cameroon gce advanced level 2015 chemistry 2

cameroon gce advanced level 2015 chemistry 2

cameroon gce advanced level 2015 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 cmof solution
(iii) the mass of iron (II) carbonate present in the ore.
i
(iv) the percentage of iron (II) carbonate in the

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