Soap Action and PH
Soap Action and PH
Soap Action and PH
ChemistryProject
RAJKIYA PRATIBHA VIKAS VIDYALAYA, LAJPAT NAGAR, NEW DELHI-110024 Class: XII-A
TABLE OF CONTENTS
Certificate Acknowledgement Preface Introduction Commercial preparation Introduction to experiment Objective and theory Procedure Observation table Result Test for hardness Bibliography
CERTIFICATE
This is to certify that Kaushik Mitra of class XII-A has completed this project titled Foaming Capacity of Soaps under my guidance & this project may be considered as the part of the practical exam of AISSCE conducted by CBSE.
ACKNOWLEDGEMENT
I will treasure the knowledge imparted to me by Mrs. Amita Puri, my grateful thanks to her for the able teaching and guidance. I thank Mr. Harsha Kumar, the Lab assistant for his cooperation. I also thank my parents and my friends for their constant support and cooperation.
PREFACE
Soaps and detergents remove dirt and grease from skin and clothes. But all soaps are not equally effective in their cleansing action. Soaps are the Na and K salts of higher fatty acids such as Palmitic acid, Stearic acid and Oleic acid. The cleansing action of soaps depends on the solubility of the long alkyl chain in grease and that of the -COONa or the -COOK part in water. Whenever soap is applied on a dirty wet cloth, the non polar alkyl group dissolves in grease while the polar -COONa part dissolves in water. In this manner, an emulsion is formed between grease and water which appears as foam. The washing ability of soap depends on foaming capacity, as well as the water used in cleaning. The salts of Ca and Mg disrupt the formation of micelle formation. The presence of such salts makes the water hard and the water is called hard water. These salts thus make the soap inefficient in its cleaning action. Sodium Carbonate when added to hard water reacts with Ca and Mg and precipitates them out. Therefore sodium carbonate is used in the treatment of hard water. This project aims at finding the foaming capacity of various soaps and the action of Ca and Mg salts on their foaming capacity.
INTRODUCTION
Soap is an anionic surfactant used in conjunction with water for washing and cleaning, which historically comes either in solid bars or in the form of a viscous liquid. Soap consists of sodium or potassium salts of fatty acids and is obtained by reacting common oils or fats with a strong alkaline in a process known as saponification. The fats are hydrolyzed by the base, yielding alkali salts of fatty acids (crude soap) and glycerol. The general formula of soap is Fatty end CH3-(CH2) n water soluble end COO-Na+
Soaps are useful for cleaning because soap molecules have both a hydrophilic end, which dissolves in water, as well as a hydrophobic end, which is able to dissolve non polar grease molecules. Applied to a soiled surface, soapy water effectively holds particles in colloidal suspension so it can be rinsed off with clean water. The hydrophobic portion (made up of a long hydrocarbon chain) dissolves dirt and oils, while the ionic end dissolves in water. The resultant forms a round structure called micelle. Therefore, it allows water to remove normallyinsoluble matter by emulsification.
Fat in Soap:
Soap is derived from either vegetable or animal fats. Sodium Tallowate, a common ingredient in much soap, is derived from rendered beef fat. Soap can also be made of vegetable oils, such as palm oil, and the product is typically softer. An array of saponifiable oils and fats are used in the process such as olive, coconut, palm, cocoa butter to provide different qualities. For example, olive oil provides mildness in soap; coconut oil provides lots of lather; while coconut and palm oils provide hardness. Sometimes castor oil can also be used as an ebullient. Smaller amounts of unsaponifable oils and fats that do not yield soap are sometimes added for further benefits.
PREPARATION OF SOAP
In cold-process and hot-process soap making, heat may be required for saponification. Cold-process soap making takes place at a sufficient temperature to ensure the liquefaction of the fat being used. Unlike cold-processed soap, hot-processed soap can be used right away because the alkali and fat saponify more quickly at the higher temperatures used in hot-process soap making. Hot-process soap making was used when the purity of alkali was unreliable. Cold-process soap making requires exact measurements of alkali and fat amounts and computing their ratio, using saponification charts to ensure that the finished product is mild and skin-friendly.
Hot Process:
In the hot-process method, alkali and fat are boiled together at 80100 C until saponification occurs, which the soap maker can determine by taste or by eye. After saponification has occurred, the soap is sometimes precipitated from the solution by adding salt, and the excess liquid drained off. The hot, soft soap is then spooned into a mold.
Cold Process:
A cold-process soap maker first looks up the saponification value of the fats being used on a saponification chart, which is then used to calculate the appropriate amount of alkali. Excess unreacted alkali in the soap will result in a very high pH and can burn or irritate skin. Not enough alkali and the soap are greasy. The alkali is dissolved in water. Then oils are heated, or melted if they are solid at room temperature. Once both substances have cooled to approximately 100-110F (37-43C), and are no more than 10F (~5.5C) apart, they may be combined. This alkali-fat mixture is stirred until trace. There are varying levels of trace. After much stirring, the mixture turns to the consistency of a thin pudding. Trace corresponds roughly to viscosity. Essential and fragrance oils are added at light trace.
PROCEDURE
Take five 100ml conical flasks and number them 1, 2, 3, 4, 5. Put 16ml of water in each flask and add 8 gms of soap. Warm the contents to get a solution. Take five test tubes; add 1ml of soap solution to 3ml of water. Repeat the process for each soap solution in different test tubes. Close the mouth of the test tube and shake vigorously for a minute. Do the same for all test tubes and with equal force. Start the timer immediately and notice the rate of disappearance of 2mm of froth.
OBSERVATIONS
The following outcomes were noticed at the end of the experiment.
Test Tube no. and name of soap 1. 2. 3. 4. 5. Dove Lux Tetmosol Santoor Cinthol
Time taken for disappearance of 2mm froth 1142 328 510 1532 940
RESULT
The cleansing capacity of the soaps taken is in the order:
The tests show negative results for the presence of the salts causing hardness in water. The water used does not contain salts of Ca2+ and Mg2+. The tap water provided is soft and thus, the experimental results and values hold good for distilled water and tap water.
BIBLIOGRAPHY
Parts of this project have been referred from foreign sources and have been included in this investigatory project after editing.
Books:
APC Lab Manual NCERT Text Book
Internet Sources:
www.wikipedia.org www.google.com www.yahoo.com