3.4 Further Analysis and quantitative chemistry Flashcards Preview

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Flashcards in 3.4 Further Analysis and quantitative chemistry Deck (20)
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1

In the flame test, calcium has what colour?

Yellow-red

2

What is the colour from the flame test of copper?

Green-blue

3

Wha metal gives a lilac flame?

Potassium

4

In the flame test, what is the colour given by sodium?

Orange

5

Do you test for halides

Add a dilute nitric acid then silver nitrate

6

Why do you have to add nitric acid to a halide solution when analysing it

Because all other acids will react with the silver nitrate making a white precipitate

7

Name three halides and what colour precipitates are formed

Chloride Cl- : a white precipitate
Bromide Br- : a cream precipitate
Iodine I- : a yellow precipitate

8

What two substances do you add to a solution to see if it contains sulphate ions

Dilute hydrochloric acid thence barium chloride

9

What will be formed if sulphate ions are present and you have added hydrochloric acid and barium chloride

A white precipitate will form

10

The colour brick red is given from what metal flame test?

Lithium

11

In the flame test, what metal has a pale green flame?

Barium

12

Why do we use a white tile in titrations?

To help see a colour change

13

When do we stop repeating measurements for titrations?

When concordant results are achieved.

14

How do you convert a number from cm^3 to dm^3?

Divide the number by 1000

15

What indicator is often used in titrations?

Phenolphthalein

16

What colour is the pricipitate when testing Cloride ions?

White

17

What do you add to a solution you believe has carbonate ions in to know for sure

A dilute acid for example hydrochloric

18

What will happen when an acid is added to a solution with carbonate ions

It will fizz and co2 will form

19

How can you test if co2 has been formed when adding an acid to a possible carbonate solution

By connecting the test tube to another holding limewater the CO2 will turn the lime water cloudy

20

What are the three negative ions you need to know the tests for for gcse

Carbonates
Halides
Sulphates