Help me please.... Need to find a, b, the relative formula masss and x:
An ammonium iron alum has the formula
(NH4)a Fe(SO4)b . x H2O.
A 1.0 g sample of salt was dissolved in 100cm3 of water and divided into 2 portions
To 1 portion was added excess NaOH and then boiled. The NH3 eveolved exactly neutralized 10.4mL of 0.1M HCl.
To other portion, eexcess zinc was added to reduce Fe3+ to Fe2+. The mixture was filtered and the filterate required 20.8mL of 0.01M KMnO4 to oxidise the Fe2+ back to Fe3+/
Please help me... and I appreciate your full workings
... I will reward as best as I could...
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Singapore
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