Adding Concentrations: Solving Homework Problem

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The discussion revolves around solving a homework problem involving concentrations using the formula (C1V1 + C2V2) / (V1 + V2). The user consistently arrives at a concentration of 0.0761 M and seeks confirmation on the accuracy of their calculations. They note the importance of converting mL to L and mention the stoichiometry of sodium sulfate, highlighting that one formula unit contains two sodium ions. The clarification about the formula unit helped resolve their confusion. The user expresses gratitude for the assistance received.
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Homework Statement




http://carlodm.com/images/1.png

Homework Equations



I tried using the formula: ( C1V1 + C2V2 ) / (V1 + V2)

The Attempt at a Solution



I keep on getting .0761 M. anything wrong with this? (YES I changed mL to L)
 
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The expression for the resulting formula looks good. Be aware that one formula unit of Na2SO4 , sodium sulfate, has two formula units of Na for each unit of compound.
 
THANK YOU!

That solved my problem!
 

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