Surfactants

Question 1

Define HLB

Answer 1

hydrophilic, lipophilic Balance of surfactant

Question 2

Value range of HLB?

Answer 2

1-20

Question 3

Low HLB emulsifier soluble in?

Answer 3

Oil

Question 4

Surfactant with Positively charged hydrophilic polar group is called?

Answer 4

Cationic

Question 5

Surfactant with Non-charged hydrophilic polar group?

Answer 5

Nonionic

Question 6

hydrophilic polar group charge of Zwitterionic

Answer 6

Positive and Negative

Question 7

Define CPP

Answer 7

Critical Packing Parameter

Question 8

Define CMC

Answer 8

Critical Miscele Concentration, the conc. at which micelles form between water and air.

Question 9

What are two types of Dispersing agents

Answer 9

surfactants, Polymeric

Question 10

Define Dispersing agent

Answer 10

Migrates Solid and liquid interfaces and causes stability

Question 11

High HLB emulsifier soluble in?

Answer 11

Water

Question 12

Very Low HLB emulsifier used as?

Answer 12

Anti-foaming agent

Question 13

Very High HLB emulsifier used as?

Answer 13

Detergent or Solubiliser

Question 14

What type of emulsion has hydrophobic head facing in and hydrophilic tail facing out?

Answer 14

O/W

Question 15

What type of emulsion has hydrophobic head facing out and hydrophilic tail facing in?

Answer 15

W/O

Question 16

HLB= E + P/5 for what types of Surfactant?

Answer 16

Alcohol Ethoxylates

Question 17

Equation for HLB of Polyhydroxy Fatty acid esters

Answer 17

HLB = 20 ( 1 - S/A)

Question 18

How to calculate HBL for complex ionic Surfactants?

Answer 18

HLB = 7 + (sum of hydrophilic groups - sum of Lipophilic groups)

Question 19

HLD stands for?

Answer 19

Hydrophilic, lipophilic difference

Question 20

equation for HLD?

Answer 20

HLD = Cc - K(EACN) - a(T-25) + F(s)

Question 21

HLD = 0

Answer 21

Balanced

Question 22

HLD > 0

Answer 22

w/o

Question 23

HLD < 0

Answer 23

o/w