Assessed practical

Question 0

Concentration

Answer 0

Concentration=Moles/Volume

Question 1

Moles=

Answer 1

Moles= Mass/RFM

Question 2

Moles of gas=

Answer 2

Moles of gas= Volume/24 (if dm^3)

Question 3

Why should you fill the measuring cylinder with water?

Answer 3

The water creates a seal which allows the CO2 to displace the water.

Question 4

How much Volume of CO2 should be produced?

Answer 4

Mole ration to work out moles of CO2 using other elements.
Moles gas equation
calcc vol gas in cm3 by x1000

Question 5

How to calculate excess

Answer 5

How much of each should be produced?
Which is limiting?
Calculate how much of the other is used?
Moles-moles used=excess.

Question 6

How can we increase rate?

Answer 6

Temperature, smaller particle size (ie crush the CaCO3), increase concentration.

Question 7

Would increased rate increase the amount of gas produced?

Answer 7

No because there are the same amount of moles of substance.

Question 8

How to calculate error?

Answer 8

(Error margin/measurement) x 100= %

Question 9

Can error be caused by excess solid?

Answer 9

No because the solid is already in excess and is limited by the moles of HCl.

Question 10

Can a gas syringe reduce error?

Answer 10

Yes, because CO2 can dissolve in water in our method some CO2 gas could not be collected.

Question 11

Would a dropping funnel reduce error?

Answer 11

No because there is a volume error if a dropping funnel is used because it displaces air out of the flask.

Question 12

CaCO3 + 2 other lab acids?and which will produce more gas?

Answer 12

CaCO3 + 2HNO3 -} Ca(NO3)2 + H2O + CO2
CaCO3 + H2SO4 -} CASO4 + H2O + CO2

H2SO4 because it has a 1:1 ratio.