Magnesium chloride hexahydrate for analysis. Lab Grade Magnesium Chloride 500 gram pack is available in Bangladesh. Magnesium chloride hexahydrate (MgCl₂·6H₂O) is often used in analytical chemistry for various applications.

Chemical Properties Magnesium chloride hexahydrate

• Chemical Formula: MgCl₂·6H₂O
• Molecular Weight: 203.3 g/mol
• Solubility: Highly soluble in water, with a solubility of about 54.3 g per 100 mL at room temperature.
• Melting Point: Decomposes at high temperatures (around 150 °C) rather than melting.

Physical Properties of (MgCl₂·6H₂O)

• Appearance: White, crystalline solid.
• Hygroscopic Nature: Absorbs moisture from the air, which can impact the concentration in solutions and should be accounted for in analyses.

Applications in Analytical Chemistry

1. Titration:
   • Complexometric Titration: Used for determining concentrations of metal ions (like calcium and magnesium) using chelating agents (e.g., EDTA).
   • Procedure: Sample solution is titrated with a standard solution of EDTA, using a suitable indicator (like Eriochrome Black T) to indicate endpoint.
2. Preparation of Buffer Solutions:
   • Magnesium chloride can help maintain pH in biological and chemical reactions.
3. Reagent:
   • Acts as a source of magnesium ions in biochemical reactions, especially in enzyme assays and mineral studies.
4. In Synthesis:
   • Used in the preparation of other magnesium compounds and as a catalyst in some reactions.

Analytical Techniques

1. Gravimetric Analysis:
   • Procedure: Precipitation of magnesium ions as magnesium ammonium phosphate (MAP) or magnesium hydroxide can allow quantification by mass.
   • Advantage: High accuracy and precision for determining magnesium content.
2. Spectrophotometry:
   • Complex Formation: Magnesium ions can form colored complexes with certain ligands, allowing for UV-Vis spectrophotometric determination.
   • Method: Measure the absorbance at specific wavelengths related to the complex formed.
3. Ion Chromatography:
   • Useful for separating magnesium ions from other cations and anions in a mixture.
   • Mobile Phase: Usually involves a buffered solution to maintain pH.
4. Atomic Absorption Spectroscopy (AAS):
   • Suitable for measuring low concentrations of magnesium in various samples (like water, biological samples, etc.).
   • Sample Preparation: Often requires dilution or specific matrix modification for accurate measurement.

Safety and Handling

• Personal Protective Equipment (PPE): Use gloves, safety goggles, and lab coats to avoid skin and eye irritation.
• Storage: Keep in a tightly sealed container in a cool, dry place to minimize moisture absorption.
• Disposal: Follow local regulations for chemical disposal, as magnesium chloride can contribute to environmental salinity if not disposed of properly.