Chemistry project
3BChiu Wing Yan 24 Kwan Chi Ting 25 Lau Yan Ting 26Wong Wun Ching 33
自己做 100%無添加洗顏&沐浴&洗髮精
Introduction WHAT kind of liquid soap is suitable for
us ?
WHY it is GOOD for us ?
HOW to make a liquid soap ?
WHAT kind of liquid soap is suitable for us ? different materials ~herb ~fruits / vegetables -> use to instead water
skin ~dry / normal / oily skin
WHY it is GOOD for us ?
easy to make ~ high success rate
convenient to use ~ environmental and safety
avoid chemicals (emulsifier 乳化劑 ,thickener 增稠劑 )
~no skin sensibility
HOW to make a liquid soap ?
know what kind of skin and needs you are
choose the materials ~ no unsaponifiable (未皂化的 ) matter
follow the steps of experiment
FormulaeOil + Potassium hydroxide chemical reaction
=liquid soap
use level of Potassium hydroxide
use level of water
use level of Potassium hydroxide = oil weight × saponification value
~saponification value = the need of alkalis grams of each gram
of oil
use level of water ~the water of dissolving Potassium
hydroxide = use level of Potassium hydroxide x 3
~the water of dissolving the soap = oil weight x 1~2
Exampleoil weight=Cocoanut oil + Olive oil80g + 370g＝ 450g
use level of Potassium hydroxide ＝ Cocoanut oil × Saponification value of Cocoanut oil + Olive oil × Saponification value of Olive oil
＝ 80g × 0.2660 + 370g × 0.1876＝ 21.28+69.412＝ 90.692
Experiment put the oil into kettle heat the oil to 80℃ pour the water into Potassium hydroxide
(alkaline solution is produced) use the thermometer to stir the solutioncheck the temperaturepour the alkaline solution into
the kettle
stir ~after 10 mins appear small white bobbles ~after 25 mins appear some smoke ~after 45 mins become creamy ~after 60 mins become thick and close to solid
put in a Styrofoam box ~24 hours
put the soap at a dry place ~two weeks
tear the solid soap into small pieces add hot water stir FINISH
Affects the experiment of chemistry is so
professional ~ we can’t do it ourselves
the knowledge of chemistry is related to our daily life
~ Potassium hydroxide soap
Comment increase the knowledge and interests of
chemistry ~ including many formulae
easily to understand ~ complicated idea picture + simple
words ~clear steps
readers can have high sense of participation
~including many suggestion tips
Q: How can I reduce the time of stirring the liquid soap?
A: Add some cold water/increase the heat water!
improve the skin and hair ~most suitable for your skin
~THE END~
