Soluble and Insoluble Salts

Question 1

describe how to create a salt using soluble bases in 3 steps

Answer 1

1. use titration to find the exact volume of the soluble base needed to react with the acid
2. mix them to produce a solution of salt and water
3. warm the salt solution to evaporate the after and leave salt crystals of salt behind

Question 2

what are the 6 steps to doing a titration

Answer 2

1. put acid into the burette
2. use a pipette to put a known volume of alkali into a conical flask
3. put a few drops of suitable indicator solution (methyl orange/phenolphthalein) into the alkali
4. record the burette and start reading
5. add acid to the alkali until the colour changes
6. record how much acid you used

Question 3

what it titre

Answer 3

the volume of acid that is needed to neutralise an alkali exactly

Question 4

what are concordant results

Answer 4

results that are within 0.1 of each other

Question 5

what are 3 steps to take to get more accurate titration results

Answer 5

• swirl the flask continuously
• near the end at acid drop by drop
• make sure to rinse the flask to remove the remaining solution before re-attempting

Question 6

what types of precipitates are always soluble

Answer 6

all nitrates

Question 7

common chlorides are _________ except for what exceptions

Answer 7

silver chloride
lead chloride

Question 8

common hydroxides are _________ except for what exceptions

Answer 8

sodium hydroxide
potassium hydroxide
ammonium hydroxide

Question 9

common sulfates are _________ except for what exceptions

Answer 9

lead sulfate
barium sulfate
calcium sulfate

Question 10

common carbonate are __________ except for what exceptions

Answer 10

sodium carbonate
potassium carbonate
ammonium carbonate

Question 11

predict whether a precipitate forms when sodium carbonate and calcium chloride react, if they do name the precipitates

Answer 11

calcium carbonate precipitate will form