When temporary hard water is boiled, a reaction occurs that removes the chemical responsible for causing the hardness. Write a word equation and a balanced symbol equation for this reaction. Sodium carbonate makes water soft how?
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Answers
Answer:
As you can se boiling the water causes the precipitation of solid calcium carbonate or solid magnesium carbonate. This removes the calcium ions or magnesium ions from the water, and so removes the hardness. Therefore, hardness due to hydrogencarbonates is said to be temporary
we can see the conversion calcium bicarbonate to the calcium carbonate in the presence of calcium hydroxide. So, we can say that Clark's method is used for the removal of temporary hardness of water.
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Answer:
the hydrogencarbonates of calcium and magnesium cause 'temporary hardness', because boiling the water removes the hardness, these compounds are decomposed on heating.
Despite the problems with hard water e.g. scum formation, furring-up of kettles etc. there are some healthy aspects to living in a hard water area.
The calcium compounds (calcium ions) are good for teeth and bone growth and maintenance.
Traces of iodine and iron compounds in hard water provide other essential minerals for the body.
People living in hard water areas (e.g. limestone areas) generally have a lower incidence of heart disease, though the reasons are not fully understood.