it becomes soft
A previously boiled egg (unshelled) would simply be heated up and become a very hard boiled egg.
NoBoiling makes temporary hard water become soft water. Temporary hard water contains the compound calcium hydrogencarbonate. When temporary hard water is heated it breaks down to form insoluble calcium carbonate. This is the white scale, or fur you see on the inside of kettles. Using heat to break down a substance is called thermal decomposition.All the calcium hydrogencarbonate has been removed from the water, so it is now soft water. A word equation for the thermal decomposition of temporary hard water is:calcium hydrogencarbonate = calcium carbonate + carbon dioxide + water
I like my eggs hard boiled. The water boiled in the pot.
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.
salt
boiled water
Temporary hard water contains bicarbonates of calcium and magnesium. We can convert it to soft water by boiling or by adding calculated quantity of calcium hydroxide.
Lime scale will eventually coat the inside of the kettle. Unless this layer of lime scale is regularly removed, the efficiency of the kettle to boil water fast is impaired.
calcium hydrogencarbonate.
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.
Lime scale will eventually coat the inside of the kettle. Unless this layer of lime scale is regularly removed, the efficiency of the kettle to boil water fast is impaired.
Apparently you would date it??