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| Topic: |
Science
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| Number of pages / Number of words: |
2 / 528 |
Essay's paper body
The commercial detergents also have fillers, foam-reducing agents, and bleach.
One disadvantage of soap is the scum they form in hard water. This happens because of precipitation with with calcium stearate. The calcium forms because calcium salts are less soluble then sodium salts.
Ca2+(HCO3)2(aq) + Na2CO3(aq) ?? Ca(C17H35CO2)2(s)
The scum may be avoided by precipitating the Ca2+ ions from the water before the soap is added...
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Sodium Carbonate Ca(HCO3)2(aq) (washing soda) will accomplish this task.
Ca(HCO3)2(aq) + Na2CO3(aq) ?? CaCO3(s) + 2NaHCO3(aq)
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