Name: ______
Date: ______
D2 / investigate and analyse energy changes in physical and chemical processes and solve related problemsLab: 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?