Acid, Alkalis, Bases And Salts

Question 1

Whats a base?

Answer 1

A substance with a PH greater than 7

Question 2

Whats an alkali?

Answer 2

A base dissolve in water (PH greater than 7)

Question 3

What ions do alkalis form in water?

Answer 3

OH-

Question 4

What ions do acids form in water?

Answer 4

H+

Question 5

Whats a reaction between acids and bases called?

Answer 5

Neutralisation Reaction

Question 6

Whats the equation for reacting an acid and a base?

Answer 6

Acid + Base -> Salt + Water

Question 7

Whats the acid and base reaction equation in terms of ions?

Answer 7

H+ + OH- -> H2O

Question 8

What does Aq stand for?

Answer 8

Aqueous

Question 9

Whats the equation for a metal reacting with a acid?

Answer 9

Acid + Metal -> Salt + Hydrogen

Question 10

Why does copper not react with dilute acid?

Answer 10

It is less reactive than hydrogen

Question 11

Metal oxides and hydroxides react with water to form what?

Answer 11

Salt and water

Question 12

How do you make soluble salts using a metal, metal oxide or metal hydroxide?

Answer 12

1) Add metal, metal oxide or metal hydroxide to the acid. Solid dissolves.
2) Filter out excess metal to get pure crystals of salt.

Question 13

Explain how you make soluble salts using alkali.

Answer 13

1) Add right amount of alkali to neutralise acid and need an indicator.
2) Measure amount needed and use this amount to avoid contamination.
3) Evaporate water.

Question 14

How do you make insoluble salts?

Answer 14

1) Precipitation reaction.
2) Mix solutions with ions you need.
3) Filter, wash and dry.

Question 15

Whats an acid?

Answer 15

A substance with a PH under 7