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Some redox titration questions need help please

I have done these quesitons but I don't have the mark scheme for it. Will appreciate if someone can tell me whether I am right or not.

Q4 : 2cm^3 needed
Q5 : 24.7%
Q6 : 93.7%

1486071182676-1063818746.jpg
Attachment not found


Thanks
(edited 7 years ago)
14860712377982028063192.jpg514.3KB
Reply 1
Avatar for Pigster
Pigster
20
Q4 is deffo not 2.

But I'm too busy to check t'others.
Original post by coconut64
I have done these quesitons but I don't have the mark scheme for it. Will appreciate if someone can tell me whether I am right or not.

Q4 : 2cm^3 needed
Q5 : 24.7%
Q6 : 93.7%

1486071182676-1063818746.jpg
Attachment not found


Thanks


Q5 is correct
Original post by coconut64
I have done these quesitons but I don't have the mark scheme for it. Will appreciate if someone can tell me whether I am right or not.

Q4 : 2cm^3 needed
Q5 : 24.7%
Q6 : 93.7%

1486071182676-1063818746.jpg
Attachment not found


Thanks


Q6 is correct ( I got 94.1, but I used 56 as the Ar of iron.
Reply 4
Avatar for coconut64
coconut64
OP
16
Original post by Pigster
Q4 is deffo not 2.

But I'm too busy to check t'others.


14860777566792028063192.jpg what went wrong ? Thanks
Reply 5
Avatar for Pigster
Pigster
20
Original post by coconut64
what went wrong ? Thanks


Why did you multiply by 100 in the last step?
Reply 6
Avatar for coconut64
coconut64
OP
16
Original post by Pigster
Why did you multiply by 100 in the last step?


Because you want it in cm^3 not dm^3 surely ?
Original post by coconut64
Because you want it in cm^3 not dm^3 surely ?


how many cm3 in a dm3 ?
Reply 8
Avatar for coconut64
coconut64
OP
16
Original post by charco
how many cm3 in a dm3 ?


So the right answer would be 20 ? Thanks

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