pH scale and indicators

Question 1

When an acid is dissolved in water, we get an…

Answer 1

..acidic solution.

Question 2

When a base dissolves in water we get an …

Answer 2

…alkaline solution.

Question 3

If a solution is neither acidic nor alkaline…

Answer 3

…it’s neutral.

Question 4

What are indicators?

Answer 4

-substances that change colour when they are added to acidic or alkaline solutions
-most common one is universal indicator

Question 5

Alkali

Answer 5

-base that is soluble in water

Question 6

Acid

Answer 6

-corrosive substance with a pH lower than seven

Question 7

What causes acidity?

Answer 7

-high concentration of hydrogen ions

Question 8

pH

Answer 8

-scale of acidity or alkalinity

Question 9

When acids dissolve in water…

Answer 9

…they produce hydrogen ions.

Question 10

When alkalis dissolve in water…

Answer 10

…they produce hydroxide ions.

Question 11

When a neutralisation reaction occurs to form water..

Answer 11

…hydroxide ions (-) react with hydrogen ions (+).

Question 12

How can we tell an acid is strong?

Answer 12

-from how well it disassociates
e.g. when an acid reacts with water, it disassociates, producing hydrogen ions

Question 13

The stronger the acid…

Answer 13

… the more it can split and release those hydrogen ions.
…the more violently it will react with metals and carbonates (more fizzing and raise the temperature)

Question 14

Less disassociation…

Answer 14

…less of a reaction