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You took 2 mL of a stock solution of sodium phosphate (60 mM) and mixed it wit...
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You took 2 mL of a stock solution of sodium phosphate (60 mM) and mixed it with 8 mL of water to make solution A.
You then took 1 mL of a solution A and mixed it with 3 mL of water to make solution B.
You then took 2 mL of a solution B and mixed it with 2 mL of water to make solution C.
Calculate the concentration (in mM) of sodium phosphate in each of these solutions.