Chem.p34 answer discussion...

[aaditya menon]

i have great deviation aapprox around 10cm3 from the corect one but i did all calculations corect how many marks will i loose .?

-2 maximum. Think it should be -1 for accuracy, but you shouldn't lose more than that. Chill

 

[aaditya menon]

Moderator Edit : No Paper Content Within 24 Hours of the Paper

NO Paper discussion BEFORE 24hrs!!​

Your readings should be similar to your supervisor's. Depends on how many questions in the calculations you did, if you didn't do any, but have done the rest well, you shouldn't drop below B.

My bad, sorry.

 

[mariamalik]

i have great deviation aapprox around 10cm3 from the corect one but i did all calculations corect how many marks will i loose .?

u know the correct value ??? what was it ??

 

[mariamalik]

The paper was easy but i couldnt do it on time and i burned my fingure in 1st qs what was the titration reading ??

 

[mury456]

The paper was easy but i couldnt do it on time and i burned my fingure in 1st qs what was the titration reading ??

haha ... sme here .. burned my thumb ....
reading was 13cm3 1st tritration and 22cm3 2nd titration

 

[Saad (سعد)]

Oi!

Whatever happened to the 24 hr rule?

 

[Natashakhan]

fr the frst one i got 18 sumthn :/ and fr scnd one i got 19 sumthn
wat about the % mass?
and non metal\?

 

[angelgirl:)]

Mine went incomplete. >_>

lol...same here

 

[angelgirl:)]

Couldn't finish on time The calculations that is. Salt analysis took too long to do.

This sucks.

i nooo

 

[angelgirl:)]

The paper was easy but i couldnt do it on time and i burned my fingure in 1st qs what was the titration reading ??

meee despite of wearing goggle i droped KMNO4 on my face while i was removing the funnle from the burette..

 

[angelgirl:)]

i didnt do well....but i left everything on Allah now...wat ever we deserve we will get it InshaAllah...better to pray dan wasting our time in regrating and all....

 

[Saad Sarfraz]

i have great deviation aapprox around 10cm3 from the corect one but i did all calculations corect how many marks will i loose .?

Only 2 marks the rest depends upon your method of calculations and im pretty sure caz i appeared in variant 3 and my titre was 8cm about the invigilators asked my sir he said only 2 marks

 

[mariamalik]

haha ... sme here .. burned my thumb ....
reading was 13cm3 1st tritration and 22cm3 2nd titration

really ??? mines was 18 something and 21 something for the second.

 

[mariamalik]

meee despite of wearing goggle i droped KMNO4 on my face while i was removing the funnle from the burette..

omg u okay ??

 

[N.M]

For the step 1 I got 16.20 cm3
N for step 2, I got 23.25cm3

 

[Soulgamer]

The titre value for step 1 was : 15.50 cm3
The titre value for step 2 was: 22.55 cm3

The percentage by mass : 43% but don't worry, whosoever attempted this part will be given full marks as there was a misprint in the paper for the formula given.

The non metal was Nitrogen.

Fe2+ was in FB9.

The last part of salt analysis was that if KMnO4 was added to FB9, what happened.
You could write:
1) Colour change from purple to colourless.
2) Fe2+ will be oxidized to Fe3+ so red-brown ppt will be formed.

 

[Natashakhan]

evryone gets a diffrnt titre value ryt? :S
fr the last part i wrote ornge brown ppt seen :/

 

[Natashakhan]

and my % mass was diffrnt too :S

 

[ass]

The titre value for step 1 was : 15.70 cm3
The titre value for step 2 was: 15.30 cm3

for both titrations almost the same..

 

[N.M]

What was the answer for the last two parts of titration?
The part which talked abt pipette n burette measuring 25cm3?
N also what were the observations for the anion test?