Question

What is the colour of ppt formed when sodium hydroxide is added to ferrous chloride salt solution ​

Answer 1

Answer: when small volume of sodium hydroxide (NaOH) is added to a test tube containing a small volume of ferrous chloride (FeCl2), a dirty green precipitate forms in the test tube. That green precipitate is actually ferrous hydroxide [Fe(OH)2]. Ferrous hydroxide will be forced out of the solution as a precipitate because it isn't soluble in water. If the mixture is filtered, the colourless filtrate you'll get is sodium chloride NaCl solution.

The equation for the reaction is:

2NaOH + FeCl2 →Fe(OH)2 (green p.p.t) + 2NaCl.

This is a precipitation reaction or double decomposition reaction.

Explanation:

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Answer 2

When sodium hydroxide is added to Iron (II) chloride, dirty green precipitate of Fe(OH)2 is formed.

Equation:

2NaOH + FeCl2 = Fe(OH)2 + 2NaCl