C6: Acids, Bases and Salts Flashcards Preview

Chemistry iGCSE > C6: Acids, Bases and Salts > Flashcards

Flashcards in C6: Acids, Bases and Salts Deck (14):
1

Alkali ions

OH-

2

Acid ions

H+

3

pH of pure water

pH 7

4

Salt

A compound formed when some or all of the hydrogen in an acid is replaced by a metal.

5

Acid + Metal ->

Salt + Hydrogen

6

Acid + Base ->

Salt + Water
(Neutralisation reaction)

7

Acid + Alkali ->

Salt + Water
(Neutralisation reaction)

8

Precipitate

An insoluble solid formed by a reaction taking place in a solution.

9

How are precipitation reactions used?

To remove pollutants from the waste water produced by factories.
To remove metal ions from industrial waste water.
Remove unwanted ions from drinking water.

10

Acid + Metal Carbonate ->

Salt + Water + CO2

11

Test for CO2

Limewater solution.

12

How to carry out a Titration

1. Measure a known volume of alkali into a flask using a volumetric pipette. Measure from the bottom of the Meniscus.
2. Add a few drops of indicator (phenolphthalein- Pink in alkali, colourless in acid)
3. Pour acid into a Burette. Drop into alkali until alkali changes colour.
4. Measure how much acid it took, an repeat until you get two identical results.

13

Where does the alkali go in a Titration?

The flask.

14

sums to remember

conc = mol/ vol and mol = mass/ Mr