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GCSE Chemistry 11L1 > Water > Flashcards

Flashcards in Water Deck (12)
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1

Which main ions make hard water?

Calcium and Magnesium

2

When calcium and magnesium ions react with soap what is made?

Scum

3

What is considered very hard water?

Above 200mg/l as calcium carbonate equivalent

4

How can you measure hardness of water?

Titration with soap solution

5

How can temporary hard water be softened?

Boiling

6

Can permanent hard water be softened?

No it stays hard even after boiling

7

What are 3 benefits of drinking hard water?

- can improve taste
- good for development of bones and teeth
- can reduce heart disease

8

What are two methods for softening water?

- adding sodium carbonate to the water
- using ion exchange column

9

Does soft water or hard water form a permanent lather easily when mixed with soap?

Soft water

10

What is temporary hard water caused by?

Dissolved calcium hydrogencarbonate

11



Which type of water needs a lot of soap to form a permanent lather

Hard

12

Which group calcium in

Group 2