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Preparation of a standard solution question: Please help me!! watch

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    Q: Why is a standard solution NOT made by dissolving a known mass of primary standard substance in a known volume of solvent?

    Problem: I swear that IS how you make a standard solution?! E.g. Dissolving a known mass of sodium carbonate into a known volume of distilled water gives you a standard solution, no? Please can someone explain to me where I'm wrong, no books or websites have the answer :'(
 
 
 
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Updated: November 12, 2015
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