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Posted by on Monday, October 1, 2012 at 6:20pm.

Calculate the mass of solid Na2S2O3•5H2O required to prepare 300. mL of 0.0200 M Na2S2O3

  • chemistry - , Monday, October 1, 2012 at 6:29pm

    .3L of .02M solution contains .006 moles of solute.

    So, take .006 * mol wt of solute to get the mass

  • chemistry - , Monday, October 1, 2012 at 6:39pm

    ok.. that's what I had done before..

    Na2s203 has a mass of 158.11g

    so I get for 0.006 mol of Na2s203 = 0.9486 g or with 3 significant figures = 9.48 mg.

    but this still comes up as wrong when I put it into my online portal for my lab.

  • chemistry - , Monday, October 1, 2012 at 7:20pm

    The problem asks for mass Na2S2O3.5H2O. You calculated mass Na2S2O3. Add the 5 mols H2O to find the mass of the hydrated salt.

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