(b) An unknown volume of 3.50 M potassium phosphate, K, PO, solution is added to 0.210 L of water to form a 0.700 M K3PO, solution. Calculate the molarity of potassium ions, K in the solution.

Explanation:

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In this case, since we know the initial and final concentrations and the added volume of water, we can write:

Which can be solved for the initial volume as follows:

It means that the final volume is:

Next, we compute the moles of potassium phosphate in solution:

Then, since 1 mol of potassium phosphate has 3 moles of potassium (K's subscript), we compute the moles of potassium ions:

Finally, the concentration of potassium ions turns out:

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