properties of water

[daniel6]

1/what type of water can be produced when it falls on limestone? i think its hard water im not sure


2/what happens when hard water is heated?

 

[ecowarm]

Water described as “hard” is high in dissolved minerals, specifically calcium and magnesium. Hard water is not a health risk, but a nuisance because of mineral buildup on fixtures and poor soap and/or detergent performance.
Water is a good solvent and picks up impurities easily. Pure water — tasteless, colorless, and odorless — is often called the universal solvent. When water is combined with carbon dioxide to form very weak carbonic acid, an even better solvent results.
As water moves through soil and rock, it dissolves very small amounts of minerals and holds them in solution. Calcium and magnesium dissolved in water are the two most common minerals that make water “hard.” The degree of hardness becomes greater as the calcium and magnesium content increases.
Limestone and chalk are two areas where minerals are picked up.


When water is heated the minerals are released as limescale deposits.

 

[verdigrey]

Thanks Ecowarm , its great to see it explained .

 

[fuzzy]

1 - hard or temporary hard
2 - hard water - nothing, temporary hard leaves limescale deposits

 

[Reg Man]

1 - hard or temporary hard
2 - hard water - nothing, temporary hard leaves limescale deposits

Daniel6 I take it your on first year NVQ course. Take note of Fuzzy's answer, thats what their looking for on the answer sheet. If you have your study book its in the cold water section.