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How was chem p34

Messages
5
Reaction score
0
Points
11
did they ask to identify 2 anions or only one anion? And did they give two different blanks for anions or just one? I can't remember whether I wrote only sulfate or sulfate/sulfite. If they gave 2 blanks like they did for cations then I wrote it properly..
 
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31
Reaction score
12
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18
oh my god i just realised i forgot to convert joules to KJ... i got the right value but i forgot to convert!! how many marks am i losing here??
 
Messages
152
Reaction score
28
Points
38
Q.1) Titration
  • At my centre, supervisor's titre value = 26.00 cm3
  • My mean titre value (Volume of FB2 used) = 26.25 cm3
Q.2) Enthalpy change
  • Temperature fall in 1st experiment = 8.0 °C
  • Temperature fall in 2nd experiment = 13.0 °C
  • Mean temperature fall = 10.5 °C
  • Enthalpy change of solution = +14.7 kJ/mol
  • 1st Experiment had greater % error because smaller mass was used.
  • % error = 6.25%
Q.3) Salt Analysis
  • Cation in FB4 = Manganese (II)
  • Anion in FB4 = Chloride
  • Suggested cations in FB5 = Magnesium or Aluminium
  • Suggested anions in FB5 = Sulfate or Sulfite
  • Cation in FB5 = Magnesium (II)
  • Cations in FB6 = Ammonium and Iron (III)
 
Messages
499
Reaction score
584
Points
103
Q.1) Titration
  • At my centre, supervisor's titre value = 26.00 cm3
  • My mean titre value (Volume of FB2 used) = 26.25 cm3
Q.2) Enthalpy change
  • Temperature fall in 1st experiment = 8.0 °C
  • Temperature fall in 2nd experiment = 13.0 °C
  • Mean temperature fall = 10.5 °C
  • Enthalpy change of solution = +14.7 kJ/mol
  • 1st Experiment had greater % error because smaller mass was used.
  • % error = 6.25%
Q.3) Salt Analysis
  • Cation in FB4 = Manganese (II)
  • Anion in FB4 = Chloride
  • Suggested cations in FB5 = Magnesium or Aluminium
  • Suggested anions in FB5 = Sulfate or Sulfite
  • Cation in FB5 = Magnesium (II)
  • Cations in FB6 = Ammonium and Iron (III)
only thing i think is wrong here is the % error which i also got wrong.
 
Messages
1,743
Reaction score
5,342
Points
523
Q.1) Titration
  • At my centre, supervisor's titre value = 26.00 cm3
  • My mean titre value (Volume of FB2 used) = 26.25 cm3
Q.2) Enthalpy change
  • Temperature fall in 1st experiment = 8.0 °C
  • Temperature fall in 2nd experiment = 13.0 °C
  • Mean temperature fall = 10.5 °C
  • Enthalpy change of solution = +14.7 kJ/mol
  • 1st Experiment had greater % error because smaller mass was used.
  • % error = 6.25%
Q.3) Salt Analysis
  • Cation in FB4 = Manganese (II)
  • Anion in FB4 = Chloride
  • Suggested cations in FB5 = Magnesium or Aluminium
  • Suggested anions in FB5 = Sulfate or Sulfite
  • Cation in FB5 = Magnesium (II)
  • Cations in FB6 = Ammonium and Iron (III)
did you copied mine ? lol i got the same results as you except for the titre i was getting 26.5 whereas my supervisor was getting 25.8 :/ how much marks will i be losing in this ? :(
another thing;i used my titration results for my moles calculation (obviously) if my titre volume was incorrect will i be getting ecf? -_- how much i'll be losing in Question 1?
 
Messages
499
Reaction score
584
Points
103
did you copied mine ? lol i got the same results as you except for the titre i was getting 26.5 whereas my supervisor was getting 25.8 :/ how much marks will i be losing in this ? :(
another thing;i used my titration results for my moles calculation (obviously) if my titre volume was incorrect will i be getting ecf? -_- how much i'll be losing in Question 1?
3 marks as my supervisor told me. Nothing else.
Nig i was getting the same
how did you calculate?
 
Messages
152
Reaction score
28
Points
38
did you copied mine ? lol i got the same results as you except for the titre i was getting 26.5 whereas my supervisor was getting 25.8 :/ how much marks will i be losing in this ? :(
another thing;i used my titration results for my moles calculation (obviously) if my titre volume was incorrect will i be getting ecf? -_- how much i'll be losing in Question 1?
lol not copied, it's just the same. Probably 3 to 4 marks, examiner will consider ecf so don't worry for moles calculation
 
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