How was Chemistry P34?

[Hassam Afzal]

dude exactly what I thought ! but the calculations never got me there ! :/

I see where u made the mistake. u found the concentration of fb4, while u were supposed to find the concentration of fb2, fb4 was diluted fb2.the conc. of fb4 multiplied by 10 was the concentration of fb2.

 

[Nightmare***]

mine

20.95 maybe

what did you get?

mine was 23.5....my supervisor said he had about the same reading

 

[shafayat]

I see where u made the mistake. u found the concentration of fb4, while u were supposed to find the concentration of fb2, fb4 was diluted fb2.the conc. of fb4 multiplied by 10 was the concentration of fb2.

OMG ! haah ! I cant believe I did that mistake !

 

[Hassam Afzal]

what was ur titration reading.....though it varies frm center to center

24.05, 24.05 and 24.10.

 

[shafayat]

and what difference does it make to the value calculated by measuring cylinder rather than a burette

 

[shafayat]

I think I got 20.95, 20.75,20.75,20.80

 

[Nightmare***]

OMG ! haah ! I cant believe I did that mistake !

no worries u wont loose alot of marks....probably 1 or 2

 

[shafayat]

no worries u wont loose alot of marks....probably 1 or 2

yeah, 1 mark!

 

[Hassam Afzal]

and what difference does it make to the value calculated by measuring cylinder rather than a burette

the percentage error would be higher due to lesser sensitivity of measuring cylinder, and there would be higher temperature rise so lesser percentage error in the reading for temperature rise.

 

[shafayat]

the percentage error would be higher due to lesser sensitivity of measuring cylinder, and there would be higher temperature rise so lesser percentage error in the reading for temperature rise.

WHAAAAAAAAAAT? HOWW?
if percentage error is more I wrote accuracy is less

 

[Hassam Afzal]

WHAAAAAAAAAAT? HOWW?
if percentage error is more I wrote accuracy is less

writing lower accuracy is also acceptable.

 

[shafayat]

Thank God ! Alhamdulillah

writing lower accuracy is also acceptable.

 

[saadgujjar]

what is expected GT

 

[sweetjinnah]

i think gt will b around 27-28

 

[talha196]

i wrote percentage error is greater in measuring cylinder therefore more error in conc of fb2
is it write?????????????

 

[talha196]

how to differntiate between ethanol ethanal and ethanoic acid
in frst reagant i wrote sodium as it wont react with ethanal but will react with acid and alcohol
in 2nd reagant i wrote k2cr207 add it to acid and alcohol it will react with alcohol but not with acid and also wrote dont react with already identified ethanal coz it will also react with k2cr207
is it rite plz plz plz tell

 

[shafayat]

how to differntiate between ethanol ethanal and ethanoic acid
in frst reagant i wrote sodium as it wont react with ethanal but will react with acid and alcohol
in 2nd reagant i wrote k2cr207 add it to acid and alcohol it will react with alcohol but not with acid and also wrote dont react with already identified ethanal coz it will also react with k2cr207
is it rite plz plz plz tell

what you wrote looks perfectly correct to me ! (Y)

 

[shafayat]

i wrote percentage error is greater in measuring cylinder therefore more error in conc of fb2
is it write?????????????

yeah but question asked about accuracy? so I think one more sentence should have been added "LESS ACCURATE'

 

[talha196]

yeah but question asked about accuracy? so I think one more sentence should have been added "LESS ACCURATE'

yeah man i wrote that too..... and are you sure about the ethanol ethanal and ethanoic acid one ???

 

[talha196]

fb5 was naoh
fb6 feso4
fb7 mixture of znNo3 and KI
fb8 was lead nitrate
fb9 was na2so4
cnfirmed frm a supervisor​