Acids and bases

Question 1

pH scale goes from

Answer 1

0 to 14

Question 2

Acid + base =

Answer 2

Salt + water

Question 3

What is an acid

Answer 3

A substance that forms aqueous solutions with a pH of less than 7, and forms H+ ions in water

Question 4

What is a base

Answer 4

A substance with a pH greater than 7, that neutralises and acid

Question 5

What is an alkali

Answer 5

A base that dissolves in water to form a solution with a pH greater than 7, and forms OH- ions in water

Question 6

Titration practical

To find the conc of some …:
1. Using a … and a pipette filler add a … volume of the … to a conical … and add …-3 drops of …
2. Use a f… to fill a burette at … level, with an acid of a known …, and record the …
3. Using the b… add the a… to the alkali …
4. The indicator is … in alkaline condition and … in acidic conditions
5. Record the f… volume of a… in the burette and s… it from the initial v…
6. To increase a… remove … results and … the experiment

Answer 6

To find the conc of some alkali:
1. Using a pipette and a pipette filler add a set volume of the alkali to a conical flask and add 2-3 drops of phenolphthalein
2. Use a funnel to fill a burette at eye level, with an acid of a known concentration, and record the volume
3. Using the burette add the acid to the alkali slowly
4. The indicator is pink in alkaline condition and colourless in acidic conditions
5. Record the final volume of acid in the burette and subtract it from the initial volume
6. To increase accuracy remove anomalous results and repeat the experiment

Question 7

What is a strong acid

Answer 7

-they ionise completely in water
-all acid particles dissociate to release H+ ions

Question 8

What are weak acids

Answer 8

-they do not full ionise in solution
-only a small proportion of acid particles dissociate to release H+ ions

Question 9

What is pH a measure of

Answer 9

The concentration of H+ ions in a solution

Question 10

For every decrease of 1 on the pH scale how much does the concentration of H+ ion increase

Answer 10

By a factor of 10

Question 11

Acid + metal oxide =

Answer 11

Salt + water

Question 12

Metal + acid =

Answer 12

Salt + hydrogen

MASH

Question 13

acid + metal hydroxide =

Answer 13

Salt + water

Question 14

Acid + metal carbonate =

Answer 14

salt + water + carbon dioxide

Question 15

Metal + water =

Answer 15

Metal hydroxide + hydrogen