Acids, Alkalis and Salts Flashcards Preview

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Flashcards in Acids, Alkalis and Salts Deck (24):
0

What colour does litmus go in acid?

Red

1

What colour does litmus hi in alkali?

Blue

2

What colour does phenophalein go in acid?

Colourless

3

What colour does phenophalein go in alkali

Magenta pink

4

What colour does methyl orange go in acid?

Red

5

What colour does methyl orange go in alkali?

Yellow

6

What is the definition of an acid?

A substance which is a source of hydrogen ions H+

7

What is the definition if an alkali?

A substance which is a source of Hydroxide ions, OH-

8

What are the three general reactions of acids?

Acid + metal = Salt + hydrogen
Acid + base = salt + water
Acid + metal carbonate = salt + water
+ carbon dioxide

9

Give an example of a reaction of
Acid + metal = salt + hydrogen

Hydrochloric+magnesium=magnesium
Acid. Mg(s). Chloride
2HCl (aq). MgCl2(aq)

+hydrogen H2(g)

10

Give an example of
Acid+base=salt +water

Sulphuric+sodium=sodium+water
Acid Hydroxide sulphate. 2H2O(l)
H2SO4(aq) 2NaOH(aq) Na2SO4(aq)

11

Give an example of
Acid+metal =salt+water+Carbon
carbonate. Dioxide

Nitric+calcium= calcium+water+carbon
Acid. Carbonate nitrate. Dioxide
2HNO3(aq)+CaCO3(s)=Ca(NO3)2(aq) +
H2O(l) + Co2(g)

12

Why don't sodium and potassium react with acids?

TOO VOILENT

13

Why doesn't copper (Cu) react with acid?

Bellow H (hydrogen) in the reactivity series.

14

What is the salt produced by:
Hydrochloric Acid, HCl

Metal chloride

15

What is the salt produced by:
Sulphuric Acid, H2SO4

Metal sulphate

16

What is the salt produced by:
Nitric Acid, NHO3

Metal nitrate

17

SALT IN WATER
•All sodium, potassium & ammonium salts
•All Nitrates
•All Chlorides
•All Sulphates
ARE ALL SOLUBLE IN WATER

EXCEPTIONS
•All chlorides........except sliver chloride
•All Sulphates..except Barium sulphate &Calcium sulphate

18

ALL COMMON CARBONATES ARE INSOLUBLE ....except which 3?

•Sodium Carbonate
•Potassium Carbonate
•Ammonium Carbonate

19

PREPARATION OF SALT:
Name the 7 step method to form crystals of salt which is used for ...
1.) Acid+Metal 2.) acid+insoluble base
3.) acid+insoluble carbonate

1.) Add metal/Base/Carbonate to 25cm3 of Acid
2.) warm and stir
3.) until no solid remains
4.) metal and carbonate- no bubbles
5.) filter
6.) evaporate solution to the point of crystallisation
7.) leave to cool -CRYSTALS FORM

20

State the 5 step method for PREPARATION OF INSOLUBLE SALTS. (Precipitation reactions)

1.) 25cm3 of barium chloride solution in a beaker
2.) add 25cm3 of sodium sulphate
3.) PRECIPITATE OF BARIUM SULPHATE FORMS
4.) filter solid off
5.) leave to dry

21

What is the equation for the precipitation reaction of preparation of insoluble salts?

Na2SO4+BaCl2(aq)=BaSO4(s)+.
2NaCl(aq)

22

What do we use TITRATIONS for?

Preparation of salt from ACID+ALKALI

23

What is the 7 step method for a TITRATION?

1.)pipettes 25cm3 of alkali into conical flask
2.) Add 3 drops of indicator
3.) add acid from burette 1cm3 at a time until indicator changes colour
4.) record reading at start and end from burette
5.) subtract to get volume of acid added
6.) repeat experiment adding acid to within 1cm3
7.) add drop wise until indicator first changes colour.