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Standard Solution - Molarity. PLEASE HELP?

Standard Solution - Molarity. PLEASE HELP? - Chemistry Forum

Standard Solution - Molarity. PLEASE HELP? - Chemistry Forum. Discuss chemical reactions, chemistry.


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Old 06-24-2009, 04:16 PM
Pipette Filler
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Default Standard Solution - Molarity. PLEASE HELP?



A standard solution of potassium dichromate, K2Cr2O7 (MM=294.2/mole) is prepared for dilution.First a stock solution of potassium dicromate is prepared by dissolving 25.00 grams in a total volume of 500.0mL. Second a 5.000mL portion of this stock solution is placed in a flask and diluted to a final volume of 100.0mL. Calculate the molarity of the final solution.
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Old 06-24-2009, 04:16 PM
Pipette Filler
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25 gm/294.2 gm/mol = 0.085 moles/0.5L = 0.17 M
5 ml diluted to 100 ml is a 20 fold dilution (100/5 =20)
0.17M/20 = 0.0085 M
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