You Wish To Prepare 50 \\ G na to kg Google Searc x ing com/ibiscms/mod/ibis/vie

Question

You Wish To Prepare 50 G na to kg Google Searc x ing com/ibiscms/mod/ibis/view.php?id-5397221 Jump to.. State University, San Bernardino-CHEM 345 Spring18-NOBLET Activities and Due Dates Chib Resor Not Set 11.6/100 Print Caluator Perodic Table Question 3 of 16 ca Sapling Learning Map Pc You wish to prepare 500.0 mL of a 650.0 ppm wv sodium (MW-22.9897 gmol) solution. How many grams of sodium dichromate dihydrate (Na CrO 2H-O, MW-297.998 g/mol) are needed to prepare this solution? Assume the final solution has a density of 1.00 g/mL Pc Oe about us| careers privacy olicy terns of use contact us helo

Explanation / Answer

ppm is considered to be the same as mg/L.

Here we need 500.0 mL of solution which contains 650.0 mg/L Na

So, 650.0 mg/L Na x 0.500 L = 325 mg Na

Now ,

325 mg Na x (molar mass Na2Cr2O7 . 2H2O) / molar mass Na2)

= 325 mg Na x 297.998 / 2 x 22.9897

= 96849.35 /45.9794 mg

= 2106.36 mg

= 2.1 g

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