How do I make oxalic acid water soluble?

Oxalic acid is naturally soluble in water, with a solubility of about 143 grams per liter at 25°C3. However, its solubility can be improved under certain conditions:

1. Temperature: Oxalic acid is more soluble in warmer water. Increasing the temperature can help dissolve more oxalic acid in water15.

2. Additives: Some users find that adding a small amount of phosphoric acid can help improve the solubility of oxalic acid in water, making it easier to maintain a stable solution2.

3. Stirring and Heating: Mixing the solution thoroughly and heating it slightly can also aid in dissolving oxalic acid4.

Here's a basic method to prepare an oxalic acid solution:

Preparing an Oxalic Acid Solution

1. Materials Needed:

   • Oxalic acid (dihydrate form)
   • Water
   • Optional: Phosphoric acid (small amount)

2. Instructions:

   • Step 1: Measure out the desired amount of oxalic acid. For example, to make a 3.2% solution, use about 3.4 ounces (approximately 96 grams) of oxalic acid per gallon of water2.
   • Step 2: Add the oxalic acid to warm water. Stir well to dissolve.
   • Step 3 (Optional): If the oxalic acid does not fully dissolve, add a small amount of phosphoric acid to aid in solubilization.
   • Step 4: Continue stirring until the solution is clear.

Safety Note: Always handle oxalic acid with care, as it can be irritating to skin and dangerous if ingested in large quantities5. Wear protective gloves and work in a well-ventilated area.