1. Experimant (7):The effect of temperature on the reaction rate Theory
The specific rate constant is related to the temperature by the expression Or in the integrated forms:

2. Arrhenius Equation

3. In this experiment the hydrogen ion catalyzed hydrolysis of methyl acetate ester has been selected.

4. Object: To study the effect of temperature on the rate constant Procedure:
1-Pipet 100 mL of the 1 M HCl into a stoppered flask and place it in the water bath maintained at 25ºC.
2-Place at the same time-the flask of methyl acetate in the water bath.
3-Allow both flasks to come to thermal equilibration, this will take about 15 min.
4-Pipet 5 mL of the ester in a small bottle and directly record its weight, and then pour it to the acid. Record the time of mixing.
5-Remove 5 mL samples of the reaction mixture according to the time schedule given below. Drain them into Erlenmeyer flask containing 75 mL of ice and water.
6-Accomplish the titration of these mixtures against the standard NaOH solution.

5. Table (1): Table (2): T, C Wt. of 5 mL Ester Moles of ester Time, min
Time, min
V NaOH
Moles NaOH
Moles AA formed
Moles NaOH – moles HCl
[Ester] M
- Ln [Ester]

6. Useful data: MW of Methyl acetate =
[Ester]final = moles AA (formed) – moles HCl