1 Answer

Neda Homa · Answer 1 · 2020-10-28T11:31:26+0000

Answer : The mass of potassium phosphate needed will be 3.98 grams.

Explanation : Given,

Molarity of potassium phosphate = 0.75 M = 0.75 mole/L

Molar mass of potassium phosphate = 212.27 g/mole

Volume of solution = 25.0 mL = 0.025 L (conversion used : 1 L = 1000 mL)

Molarity : It is defined as the number of moles of solute present in one liter of solution.

In this problem solute is, potassium phosphate.

Formula used :

$\text{Molarity}=\frac{\text{Mass of solute}}{\text{Molar mass of solute}* \text{volume of solution in liter}}$

Now put all the given values in this formula, we get:

$0.75mol/L=\frac{\text{Mass of solute}}{212.27g/mole* 0.025L}$

$\text{Mass of solute}=3.98g$

Therefore, the mass of potassium phosphate needed will be 3.98 grams.

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