Preparation of 4% Neutral Boric Acid Solution

Required Apparatus

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

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.