Neutralistation

Question 1

What are the color changes of methyl orange?

Answer 1

Acid - red
Neutral - orange
Alkaline - yellow

Methyl orange is a pH indicator commonly used in titrations.

Question 2

What are the color changes of screened methyl orange?

Answer 2

Acid - orange-red
Neutral - green
Alkaline - green

Screened methyl orange is a modified version that provides different color transitions.

Question 3

What are the color changes of phenolphthalein?

Answer 3

Acid - colourless
Neutral - colourless
Alkaline - pink

Phenolphthalein is another commonly used pH indicator.

Question 4

What is an alkali?

Answer 4

A soluble base

Alkalis are bases that dissolve in water, producing hydroxide ions.

Question 5

What is a salt?

Answer 5

A compound formed when some or all of the hydrogen ions in an acid are replaced by metal ions or ammonium ions

Salts are typically formed through neutralization reactions.

Question 6

What should you apply to a bee sting for neutralization?

Answer 6

Baking powder

Baking powder is alkaline and can help neutralize the acidity of the venom.

Question 7

What is the difference between an alkali and alkaline?

Answer 7

An alkali is a water soluble base; alkaline refers to the property of a solution having a pH greater than seven

Understanding this distinction is important in chemistry.

Question 8

What are the colour changes of red litmus paper?

Answer 8

Acid - red
Neutral - red
Alkaline - blue

Question 9

What are the colour changes of blue litmus paper?

Answer 9

Acid - red
Neutral - blue
Alkaline - blue

Question 10

What are the colour changes of universal indicator?

Answer 10

Acid - red
Neutral - green
Alkaline - purple

Question 11

What are the colour changes of methyl orange?

Answer 11

Acid - red
Neutral - orange
Alkaline - yellow orange

Question 12

What are the colour changes of screened methyl orange?

Answer 12

Acid - orange-red
Neutral - green
Alkaline - green

Question 13

What are the colour changes of phenolphthalein?

Answer 13

Acid - colourless
Neutral - colourless
Alkaline - pink

Question 14

What is an alkali?

Answer 14

Is a soluble base

Question 15

What is the reaction of metal with acid?

Answer 15

Metal + acid = Salt + hydrogen

Question 16

What is the reaction of acid with alkali?

Answer 16

Acid + alkali = Salt + water

Question 17

What is the reaction of acid with base?

Answer 17

Acid + base = Salt + water

Question 18

What is the reaction of acid with metal carbonate?

Answer 18

Acid + metal carbonate = Salt + water + carbon dioxide

Question 19

What is a base?

Answer 19

A substance that can react with an acid to neutralise it resulting in the formation of a salt and water. All alkalis are bases but not all bases are alkalis.

Metal oxides.

Question 20

What is an indicator?

Answer 20

It’s a chemical that gives a colour change in acidic, alkaline and neutral solutions.

Question 21

What type of scale does the universal indicator use?

Answer 21

pH scale 1-6 acidic, 7 neutral, 8-14 alkaline.

Question 22

What is neutralisation?

Answer 22

The reaction between an acid and an alkali producing salt and water.

Question 23

What salt is formed when the acid is hydrochloric acid?

Answer 23

Chloride.

Hydrochloric acid + calcium carbonate = calcium chloride.

Question 24

What salt is produced when the acid is sulphuric acid?

Answer 24

Sulfate.

Sulphuric acid + calcium carbonate = calcium sulfate.

Question 25

What salt is produced when the acid is nitric acid?

Answer 25

Nitrate. ## Footnote Nitric acid + calcium carbonate = calcium nitrate.

Question 26

What is soil treatment (neutralisation)?

Answer 26

Plants grow best in pH 7 soil, so chemicals (lime) are added to raise the pH of acidic soil.

Question 27

What is indigestion (neutralisation)?

Answer 27

Indigestion is when there is too much hydrochloric acid in our stomach and the acid comes up the oesophagus; to neutralise, we take indigestion tablets.

Question 28

What is the general reaction of metal and acid?

Answer 28

Metal + acid = Salt + hydrogen.

Question 29

What are some examples of everyday neutralisation

Answer 29

Indigestion remedies Lime in acidic soil Baking powder on a bee sting. Vinegar on a wasp sting

Question 30

Which is better to neutralise stomach indigestion? Rennies or burpease

Answer 30

Rennie as it required more acid to neutralise

Question 31

If you chew an indigestion tablet , what sort of chemical is it

Answer 31

Base/alkali

Question 32

What acid is found in the stomach

Answer 32

Hydrochloric acid

Question 33

Acid + metal (base)(alkali) =

Answer 33

Salt + water