To prepare 20.0 mL of a 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 20.0 mL of water.

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To prepare a 20.0 mL of a 2.00 M solution from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 16.0 mL of water to achieve a total volume of 20.0 mL, not add 20.0 mL of water to the 4.00 mL of stock solution.

To Prepare 20