Name: ______

Date: ______

D2 / investigate and analyse energy changes in physical and chemical processes and solve related problems

Lab: Molar Enthalpy of Neutralization

Purpose: To design a procedure to determine the molar enthalpy of neutralization of sodium hydroxide with sulfuric acid using a Styrofoam calorimeter.

Introduction:

The energy change for the neutralization of aqueous sodium hydroxide with aqueous sulfuric acid will be measured using calorimetric techniques. The molar enthalpy of neutralization, ∆Hneut, will be calculated and compared with the theoretical value.

Balanced Chemical Equation:

______

Materials:

·  Styrofoam calorimeter

·  Thermometer

·  2 X 50 mL graduated cylinders

·  50 mL of 1.00 M NaOH(aq)

·  30 mL of 1.00 M H2SO4(aq)

Procedure: Design a procedure to determine ∆Hneut for the reaction above. Include a labeled diagram of the apparatus (calorimeter).

Observations: Create a table to record your observations.

Analysis:

1. Calculate ∆Hneut, in kj/mol, for the reaction above.

Hints:

·  What formula will you use?

·  How will you determine the initial temperature of the solution?

·  Which reactant is limiting? Show your work! Which reactant will you use for your calculations?

2. Represent the enthalpy change using the 4 different methods.

3. The theoretical value for this ∆Hneut is -56 kj/mol, calculate the percent error. Discuss the most likely sources of error.

Conclusion: Statement that reflects on the purpose of the lab. Was the objective achieved?