1. Lab.343

2. Experiment (6)
Alkaline hydrolysis of ethyl acetate (conductance method)

3. Electrical conductivity
A measure of the ability of an aqueous solution to conduct electricity

4. Electrolytic Properties
Electrolyte solution: contains a number of ions.
Strong electrolyte . Ex NaOH
weak electrolyte . Ex CH3COOH
Nonelectrolyte solution: does not contains a ions.
Ex. C2H5OH

5. ethyl acetate hydroxide ion acetate ion ethanol C0 C∞

6. Secand order reaction equation
1/a-x = Kt + 1/a Kt = 1/(a-x ) - 1/a Kt = a- (a-x)/ a(a-x) Kt = x/ a(a-x) Kt = x/ A0(A0-x)

7. Kt = C0 – Ct / A0 (C0 - C∞ - (C0 – Ct ) ) Kt = C0 – Ct / A0 (Ct - C∞ )
Kt = x/ A0(A0-x)
A0 ≡ C0 - C∞
X ≡ C0 – Ct
Kt = C0 – Ct / A0 (C0 - C∞ - (C0 – Ct ) )
Kt = C0 – Ct / A0 (Ct - C∞ )

8. C0 – Ct / Ct - C∞
Slope = K A0 t

9. Prepare: Solid Liquid Volume concentration NaOH CH3COOC2H5 100ml 0.05M
CH3COONa
0.01M

10. Procedure:
1- Measure the conductance of 0.01M NaOH & CH3COONa at room temp. 2-

11. 3- Mix the two solutions , shake thoroughly, place the conductance probe in the mixture and take readings of the conductance

12. C0 – Ct / Ct - C∞ C∞ C0
Ct (μs) t 1 3 5 7 9 11 13 15 17 19 22 25 30 35 40 45