Temporary hard water can be softened by boiling the water. This is the end point of total hardness titration. Lime Softening Another process is called lime softening. While some studies suggest a correlation between hard water and lower cardiovascular disease mortality, other studies do not suggest a correlation.
Permanent hardness is hardness mineral content that cannot be removed by boiling. Dishes and glasses may be spotted when dry. Heating causes the bicarbonate ion in temporary hard water to decompose into carbonate ion COcarbon dioxide CO2and water H2O.
Chelsea, MI: Lewis Publishers. You should not detect any hardness in pure water, but it always takes a little soap to get a good lather of soap bubbles. For this reason, water softening is often unnecessary.
Insoluble calcium carbonate in limestone, chalk and insoluble magnesium carbonate both dissolve in acid rainwater to form soluble hydrogencarbonates e. Briefly, explain why the pH of deionized water is typically found to be around 6.