Sulfide Confirmatory Test Simulator

Sodium Nitroprusside Test

Confirmatory Test for Sulfide (S²⁻) Ions in Qualitative Analysis.

1. Setup Experiment

Select Unknown Alkaline Extract

Sodium Sulfide (S²⁻) Extract Sodium Sulfate (SO₄²⁻) Extract [Control]

2. Observation

Solution Color Clear

Status: Standby.
Select an alkaline water extract of a salt. The addition of Sodium Nitroprusside solution will detect the presence of soluble sulfide ions.

3. Chemical Principles

Coordination Chemistry: Sodium nitroprusside is a coordination complex: Na₂[Fe(CN)₅NO].

When a highly nucleophilic sulfide ion (S²⁻) is present in an alkaline medium, it attacks the nitrosyl (NO) ligand, forming a deeply colored thionitroprusside complex.

S²⁻ + [Fe(CN)₅NO]²⁻ → [Fe(CN)₅NOS]⁴⁻

Visual Key

Alkaline Salt Extract

Nitroprusside Reagent

Thionitroprusside (Violet)

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