Acids, Bases And Salts

Question 1

Acids have a pH of less than …..

Answer 1

7

Question 2

The more strongly acidic the solution, the …. The pH number

Answer 2

Lower

Question 3

Acidic solutions turn blue litmus paper …

Answer 3

Red

Question 4

Acids turn universal indicator … If they are strongly acidic

Answer 4

Red

Question 5

What are bases?

Answer 5

Substances that can react with acids and neutralise them to make a salt and water.

Question 6

Alkaline solutions have a pH of more than …

Answer 6

7

Question 7

Alkalis turn universal indicator paper ….

Answer 7

Dark blue or purple

Question 8

What are ions?

Answer 8

Charged particles that have lost or gained electrons.

Question 9

What does (aq) mean?

Answer 9

Dissolved in water

Question 10

What acids dissolve in water, they produce aqueous ….. Ions

Answer 10

Hydrogen

Question 11

When hydrochloride acid is dissolved in water, which is the dissolved hydrogen ion?

HCL(aq) –) H+^(aq) + CL^-(aq)

Answer 11

H+^(aq)

Question 12

When alkalis dissolve in water, they produce aqueous …. Ions

Answer 12

Hydroxide

Question 13

In sodium hydroxide, which is the aqueous hydroxide ion?

NaOH(aq) +?Na+^(aq) + OH-^ (aq)

Answer 13

OH-^(aq)

Question 14

When the H+^(aq) ions from an acid react with the OH-^(aq) ions from an alkali, a neutralisation reaction occurs to form water. What is the equation for the reaction?

Answer 14

H+^(aq) +OH-^(aq) –) H2^O(l)

Question 15

When acids react with bases, what two things are made?

Answer 15

Salt and water

Question 16

Acids will react with reactive metals, such as magnesium and zinc to make…. (2 things)

Answer 16

A salt and hydrogen

Question 17

How do you make a soluble salt if the base dissolves in water?

Answer 17

1) You add just enough acid to make a neutral solution.

2) warm the solution to evaporate the water

Question 18

How do you make a base that doesn’t dissolve in water?

Answer 18

you add the base to the acid until no more will dissolve, then filter the mixture to remove the excess base, then evaporate the water in the filtrate to leave the salt behind.