Acids and Alkali

Question 1

3 properties of an acid

Answer 1

acids have a sour taste, acids can be corrosive, and acids can react with alkalis

Question 2

3 properties of an alkali

Answer 2

alkalis can be corrosive, alkalis feel ‘soapy’, and alkalis neutralise acids

Question 3

common acids

Answer 3

citric acid, ethanoic acid, carbonic acid , ascorbic acid, sulfuric acid , hydrochloric acid

Question 4

common alkalis

Answer 4

calcium hydroxide, ammonia , magnesium hydroxide , sodium hydroxide.

Question 5

PH Scale

Answer 5

0-4 is a strong acid, 5-6 is a weak acid, 7 is neutral, 8-10 is a weak alkali,12-14 is a strong alkali

Question 6

PH Scale colours

Answer 6

1 is red , 3 is orange, 6 is yellow , 10 is blue , 13 is purple.

Question 7

what is a universal indicator used for

Answer 7

to see if an acid or alkali is weak or strong , it is also used to identify neutral substances

Question 8

universal indicator method

Answer 8

1. place a small amount of solution into a test tube
2. add 1 drop of universal indicator
3. note the colour and compare it to the pH chart
4. record results

Question 9

universal indicator conclusion

Answer 9

hydrochloric acid was the strongest acid, it turned red with a ph of 1/2. the weakest acid is vinegar (ethanoic acid) which turned orange/yellow with a ph of 4/6.
sodium hydroxide was the strongest alkali it turned purple with a ph of 12/14. the weakest alkali was baking soda which turned dark green /blue with a ph of 8/9.

Question 10

apparatus used in neutralisation experiment

Answer 10

measuring cylinder, conical flask, teat pipette, bunsen burner , tripod, heatproof mat, evaporation dish

Question 11

Hydrochloride acid makes

Answer 11

Chloride

Question 12

Sulfuric acid makes

Answer 12

Sulfate

Question 13

Nitric acid makes

Answer 13

Nitrate