What changes mix of iron filings+ sulphur to add hcl colourhcl?
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green or brown on colour
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If you heat iron filings ans sulphur to a sufficiently high temperature you form iron sulphide
Fe + S → FeS
If you add HCl to this the following reaction occurs:
FeS + 2HCl → FeCl2 + H2S
H2S gas is given off and iron chloride is produced,
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