PAG 1.1 determination of the composition of copper II carbonate basic

Question 1

method

Answer 1

1) get a tub of water and fill a measuring cylinder with water place it upside down in the tub
2) conical flask with a stopper and a tube going into the cylinder with water
3) weigh 1.5 g of copper II carbonate basic
4) add the solid to the conical flask and replace the bung
5) measure out 50 cm3 of 1.0 mol dm-3 sulphuric acid
6) remove the bung and quickly add the acid to the flask and replace the bung
7) collect the gas in the measuring cylinder and record the final volume of carbon dioxide

Question 2

what are the possible errors?

Answer 2

some carbon dioxide may have escaped before putting the bung on
all the copper carbonate didn’t react
carbon dioxide could have dissolved in the water
some of the copper carbonate remains on the weighing boat

Question 3

how do you resolve the error with carbon dioxide escaping before putting the bung on?

Answer 3

adding copper carbonate to a specimen and place it inside the conical flask before adding the acid

Question 4

how do you resolve the error of not all the copper carbonate reacting?

Answer 4

mixing the conical flask

Question 5

how do you resolve the error of carbon dioxide dissolving in the water?

Answer 5

use a gas syringe

Question 6

how do you resolve the error of some of the copper carbonate staying on the weighing boat?

Answer 6

using the weighing by difference technique