An aliquot (20 mL) of a Na 2 SO 4 stock solution is made up to 200 mL with water. The final concentration of Na 2 SO 4 in the diluted solution is 50 mM. What was the concentration of Na 2 SO 4 in the stock solution?

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An aliquot (20 mL) of a Na 2 SO 4 stock solution is made up to 200 mL with wate...

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An aliquot (20 mL) of a Na₂SO₄stock solution is made up to 200 mL with water. The final concentration of Na₂SO₄in the diluted solution is 50 mM. What was the concentration of Na₂SO₄in the stock solution?

55 mM

0.50 mM

500 mM

100%

550 mM

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