1. Interfacial tension Definition:

2. Determination of interfacial tension: γ water/olive oil = 22.9 dyne / cm γ water/ oliec acid = ? d olive oil = 0.91 d oliec acid = 0.889 γ A/B = v (d 1 - d 2 ) k

3. Determination of Critical Micelle Conc. Of a SAA by Surface tension Method SAA: CMC:

4. Procedure: You will provided with stock solution of SAA (1% SLS) & water with surface tension of 72.8 dyne/cm. The total volume in each test tube is 10 ml.

5. γ 1 /γ 2 = n 2 /n 1 No. of drops ml. Of water ml.0f SAA Conc. Of SAA No. of test tube 0%1 0.005%2 0.01%3 0.05%4 0.2%5 0.3%6 0.5%7