Group VI Cation Analysis Simulator

Group VI Cations Analysis

Specific Confirmatory Test for Magnesium (Mg²⁺).

1. Setup Experiment

Select Unknown Filtrate

Magnesium (Mg²⁺) Solution Sodium (Na⁺) Solution [Control]

0

1

2

2. Observation

Physical State Clear Solution

Status: Standby.
Assume the filtrate after Group V. Magnesium does not have a general group reagent and remains in solution. Step 1 is to ensure the medium is ammoniacal.

3. Chemical Principles

1. Precipitation Reaction: Disodium hydrogen phosphate (Na₂HPO₄) is added to the ammoniacal solution of Magnesium salts. This yields a white crystalline precipitate of Magnesium Ammonium Phosphate.

Mg²⁺ + NH₄⁺ + PO₄³⁻ → MgNH₄PO₄↓

2. Nucleation Technique: This precipitate has a strong tendency to form supersaturated solutions. Scratching the inner walls of the test tube with a glass rod creates microscopic glass fragments and surface defects that act as nucleation sites, forcing crystallization to occur.

Visual Key

Aqueous Solution

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