Chemistry - Water Flashcards
(7 cards)
1
Q
What to metal ions cause hardness in water?
A
Magnesium and Calcium
2
Q
What is left behind on water appliances in hard water areas?
A
Limescale
3
Q
What benefits are there for drinking hard water?
A
- contains minerals for our diet
- Helps to maintain strong and healthy teeth
4
Q
Suggest a method for removing the permanent hardness from water and explain how it works
A
Adding sodium carbonate (Na2CO3) - swaps out Na for Ca and Mg, forming a precipitate (an insoluble solid) in the water of CaCO3 which is then filtered
5
Q
What happens if a saturated solution of copper sulfate was cooled?
A
crystals of copper sulfate would appear + solubility decreases
6
Q
A
7
Q
A
