Carefully add 300 mL concentrated H₂SO₄ solution to 600 mL water. When solution is cool fill to 1L with DI water

Dissolve 40 g NaOH in 600 mL DI water with constant stirring. After solution is cool dilute to 1L with DI water

Add about 300 mL of DI water to a 500 mL volumetric flask and add 70 mL concentrated H₂SO₄. Mix well. When the temperature of the mixture is back to room temperature, dilute to 500 mL with DI water.

Dissolve 1.3715 g potassium antimonyl tartrate, K(SbO)C₄H₄O₆·½H₂O, in DI water and dilute to 500 mL. Store in a glass stoppered bottle. The solution is good for six months. Note: This compound is also known as antimony potassium tartrate, C₈H₄K₂O₁₂Sb₂·3H₂O.

Dissolve 20 g ammonium molybdate, (NH₄)₆Mo₇O_24· 4H₂O, in DI water and dilute to 500 mL. Store in a glass stoppered bottle.

Dissolve 0.2195 g potassium dihydrogen phosphate (KH₂PO₄), dried at 105°C, in water and dilute to 1L. (Preserve with 2 drops of chloroform--maybe not.) Good for 3 months. Store in a fridge.

Dilute 50 mL stock phosphate solution to 1L w/ DI water. Solution good for a week. Store in a fridge.

Obtain potassium dihydrogen phosphate (KH₂PO₄), from another source than was used for preparation of the stock solution. Dissolve 0.1098 g in about 500 mL of DI water in a 1L volumetric flask. Dilute to 1L with DI water, mix well and store in a fridge.

Stable only for about one week. Dissolve 1.76 g ascorbic acid in 100 mL distilled water.

This is only good for about four hours. Make fresh as needed. Use solutions at room temperarature. Add ingredients in the order listed and swirl to mix after adding each ingredient. Combine: