C8 Acids And Alkalis Flashcards Preview

Edexcel Chemistry 2017 > C8 Acids And Alkalis > Flashcards

Flashcards in C8 Acids And Alkalis Deck (40)
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1

State the pH of a strong acid, strong alkali and neutral solution

1,14,7

2

State three different indicators.

Litmus paper, universal indicator, methyl orange, phenolphthalein.

3

Identify the indicator which turns pink in shampoo.

Shampoo is alkaline, phenolphthalein

4

State the polyatomic ion formed when sulphuric acid dissociates.

SO4 2-

5

The ____________ the pH the higher the concentration of hydrogen ions in solution.

Lower

6

If the concentration of hydrogen ions increases by 1000 fold and the end result was pH 2, what pH did the first solution have?

1000 fold increase = 3 steps on the pH scale... pH5

7

True or false there are no ions present in pH7 pure water.

False thee are equal numbers of hydroxide and hydrogen ions at low concentrations

8

Strong acids...

Fully dissociate

9

Weak acids...

Partially dissociate

10

Name 3 strong acids

Hydrochloric, metric, sulphuric

11

Name 3 weak acids

Boric, carbonic, ethanoic.

12

Tin oxide is a base, describe how you would make tin chloride in a neutralisation reaction.

Mix excess tin oxide with hydrochloric acid, filter off excess. Rinse filter paper with distilled water, heat tin chloride solution in evaporating dish.

13

Why is it critical to use excess copper oxide when making copper sulphate crystals in a neutralisation reaction?

So that all of the acid is neutralised.

14

Nitrate ion

NO3 -1

15

Charge of a sulphate ion

SO4 2-

16

Charge of a carbonate ion

CO3 2-

17

Formula for sodium sulphate

Na2SO4

18

___________________ acid is found in the stomach because...

Hydrochloric acid... Help digest food, kill bacteria.

19

Titration are used when...

Making soluble salts and a know endpoint is needed.

20

Why is universal indicator a poor choice for titrations?

It doesn't have a sharp end point like methyl orang of phenolphthalein

21

Acid and limestone --->

Make salt, water and carbon dioxide

22

Ionic equation for dissociation of ethanoic acid.

CH3COOH --> CH3COO- + H+

23

Ionic equation for magnesium carbonate and hydrochloric acid...

2H+ + CO32- ---> H2O + CO2
Extra brownie points for state symbols.
Magnesium and chloride ions are spectators.

24

Common Sodium, potassium and ammonium salts tend to be...

Soluble

25

All __________ are soluble

Nitrates

26

Potassium chloride, silver chloride, lead chloride... Odd one out

Potassium chloride is soluble

27

Name two suitable reagents to make barium sulphate in a precipitate reaction.

Barium nitrate, potassium/sodium/ammonium sulphate is the obvious choice :-)

28

Turns limewater from colourless to cloudy...

Carbon dioxide.

29

Charge on a hydroxide ion

-1

30

Pipettes are used in titrations instead of measuring cylinders because...

They provide a more accurate and repeatable means of measuring out a know volume of liquid.