Scaling mechanism
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Why does water not tend to form scale under acidic conditions but does so easily under alkaline conditions? The higher the pH, the more likely scale formation is. Please explain this to me in detail, focusing on the reaction mechanisms
In conventional solutions, scaling is generally caused by calcium and magnesium deposits; under acidic and alkaline conditions, calcium and magnesium exist in different forms. This, in turn, leads to scaling under alkaline conditions. The higher the pH value, the faster scaling occurs
Specifically? Why is it different? Lack of knowledge and learning
Under acidic and alkaline conditions, calcium and magnesium exist in different forms; precipitates are more likely to form under alkaline conditions.
Is it due to the different forms in which carbonate exists, or is it calcium and magnesium?
Scaling is usually caused by calcium ions and alkalis, so scaling is severe
This post was last edited by qugd on 2016-12-12 09:22. Essentially, scaling is the phenomenon in which negatively charged acid radicals combine with positively charged cations (mostly metal ions) to form substances that are insoluble in water. When the pH is low, that is, when the acidity is high, acids do not easily dissociate into negatively charged anion ions, while those cations that cause scaling can exist in a highly soluble ionic form under the influence of hydrated hydrogen ions. When the pH value rises to a certain level, the concentration of hydrogen ions in water decreases; as a result, acids tend to dissociate into negatively charged acid root ions. Moreover, the hydrated hydrogen ions surrounding metal ions are neutralized by hydroxide ions. When the product of the concentrations of acid root ions and metal ions reaches a certain value (this value is known as the ion product), an insoluble precipitate is formed. For detailed information, one can refer to the chapters on precipitation formation in inorganic chemistry or physical chemistry.
Well, I learned it when I was in school; I just can’t remember some of the details now. Thank you
Scaling occurs when, during the heating of a liquid, minerals break down to form calcium carbonate or magnesium carbonate. In acidic conditions, these scales combine with the acid to form soluble substances, and as a result, no scaling remains.
What kind of minerals can break down to form calcium carbonate or magnesium carbonate?