Mr Tyler Mcintosh Essay

618 Words Nov 30th, 2013 3 Pages
This reaction is important in the erosion of carbonate rocks, forming caverns, and leads to hard water in many regions.
An unusual form of calcium carbonate is ikaite with crystal water, CaCO3•6H2O. Ikaite is stable only below 6 °C.
[3]The big problem when descaling with citric or acetic acids are the released flavor additives which cause an obtrusive smell during descaling. The plastic parts of your fully automated coffee maker tend to taken on these smells and influence the smell and taste of your coffee negatively. Plastic parts and sealing gaskets of your unit can be attacked by the vinegar or acetic acid.
Citric acid tends to flake during descaling. This can block the valves and water pipes and lead to high repair charges. An
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Sulphamic acid is used as an acidic cleaning agent, typically for metals and ceramics. It is a replacement for hydrochloric acid for the removal of rust. In households, it is often found as a descaling agent in detergents, cleaners and toilet cleaners for the removal of limescale.
[4]
Citric Acid
Advantages:
Citric acid leaves behind zero toxic residues and has just enough acidic concentration to descale without etching or damaging household surfaces in any way and there are no volatile compounds or products that harm the environment.
Disadvantages:
Because citric acid is a weak acid, it won't remove heavy build-up of scale very quickly. It is also a powder hence it must be dissolved for use. It also works best with hot water meaning there will be higher energy consumption. Even when used with hot water, citric acid is not as effective at descaling as Sulfamic acid.
Sulfamic Acid
Advantages:
Sulfamic acid is the fastest de-scaler - It dissociates into hydroxonium ions more readily in aqueous solution than the others, therefore giving a greater concentration of atoms that are able to react with the calcium in lime scale. It is safe to use because it does not produce chlorine gas [5], which can be toxic. Sulfamic acid also has a low volatility.

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