Acids and redox (mod 2)

Question 1

What is an acid?

Answer 1

A proton donor (H+ ions)

Question 2

What is a strong acid?

Answer 2

A strong acid releases all its hydrogen atoms into solution as H+ ions, and completely dissociates in (aq) solution

Question 3

What is a weak acid?

Answer 3

A weak acid only releases a small proportion of its available hydrogen atoms as H+ ions. A weak acid partially dissociates in (aq) solution

Question 4

What is a base?

Answer 4

A base neutralises an acid to form a salt

Question 5

What are some types of bases?

Answer 5

• Metal oxides
• Metal hydroxides
• Metal carbonates
• Ammonia (NH3)

Question 6

What is an alkali?

Answer 6

An alkali is a base that dissolves in water, releasing hydroxide ions (OH-) into the solution

Question 7

What are some common metal oxides?

Answer 7

• MgO
• CaO
• CuO

Question 8

What are some common metal carbonates?

Answer 8

• Na2CO3
• CaCO3
• CuCO3

Question 9

What are some common alkalis?

Answer 9

• NaOH
• KOH
• NH3

Question 10

What happens when an acid is neutralised by a metal oxide//hydroxide?

Answer 10

Forms a salt and water only.

Question 11

`What happens when an acid is neutralised by an alkali?

Answer 11

Forms a salt and water only.

Question 12

What happens when an acid is neutralised by a metal carbonate?

Answer 12

Forms a salt, water and carbon dioxide gas.

Question 13

Uses of titrations

Answer 13

• Finding the concentration of a solution
• Identifying an unknown chemical
• Finding the purity of a substance

Question 14

Error intervals for volumetric flask

Answer 14

100cm^3 +/- 0.2cm^3

250cm^3 +/- 0.3cm^3

Question 15

Error intervals for pipette/burette

Answer 15

• 10cm^3 pipette +/- 0.04cm^3
• 25cm^3 pipette +/- 0.06cm^3
• 50cm^3 burette +/-0.10cm^3

Question 16

read pages 44-45 for titrations (note to self)

Answer 16

Keep up the good revision