Manganese chloride Stock Solution

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Stock Solution Preparation Guide – Manganese(II) Chloride (MnCl₂)

Manganese(II) chloride (MnCl₂) is an inorganic salt that exists in anhydrous, dihydrate, and tetrahydrate forms. The hydrated forms are pink and readily dissolve in water to give solutions of Mn²⁺ ions.

Commercial solutions such as 0.1 M MnCl₂ in water are available for laboratory use.

Objective

Preparation of 100 mL of 0.1 M Manganese(II) chloride stock solution.

Composition

• 0.1 M Manganese(II) chloride (MnCl₂) aqueous solution

Required Materials

• Manganese(II) chloride reagent (anhydrous or hydrated)
• Deionized / distilled water
• 100 mL volumetric flask or graduated cylinder
• Analytical balance
• Mixing tool (magnetic stirrer or stirring rod)
• Personal protective equipment (gloves, goggles, lab coat)

Procedure

Follow your laboratory’s safety protocols. Manganese compounds can irritate skin and mucous membranes; handle with appropriate PPE.

• Step 1
  Calculate the required mass of MnCl₂ solid: Mass = concentration × volume × molecular weight. For 0.1 M and 0.1 L using **anhydrous MnCl₂** (MW ≈ 125.84 g/mol):
  Mass ≈ 0.1 mol/L × 0.1 L × 125.84 g/mol = **1.26 g**.
• Step 2
  Accurately weigh ~1.26 g anhydrous MnCl₂. If using dihydrate (MnCl₂·2H₂O) or tetrahydrate (MnCl₂·4H₂O), adjust according to their respective molecular weights.
• Step 3
  Add the solid into ~80 mL deionized water and stir until fully dissolved.
• Step 4
  Transfer the solution to a 100 mL volumetric flask and bring to volume with deionized water. Mix thoroughly.

Storage: Label the stock solution with concentration and date. Store at room temperature or refrigerated according to your lab practices.

Available Reagents