Asked • 06/14/19

How do you prepare 250 ml of 1M NaCl solution from a solid? NaCl has MW= 58.4 g/mole

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Jesse E. answered • 06/14/19

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For this problem, we will need to calculate the amount of grams of salt to add:

250 ml = 0.250 L


0.250 L * (1 mole/ 1 L NaCl) * (54.4 g/ mole NaCl) = 13.6 g NaCl.


You would add 13.6 g NaCl to 250 mL of water.

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J.R. S.

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Actual you should add sufficient water to 13.6 g of NaCl to make a final volume of 250 ml. Do not just add 13.6 g of NaCl to 250 ml as doing so will result in a volume greater than 250 ml.
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06/14/19

Jesse E.

Thank you for this observation. However, I was providing a simplified answer. I was assuming the student would follow lab protocol in making solutions. This would be adding the NaCl in a glass container, add 100 ml of water, stir the solution, and add the water up to 250 mL.
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06/15/19

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