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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
What else can I help you with?
How is each step on the pH scale different?
The pH scale is logarithmic; the difference between two units is x10.
What is the difference between stroam and cyclone?
A cyclone is a large scale low pressure system with a closed circulation, and cyclonic rotation. Most storms are small to middle scale systems and do not rotate.
What feature on a map or globe can you find the difference between two places?
You can find the difference in elevation between two places on a map or globe using contour lines or shading. These indicators show the varying heights of land features, helping you understand the differences in terrain between the two locations.
What is the scale for the data on average highs if the lowest temperature is 72 and the highest is 88?
The scale for the data on average highs is 16, as it is the difference between the highest temperature (88) and the lowest temperature (72).
How many degrees are ther in between the freezing point and the boiling point on the Celsius scale?
Water freezes at 0o, and boils at 100o, so the difference is 100o.
What is the difference between bar scale and statement scale?
What is the difference between a bar scale and a statement scale
What are the difference between successive values on a scale?
The difference between the successive values on a scale is an interval.
The difference between one number and the next on the scale?
the difference between ine number and the next on the scale ?
What is the difference between scum and trash?
Trash is household waste. Scum is a waste matter that covers washing areas when using a soap in soft water areas. :)
What is the difference between Australia's hurricane scale and the United states hurricane scale?
the difference is that the australian scale has no category
Difference between returns to scale and constant return to scale?
differentiate between returns to scale and constant return to scale
What is the difference between moutians and hills?
Scale.
What is the difference between a microscopic picture and a macroscopic picture?
This is a big difference of scale; at microscopic scale more details are revealed.
What is the difference between a microscope picture and a macroscopic picture?
This is a big difference of scale; at microscopic scale more details are revealed.
What is the difference between nominal and interval scale?
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What is the difference between the values on the scale of a graph?
the answer is, interval
What is the difference between wg scale and gs scale?
GS=salary. WG=hourly.
