Sodium carbonate Stock Solution

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Stock Solution Preparation Guide – Sodium Carbonate (Na₂CO₃) Solution

Sodium carbonate (Na₂CO₃), also known as soda ash or washing soda, is a white, water‑soluble inorganic compound with strong alkaline properties. In laboratory applications, sodium carbonate solutions are commonly used for pH adjustment, buffering alkaline media, titration analysis, and neutralization of acids. A 1 M stock solution provides a convenient reference for dilution and analytical work.

Objective

Preparation of a 1 M sodium carbonate stock solution.

Composition

• Sodium carbonate (Na₂CO₃) aqueous solution of defined molarity

Required Materials

• Sodium carbonate solid (anhydrous or hydrated as appropriate)
• Deionized or distilled water
• Analytical balance
• Beaker or flask
• Volumetric flask or graduated cylinder
• Stirring rod or magnetic stirrer
• Personal protective equipment (gloves, goggles, lab coat)

Procedure

• Step 1
  Determine the target concentration. For a 1 M solution: weigh **≈105.99 g** anhydrous sodium carbonate (or adjusted amount for hydrate) for 1 L. Scale proportionally for other volumes.
• Step 2
  Add the weighed solid to a beaker containing ~80 % of the final volume of deionized water. Stir until fully dissolved.
• Step 3
  Transfer the solution to a volumetric flask. Rinse the beaker to ensure all solute is transferred. Add deionized water to reach the final volume and mix thoroughly.
• Step 4 (Optional)
  Filter through a 0.22 µm membrane if a sterile solution is required. Heat sterilization is generally unnecessary.

Note: Hydrated salts are preferred for accurate weighing; anhydrous sodium carbonate may absorb moisture and reduce accuracy. Label the container clearly with concentration and preparation date, and store in a sealed container at room temperature.

Available Reagents