Water Flashcards
Which main ions make hard water?
Calcium and Magnesium
When calcium and magnesium ions react with soap what is made?
Scum
What is considered very hard water?
Above 200mg/l as calcium carbonate equivalent
How can you measure hardness of water?
Titration with soap solution
How can temporary hard water be softened?
Boiling
Can permanent hard water be softened?
No it stays hard even after boiling
What are 3 benefits of drinking hard water?
- can improve taste
- good for development of bones and teeth
- can reduce heart disease
What are two methods for softening water?
- adding sodium carbonate to the water
- using ion exchange column
Does soft water or hard water form a permanent lather easily when mixed with soap?
Soft water
What is temporary hard water caused by?
Dissolved calcium hydrogencarbonate
Which type of water needs a lot of soap to form a permanent lather
Hard
Which group calcium in
Group 2
