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Temporary Hardness Temporary hardness is hardness that can be removed by boiling or by the addition of lime (calcium hydroxide). It is caused by a combination of calcium ions and bicarbonate ions in the water. By boiling the water, it promotes the formation of carbonate from the bicarbonate and will precipitate calcium carbonate (the limescale) out of solution, leaving water that is less hard after it has cooled. When it has been heated, less carbon dioxide is able to dissolve into the water. Since there is not enough carbon dioxide around, the reaction cannot take place, and therefore the calcium carbonate will not "dissolve" as readily. Instead, the reaction is forced to re-establish equilibrium, and the solid calcium carbonate is formed. Heating water will remove hardness as long as the limescale that precipitates out is removed. After cooling, if enough time passes the water will pick up carbon dioxide from the air and the reaction will again proceed, allowing the calcium carbonate to "redissolve" in the water. Permanent Hardness Permanent hardness is hardness (mineral content) that cannot be removed by boiling. When this is the case, it is usually caused by the presence of calcium and magnesium sulphates and/or chlorides in the water, which become more soluble as the temperature rises. Despite the name, the hardness of the water can be easily removed using a water softener, or ion exchange column.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoHard water is defined as the presence of divalent cations, Ca2+ and Mg2+. These ions do not affect the health of people who drink the water but does affect the volume of soap powder needed to get a froth.
If the calcium and magnesium is in the form of bicarbonates it is simple to soften the water by boiling it. We see the effects of this if we look inside the kettle. The brown residue is due to calcium and magnesium "scale". This causes a problem in commercial boilers as the scale build up can clog pipes. The water has a temporary hardness that can be removed by boiling.
Permanent hardness occurs when the calcium and magnesium salts are not bicarbonates but have another anion like sulfate. This hardness has to be removed by adding water softener.
Wiki User
∙ 13y agoi dont know the fist question but I know the 2nd one. you boil it so that you can remove the hardness of water
Wiki User
∙ 12y agotemporary hard water is easy to convert to soft water where as permanent hard water is the other way round
Wiki User
∙ 8y agoBecause sometimes during an experiment the independent variable or dependent veariable can soften up,so that is why we call sertain hardness ,temporary hardnesess.
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Wat salt is responsible for temporary and permanent hardness of water?
Temporary hardness of water: CaHCO3, MgHCO3 Permanent hardness of water: CaSO4, MgSO4
What are the two form of hardness found in water?
Hardness in water is usually characterised as temporary or permanent. Both are due to the presence of calcium or magnesium ions. If they are present as the hydrogen carbonate, when the water is boiled this is converted to the carbonate which precipitates out as a solid, leaving water which is no longer hard, so this is called temporary hardness. If they are present as the sulfate the solution is unaffected by boiling, and this is called permanent hardness.
What causes permanent hardness of water?
Presence of bicarbonates of chlorides or sulphates of calcium or magnesium in water are the main causes of hardness of water.
What are the types of hard water?
Hardness in water is usually characterised as temporary or permanent. Both are due to the presence of calcium or magnesium ions. If they are present as the hydrogen carbonate, when the water is boiled this is converted to the carbonate which precipitates out as a solid, leaving water which is no longer hard, so this is called temporary hardness. If they are present as the sulfate the solution is unaffected by boiling, and this is called permanent hardness.
How is potassium palmitate used in the determination of water hardness?
Sodium palmitate produce a permanent lather with hard water..
Wat salt is responsible for temporary and permanent hardness of water?
Temporary hardness of water: CaHCO3, MgHCO3 Permanent hardness of water: CaSO4, MgSO4
What other substance cause by permanent hardness?
Permanent hardness in water is hardness due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium, which will not be precipitated by boiling.
What are the two form of hardness found in water?
Hardness in water is usually characterised as temporary or permanent. Both are due to the presence of calcium or magnesium ions. If they are present as the hydrogen carbonate, when the water is boiled this is converted to the carbonate which precipitates out as a solid, leaving water which is no longer hard, so this is called temporary hardness. If they are present as the sulfate the solution is unaffected by boiling, and this is called permanent hardness.
What causes permanent hardness of water?
Presence of bicarbonates of chlorides or sulphates of calcium or magnesium in water are the main causes of hardness of water.
Why temporary hardness is removed from water by boiling but permanent hardness is not?
Permanent hardness is hardness (mineral content) that cannot be removed by boiling. It is usually caused by the presence in the water of calcium and magnesium sulphates or chlorides which become more soluble as the temperature rises.
What salts can cause hardness of water?
calcium and magnesium
How can you destroy permanent hardness of water due to sulphates of metals?
zeolites
What method remove both temporary and permanent hardness of water?
Boiling method
What is the difference between temp hard water and permanent hard water?
here two type of hardness 1-temporery 2-permanent *temporery hardness-it is also known as carbonate hardness and alkiliny hardness.it is unstable hardness.it is remove by boiling.it is the due presence of carbonate.
What are the types of hard water?
Hardness in water is usually characterised as temporary or permanent. Both are due to the presence of calcium or magnesium ions. If they are present as the hydrogen carbonate, when the water is boiled this is converted to the carbonate which precipitates out as a solid, leaving water which is no longer hard, so this is called temporary hardness. If they are present as the sulfate the solution is unaffected by boiling, and this is called permanent hardness.
How is potassium palmitate used in the determination of water hardness?
Sodium palmitate produce a permanent lather with hard water..
Was the hardness of water increased or decreased by boiling?
1. Only the temporary hardness of water (caused by bicarbonates) is decreased by boiling: bicarbonates were transformed in insoluble carbonates and these compounds become a precipitate. 2. The permanent hardness is not influenced by temperature.
