Topic 2 Flashcards Preview

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Flashcards in Topic 2 Deck (19):
1

one mole of atoms or molecules of any substance will have

a mass in grams equal to the RFM for that substance

2

moles =

mass/ RFM

3

concentration=

mass/ vol in dm3

4

hard water makes

scum

5

hardness is caused by

Ca and Mg ions

6

hard water contains these ions from

running over rocks

7

water can be softened by removing

calcium and magnesium ions

8

temporary hardness is caused by

calcium hydrogencarbonate

9

permanent hardness is caused by

calcium sulfate

10

temporary hardness is removed by

boiling

11

limescale is

insoluble

12

both types of hardness can be used with

ion exchange resin

13

a resin is

a solid polymer that's insoluble in water

14

used to find out concentrations

titrations

15

an acid-base titration is a

neutralisation reaction

16

titrations allow you to find out exactly how much

acid is needed to neutralise a quantity of alkali

17

used as indicator goes colourless when in neutralised alkali

phenolphthalein

18

concentration=

moles/ volume

19

to make soluble salts using an acid and a soluble reactant

you must first carry out a titration to make it the exact right amount