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Scum is created when calcium ions (and or magnesium ions) form an insoluble precipitate with soap. Soap consists of sodium salts of fatty acids.
e.g. sodium stearate (aq) + calcium ions (aq) = calcium stearate (s) + sodium ions (aq)
Scum is the calcium stearate.
Limescale is created when hard water i heated, or when it evaporates. It is formed because calcium hydrogen carbonate is unstable.
Ca(HCO3)2 (aq) + heat = Cac03 (s) +H20 (l) +CO2 (g)
calcium hydrogen carbonate + heat = calcium carbonate + water + carbon dioxide
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoWhen water converts into steam conc of dissolved salt inc, after reaching a saturation level the salts are thrown out in form of ppts. This is sludge.while scale is a hard and adherent deposit on the surface of boiler.
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