Acids and alkaline

Question 1

Acids

Answer 1

0 - 6
Any substance that forms an aqueous solution with a PH less than 7

Question 2

Alkaline

What is a base

Answer 2

8 - 14

Any substance with a PH greater than 7

Question 3

What term can be used to describe solutions with a pH of 7?

Give an example of a neutral substance

Answer 3

Neutral

Pure water

Question 4

2 ways you could measure PH

Answer 4

Using a chemical indicator - universal indicator
Using a PH probe which gives accurate results

Question 5

Hydrogen equation

That will form h2o

Answer 5

H(+) + OH(-) → H20

Question 6

What would metal oxide + acid form

Answer 6

salt + water

Question 7

How does the salt form

Answer 7

You take the negative ion from the acid and combine it with the positive ion from the base

Question 8

What does PH mean

Answer 8

A measure of the hydrogen ions (H+) concentration of the solution

Question 9

What is the strength of an acid

Answer 9

How much ion dissociates (splits)

Question 10

Concentration

Answer 10

The amount of acid molecules in a given volume of a solution

Question 11

What are bases

Answer 11

Bases are a chemical which can neutralise acids and produce saltand water

Bases which are soluble in water are called alkalies

Question 12

What does dilute mean

Answer 12

weak

Question 13

What does concentrated mean?

Answer 13

A relatively large quantity of substances present in a amount of a mixture

Answer 14

Part 1 - Obtain a solution of the soluble salt that we want

Place dilute acid in a beaker and heat gently.
Add the solid base bit by bit until it stops reacting, which means it’s in excess.
Isolate the salt solution by filtering out the excess solid base using filter paper and a funnel.

Part 2 - Isolate the soluble salt crystals from the solution

Heat the salt solution gently in a water bath until crystals start to form.
Let the solution cool further, which will cause more crystals to precipitate.
Filter out the soluble salt crystals using filter paper and funnel.

Question 15

What ions are in acids and alkali

Answer 15

Acids produce hydrogen ions in solutions H+
Alkali release hydroxide ions OH-

Question 16

What colour is neutral in litmus paper

Answer 16

purple

Question 17

What factor does the Ph scale work in

Answer 17

Factor of 10
So if the Ph goes down by one the concentration of hydrogen ions increasing by 10

Question 18

Test for hydrogen gas

Answer 18

Light a splint
Place thr burning splint into the hydrogen gas
The hydrogen burms with a squeaky pop

Question 19

Test for carbon dioxide

Answer 19

Pour limewater into a teat tube or beaker
Bubble the gas into the limewater
The carbon dioxide will turn the limewater milky/cloudy