Question

a. Why do aluminum and chromium precipitate as hydroxides rather than as sulfides in Group III?...

a. Why do aluminum and chromium precipitate as hydroxides rather than as sulfides in Group III?

b. Why does tripositive iron precipitate as iron(II) sulfide rather than iron(III) sulfide in an ammonium sulfide solution?

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Answer #1

b. the net ionic equation of reaction between iron(III) and ammonium sulfide is

2Fe+3(aq) + 2S-2 (aq) = Fe2S3 (s) it is realtively unstable compound and do not occur in natute , Fe2s3 decomposes at 20 oC into iron sulfide (FeS) and sulfur.

Fe2S3= 2FeS + S. Fe(ii)sulfide is more stable compound than Fe(III)sulfide.

a. third analytical group of cations includes chromium and aluminium, these tend to form hydroxides which are insoluble even at low concentrations.

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