the heat-energy potential (enthalpy) falls.

The enthalpy of the neutralization reaction occurring between strong monobasic acids and strong monoacid bases does not depend on their nature, since the same reaction occurs in solutions.

Standard enthalpy of neutralization — the enthalpy of the reaction of strong acids and bases to form 1 mole of water under standard conditions:

HCl + NaOH = NaCl + H2O

H⁺ + OH ^- = H2O, $\Delta H$ -55,9 kJ/mol