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If I dissolve $\pu{0.1 M}$ of $\ce{CaCl2.2H2O}$ in water, do I get a $\pu{0.1 M}$ $\ce{CaCl2}$ solution?

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    $\begingroup$ @Pastudent - you don't neglect the water of hydration. You should dissolve 0.1 moles of the hydrate in say 750 ml of water and then add water in a volumetric flask to get "exactly" 1.000 liter of solution total. $\endgroup$ – MaxW Feb 7 at 14:06
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First, try to be clear. Nobody can dissolve 0.1 M of anything in water. 0.1 M is not an amount. It is a concentration. I think you should replace "M" by "mole".

Second, you must mention the amount of water used to dissolve your product, or the final volume. I think you should rewrite your demand in such a way : "If I dissolve 0.1 mole CaCl2·2H2O in enough water to get a final volume of one liter, do I get a 0.1 M CaCl2 solution?"

And here the answer would be "Yes !"

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  • $\begingroup$ Kudos for pointing out the flaw in how the units were specified in the problem statement. Newbies need that sort of clarification to understand how all the terminology fits together. $\endgroup$ – MaxW Feb 7 at 14:48
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    $\begingroup$ At least the title was correct. $\endgroup$ – M. Farooq Feb 7 at 15:20
  • $\begingroup$ NO ! The title is not correct !! It is impossible to dissolve 0.1 M of anything in water, without specifying the volume of water. The title and the question are exactly the same series of words !! $\endgroup$ – Maurice Feb 8 at 13:43

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