Preparation of 4% Neutral Boric Acid Solution

Boric Acid (H₂BO₃ ) is week inorganic acid. Use in Pharmaceutical and laboratory. 4% Boric Acid (H₂BO₃ ) solution commonly use in analytical purposes.

To Prepare 4% Boric Acid (H₂BO₃ ) solution Use Distilled Water.

4% Boric Acid (H₂BO₃ ) solution means 40grams of Boric Acid (H₂BO₃ ) dissolved in water to produce 1000mL of Solution.

Required Apparatus and Chemical

• One-liter beaker
• Stirring rod
• Hot plate or heat source
• Measuring cylinder (for 750 mL water, 10 mL bromocresol green, and 7 mL methyl red)
• One-liter reagent stoppered boqttle
• Pipette or dropper (for precise liquid measurements)
• Balance or scale (for measuring 40 gm boric acid)
• Distilled water container
• Boric Acid (H₂BO₃ )

Preparation of 4% Neutral Boric Acid

• Take 750 mL of hot neutral distilled water in a one-liter beaker.
• Add 40 gm of boric acid to the hot water all crystals are dissolved.
• Add 10 mL of Bromocresol Green Solution.
• Add 7 mL of methyl red solution to the Boric acid.
• Transfer to a one-liter reagent stoppered bottle.
• After cooling, make up to 1000 mL and shake well.
• The solution should be used only after a minimum one-day gap from the date of preparation.