chemistry atp last question 2017 ph level?

[ujoolicious]

everyone had different answers and none of them matched mine. 2-3 marks on the line people.

 

[A*****]

What did u write?

 

[ujoolicious]

i wrote pH 3
What about you?

 

[A*****]

I wrote 5.6 but the correct ans was 7

 

[ujoolicious]

most titrations use sharp indicators hence the color changes occur at diff pH levels
if the neutralizing point was 7 then the concentration factor should have been same as NaOH

in every graph question a value differs the change
hence at pH 3 THE POINT DID NOT MEET THE SMOOTH CURVE
should have been the ans
not sure though

 

[A*****]

I applied some sort of the same strategy but the question was a slight variation of a question from w12...and the ans given there was 7

 

[iamhereforfun]

and what was the explanation for the use of apparatus Y for the drying agent

 

[Anon_Assassin]

What variant was the paper?

 

[iamhereforfun]

42

 

[iamhereforfun]

the second question

 

[iamhereforfun]

I put pH 7 for the end-point and concentration as 0.46dm3 im not sure whether it was correct

 

[A*****]

and what was the explanation for the use of apparatus Y for the drying agent

Something like the gas is released below the surface of the drying agent and the dry gas will be collected as it will rise up

 

[A*****]

I put pH 7 for the end-point and concentration as 0.46dm3 im not sure whether it was correct

It is correct

 

[iamhereforfun]

Hey i remember writing something like this thanks a lot

Something like the gas is released below the surface of the drying agent and the dry gas will be collected as it will rise up

 

[Anon_Assassin]

I wrote something in the range of 0.43-0.47
I know the answer but i forgot because of my other exams
xD

 

[A*****]

I wrote something in the range of 0.43-0.47
I know the answer but i forgot because of my other exams
xD

The correct ans was 0.455

 

[ujoolicious]

do you guys think an ecf would be involved in this q

 

[Muzammil ahmad]

do you guys think an ecf would be involved in this q

Yes definitely.
I myself got 0.32 so e.c.f will be applied According to the
Graph u made but the answer difference must not
Be too much

 

[Anon_Assassin]

I don't think so

 

[Muzammil ahmad]

Lol why not?
It was a graph question.
Many people had varying answers..
Incase you don't know.
E.c.f is applied in graph qs..