How can you determine the hardness of the mineral?

Answer 1

use it to scratch other solid materials

Answer 2

Some professional type test kits include a calcium hardness test. Not too many test kits available for average home pool owner, so best to take water sample to a Pool store to have it tested. Try looking on the internet for 'calcium hardness test kits' and see if you can find one at not too much cost.

Answer 3

Many water chemistry kits and test strips can test for calcium levels. The recommended calcium level for a pool is 200-400 ppm. The calcium level increases rather slowly in the pool water. Rather than buy a kit or strips, you could just take a sample of water to a pool company such as Leslie's and have them test it or you. There is no charge. Water sample should be from a depth of approximately 18", and should be less than one hour old when it is tested.

Answer 4

1) Add a few drops of dilute sodium hydroxide solution to the solution you wish to test for calcium ions

2) A white precipitate will form

3) Divide the solution containing the precipitate in two equal volumes

4) Take one of the divided solutions & add double its volume of sodium hydroxide

5) Take the other divided solution & add double its volume of ammonium hydroxide solution

6) If the white precipitate dissolves in neither of the solutions (neither the sodium hydroxide or the ammonium hydroxide solution) then calcium ions are present.

- Extra note -

Also, if the white precipitate does dissolve in both the sodium hydroxide solution & the ammonium hydroxide solution, this means zinc ions are present. If the white precipitate dissolves only sodium hydroxide solution, this means aluminium ions are present.

Answer 5

You can test them by getting two minerals and rubbing them together to see which one loses more of it's contents

Answer 6

You rub the minerals. The mineral that gets scratched is weaker.

Answer 7

use moh's hardness scale