20 mL of standard hard water having 2200 mg/L of CaCO3 when titrated against EDTA solution which gave an end point at 19 mL. The same EDTA was used to titrate 29 mL sample hard water
which gave an end point at 25 mL. 100 mL of the same hard water sample was boiled, cooled
and filtered and made up with distilled water to 100 mL. 23 mL of this water sample consumed
15 mL of the same EDTA. Calculate the temporary, permanent and total hardness of the water
sample.

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.