Question

You need to make an aqueous solution of 0.144 M sodium phosphate for an experiment in lab, using a 300 mL volumetric flask. How much solid sodium phosphate should you add?

Answer 1

To make a 0.144 M sodium phosphate solution in a 300 mL volumetric flask, you would need to add 7.484 grams of solid sodium phosphate.

Step-by-step explanation:

To prepare a 0.144 M sodium phosphate solution in a 300 mL volumetric flask, you need to calculate the amount of solid sodium phosphate to add.

The formula for sodium phosphate is Na3PO4. To find the mass of sodium phosphate, you can use the formula:

Mass = Molarity x Volume x Molar Mass

Let's calculate the mass of sodium phosphate:

Mass = 0.144 M x 0.300 L x (3 Na + 1 P + 4 O)

Mass = 0.144 M x 0.300 L x (3 x 22.99 g/mol + 1 x 30.97 g/mol + 4 x 16.00 g/mol)

Mass = 0.144 M x 0.300 L x 163.92 g/mol

= 7.484 g

Therefore, you need to add 7.484 grams of solid sodium phosphate to the 300 mL volumetric flask to prepare a 0.144 M solution.