Determining the Molarity of Phosphoric Acid

How can you determine the molarity of the phosphoric acid?

What is the process to find out the molarity of the phosphoric acid in this titration experiment?

Answer:

The molarity of phosphoric acid can be determined by conducting a titration with a known molarity of calcium hydroxide and using the formula M1V1 = M2V2 to calculate the unknown molarity of the acid.

When determining the molarity of phosphoric acid using a titration with 0.35M calcium hydroxide, you need to follow a specific process. This involves measuring the volume of calcium hydroxide needed to neutralize a known volume of phosphoric acid, and then using the titration formula to calculate the molarity of the acid.

The titration formula used is M1V1 = M2V2, where M1 is the molarity of the acid (unknown), V1 is the volume of the acid, M2 is the molarity of the base (0.35M calcium hydroxide), and V2 is the volume of the base used to reach the equivalence point.

For example, if you find that 20.00 mL of the 0.35M calcium hydroxide solution is needed to neutralize 15.00 mL of phosphoric acid, you can calculate the molarity of the acid as follows:

M1 = (M2 × V2) / V1

M1 = (0.35M × 20.00 mL) / 15.00 mL

M1 = 0.46M

Therefore, the molarity of the phosphoric acid in this case would be 0.46M.