Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry Practicals > Pag 1 - mol determination > Flashcards

Pag 1 - mol determination Flashcards

You may prefer our related Brainscape-certified flashcards:
Periodic Table flashcards Chemistry 101 flashcards AP® Chemistry flashcards Organic Chemistry 101 flashcards
1
Q

What is the method for the determination of compositiion of copper (II) carbonate

A
  • weigh 1.5g of CuCO3.Cu(OH)2 add to conical flask
  • measure 50cm3 of H2SO4 in a 50cm3 measuring cylinfer
  • add H2SO4 into the concical flak and immeridatley insert stopper
  • gas will collect in measuring cyclineder
  • record final volume of CO2 in measuring cylinder
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the calculations for determination of compositiion of copper (II) carbonate

A
  • calculate volume of CO2 collected
  • work out amount of CuCO3 reacted in moles
  • calculate the percentage by mas of CuCO3 in CuCO3.Cu(OH)2
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the errors in determination of compositiion of copper (II) carbonate and how do you overcome them

A
  • CO2 can ecape before bung inserted - insert bund soon as acid been poured in conical flak
  • some copper carbonate may not react - swirl flask to mix contentents ensure reaction go to completion
  • CO2 dissolve in water - use gas syring to measure CO2 measured
  • some copper carbonate may remain in weighing boat not transferred to conical flask - add copper carbonate from boat into conical flask reweigh boat and difference in masses is exact mass of copper carbonate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the hazards of determination of compositiion of copper (II) carbonate

A
  • CuCO3.Cu(OH)2 - eye irritation , harmuful when inaheld or swallowed
  • sulfuric acid - severe skin burns and eye damage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Describe method 1 for the determination of relative atomic mass of magneium

A
  • add 10cm3 of sulfuric acid to conical flask
  • weigh 0.15g of magneuym add magnesuym to acid place bung into flask immediatley
  • gas produced collect in measuring cylinder
  • record final colume of hydrogen into a measuring cylinder
  • retain solution
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Decribe method 2 for the determination of relative atomic mass of magneium

A
  • weigh clean evaporating basin
  • pour olution form method 1 into evaporating basin
  • rinse conical flask with distilled water and add washing to evaporating basin
  • evaporate until dry solid in evaporating basin
  • leave cool leave solid magnesium suplahte mass is difference final mass and mass of empty basin
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the calculation for the determination of relative atomic mass of magneium

A
  • mols of magnesium sulphate
  • work out amount Mg in MgSO4
  • ue original mass of Mg calculate relative atomic mass of magnesium
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Describe the errors in determination of relative atomic mass of magneium and how to overcome them

A
  • imilar to determination of componition of copper (II) carbonate
  • solid magnesium sulphate not completely dry - ensure complete dryness heat until mass no longer changes
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the safety measures in determination of relative atomic mass of magneium

A
  • sulfuric acid - sever burns and eye damage
  • magnesium - flammable
How well did you know this?
1
Not at all
2
3
4
5
Perfectly

Chemistry Practicals (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions