Chemistry
Grade-7
Easy
Question
What type of cation is present in hard water?
- Ca+2
- Na+
- Mg+2
- Both a and c
Hint:
Hard water has a lot of minerals.
The correct answer is: Both a and c
- Ca+2 and Mg+2 are present in hard water.
- Water hardness is determined by the concentration of polyvalent cations in the water. Polyvalent cations are positively charged metal complexes with charges greater than 1+.
- Cations usually have a 2+ charge. Common cations in hard water are Ca2+ and Mg2+. These ions enter the water supply by leaching from minerals aquifer.
- Calcite and gypsum are common calcium-containing minerals.
- A common magnesium mineral is dolomite. Rainwater and distilled water are soft water because they have few ions.
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