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Preparation and Properties of a Soap

Preparation and Properties of a Soap. What is Soap?. Soap is the sodium or potassium salt of a long-chain fatty acid. Sodium Stearate. How does soap work?.

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Preparation and Properties of a Soap

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  1. Preparation and Properties of a Soap

  2. What is Soap? Soap is the sodium or potassium salt of a long-chain fatty acid. Sodium Stearate

  3. How does soap work? Because “like dissolves like” the nonpolar end of the soap molecule can dissolve the greasy dirt, and the polar or ionic end of the molecule is attracted to water molecules.

  4. Emulsion An emulsifying agent is a substance used to disperse one liquid in the form of finely suspended particles or droplets in another liquid. This is what soap is… Sketch courtesy of: http://www.chromatography.amershambiosciences.com/

  5. How is soap formed? When we treat fats or oils with strong bases such as lye (NaOH) or potash (KOH) they undergo hydrolysis and form glycerol and soap.

  6. Properties of soap… Because soaps are salts of strong bases and weak acids, they should be weakly basic. However, sometimes soap can be basic enough to cause skin damage so an alkalinity test must be performed on our soap after we make it today.

  7. More properties of soap… Soap becomes ineffective in hard water. Hard water contains large amounts of Ca2+ and Mg2+ salts. Because of this, synthetic detergents have become common alternatives for soap.

  8. And some more properties… In acidic solution, soap is converted to free fatty acid and therefore loses its cleansing action.

  9. Today we will… • Use vegetable oil to make soap. • Use alcohol as a solvent and NaOH to hydrolyze the fatty acid into our soap compound. • Filter our soap.

  10. We will also… Test the properties of soap… • Emulsifying properties: we will mix oil and water and see how the addition of our soap effects the mixture’s ability to form an emulsion. • Hard water reactions: we will test our soap with minerals associated with hard water to demonstrate their effects on our soap. • Alkalinity - we will test the basicity of our soap.

  11. Caution! Alcohol is flammable! Do not allow near an open flame or heat source. Do not take your soap home for personal use!!

  12. Potential Health Concerns • Inhalation: irritant, coughing, shortness of breath, drowsiness, loss of appetite, aspiration pneumonia, chemical pneumonitis, pulmonary edema, coma • Ingestion: irritation of the mucous membranes, mouth, throat and digestive tract, gastrointestinal upset, vomiting, abdominal pain, vomiting, diarrhea, central nervous system depression, hypocalcemia, lack of reflexis, headache, gastritis, intoxication, blindness, low blood pressure, tachycardia, skin discoloration, rigidity, convulsion, dehydration, organ congestion, perforation, shock, coma, death • Skin contact: irritant, burns, cracking, flaking, defatting of skin, absorption through the skin, dermatitis, ulcers, rash, cyanosis • Eye contact: mechanical abrasion of the eyes, tearing, burns, pain, blurred vision, conjunctivitis, corneal damage • Tumorigen, mutagen, teratogen and reproductive effector

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