Acid-base and heat The heat of neutralization is heat produced when 1 mole of water is produced by the reaction of the acid and base

1. SHREE MALLIKARJUN COLLEGE CLASS:FYBSC
SAFETY: Refer to the MSDS of of hydrochloric acid and sodium hydroxide.
-Dr. Mithil S. FalDesai
Aim: Determination of enthalpy of neutralization of hydrochloric acid with sodium hydroxide.
Chemicals: HCl, NaOH
Apparatus/Instrument: Beaker, measuring cylinder, thermometer, calorimeter
Theory: The heat of neutralization is heat produced when 1 mole of water is produced by the
reaction of the acid and base. One mole of HCl reacts with one mole of NaOH to give one mole
of water.
HCl + NaOH  NaCl + H2O + heat
Above reaction is done in a calorimeter whose heat capacity (Ccal) is previously determined or
known. The heat change during the neutralization is measured using a thermometer. Change in
temperature after mixing acid and base is given by
Δt = T2-T1 --------------eq 1
Thus, heat gained by the calorimeter is equal to the heat of neutralization (qneutralization).
qneutralization = Ccal XΔt --------------eq 2
The enthalpy of neutralization (ΔH) is given by
ΔH = (qneutralization)/ Number of moles of water formed --------------eq 3
The unit of enthalpy is J mol-1.
Procedure:
1) Take 50 ml of 2.0 M HCl and 50 mL of 2.0 M NaOH in two beakers; wait for 30 min so that a
solution attains the room temperature.
2) Measure the temperature of both the solutions (T1).
3) Pour 50 ml of 2.0 M HCl in the calorimeter.
4) Add quickly 50 ml of 2.0 M NaOH and stir.
5) Note down the maximum temperature of the resultant solution attained after the mixing (T2).
Result: The enthalpy of neutralization of hydrochloric acid with sodium hydroxide =___ J mol-1.
Questions
1) What is enthalpy?
2) What is heat capacity of calorimeter?
3) Compare the enthalpy of neutralization of acetic acid and hydrochloric acid.
4) What is a calorimeter and colorimeter?
5) Why usually water is used for calorimetric measurments?

2. SHREE MALLIKARJUN COLLEGE CLASS:FYBSC
SAFETY: Refer to the MSDS of of hydrochloric acid and sodium hydroxide.
-Dr. Mithil S. FalDesai