Home >> Science & Nature >> Science

How to Make One Molar Phosphoric Acid Out of Stock

Phosphoric acid is an inorganic compound with the chemical formula H3PO4. This compound is commonly used in the laboratory work to make buffer solutions. Molarity denoted as "M" is the way to express the concentration of a substance in the solution; for example, 1 molar concentration indicates that each liter of the solution contains 1 mole of phosphoric acid. A stock is the concentrated solution of the compound. The stock allows you to quickly prepare any required solution by a simple dilution.

Things You'll Need

Calculator
Graduated cylinder
Beaker
Glass rod

Instructions

- 1
  Divide the volume of the phosphoric acid solution you need to make by the concentration of the stock solution to determine the volume of the stock solution. For example, to make 250 ml of 1 M of the solution using 5 M of stock you n=have to take 250 / 5 = 50 ml of the stock solution.
- 2
  Pour the phosphoric acid stock solution of into a graduated cylinder to measure exactly 50 ml, as calculated in this example.
- 3
  Pour the solution from the graduated cylinder to the beaker.
- 4
  Add distilled water to the beaker to get the final volume of 250 ml.
- 5
  Mix the solution in the beaker for 15 to 20 seconds with a glass rod.

Science