cameroon gce advanced level 2020 chemistry 2
cameroon gce advanced level 2020 chemistry 2
An iron ore contains iron (II) carbonate. PeCOj. The percentage of iron (II) in the ore can be determined by titration
with acidified potassium dichrovnatc ( VI) . Ihe ionic equation is shown below.
(Cr a)2072 A 5.00 (aqg)sample + 141ol T(the aq)ore + 6was Fc2reacted *(nq)—withCru excess (aqconcentrated ) + 6F3 f(oqhydrochloric ) + 7II20(I)acid and filtered. The filtrate was made up to
250 cm in a volumetric flask with distilled water. A 25.0 cm1 sample of the standard solution required 27.30 cm1 of 0.020
mol dm 1 dichromate (VI) solution lor complete reaction.
Calculate:
(i) the amount, in moles,ofdichromate (VI) ions used in the titration.
(ii) the amount, in moles,ofl:e!* ions present in 25 cm‘ of solution
(iii) the mass of iron (II) carbonate present in the ore.
i
(iv) the percentage of iron (II) carbonate in the
Dylan djeuka
October 8, 2020
Am not able to download pass questions here please need ur help
Elad Lovett
October 8, 2020
This is great an very helpful..
T- frank
October 9, 2020
am glad it is..thanks
Djamen
October 18, 2020
Very éducatif
Tobi
October 26, 2020
Any GCE group ?
Me
January 5, 2021
I am not able to download the application
Tracy Enow
April 23, 2022
Why can’t I find full GCE questions here? They always give just a part of the year I ask, what’s happening?
Tracy Enow
April 23, 2022
Why can’t I find full GCE questions here? They always give only a part of the year I ask, what’s happening?
Brayan
May 24, 2022
I am not able to download the app
Kennedy kenneth
June 7, 2022
Motivation