Question

if dilute sulphuric acid is added to a test tube containing piece of iron sulphide and a paper strip dipped in lead acetate solution was bought over the mouth of the test tube write the reaction taking place

Answer 1

Answer:

The following chemical equations are not balanced:

$H_{2}SO_{4} + FeS$ ⇒ $FeSO_{4} + H_{2}S$

$Pb(C_{2}H_{3}O_{2})_2 + H_{2}S$ ⇒ $PbS + CH_{3}COOH$

Explanation:

Under acidic conditions, the Ferrous sulphide will form the respective Iron salt and Hydrogen Sulphide which is a gas at STP. Now, if we take a Lead Acetate-treated paper and put it at the mouth of the test tube, the Lead Acetate and Hydrogen Sulphide will react to Lead Sulphide and Acetic acid. As the Lead Acetate solution is colourless and the formed Lead Sulphide is black, we can conclude that Hydrogen Sulphide is being produced.