comparison of the effectiveness of the cleansing action of soap and detergen
SOAP CANNOT BE USED IN HARD WATER . but why ? ? haa . jOm terjah . because :
- Hard water is the water that contains MINERAL SALTS , of which the majority of it are CALCIUM and MAGNESIUM SALTS .
- The MAGNESIUM and CALCIUM ions will react with the soap anions to form a NON-SOLUBLE PRECIPITATE in water . This called a SOAP FILM or SCUM .
- Soap CANNOT procuce bubbles in hard water and this condition results in the WASTAGE of soap .
- SCUM not easily cleaned . It will leave a clear SEDIMENT that can be seen on clothes , and cause the clothes to feel hard . In addition , SCUM will stick to the inner parts of the SINK and WASHING MACHINE .
hah ! but DETERGENT CAN BE USED IN HARD WATER . this because :
- DETERGENT does not form SCUM in hard water . This because the ionic head region ( hydrophilic end ) of the detergent will not form a strong ionic bond with the MAGNESIUM and CALCIUM ion from the hard water .
- CALCIUM and MAGNESIUM salt detergent DISSOCIATE EASILY in water .
- Detergent forms bubble in BOTH soft and hard water . This make the detergent MORE EFFECTIVE in its cleansing action compared to soap .
< SCUM at shOwer >
< SCUM at sink >
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