A $5g$ mass of sodium chloride, and an $8.2g$ mass of sodium sulfate are dissolved in a $200*mL$ of aqueous solution. What is $[Na^+]$ ?

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Answer 1 · 2017-09-18T08:50:07

Well I make $[Na^+]=1.00*mol*L^-1$

$"Moles of NaCl"=(5.0*g)/(58.44*g*mol^-1)=0.0856*mol$ .

$"Moles of"$ $Na_2SO_4=(8.2*g)/(142.04*g*mol^-1)=0.0577*mol$ .

And thus $[Na^+]=(0.0856*mol+2xx0.0577*mol)/(200*mLxx10^-3*L*mL^-1)$

$=??*mol*L^-1$ .

Why did I double the molar quantity with respect to $Na_2SO_4$ . Did I make a mistake?

A 5*g5*g mass of sodium chloride, and an 8.2*g8.2*g mass of sodium sulfate are dissolved in a 200*mL200*mL of aqueous solution. What is [Na^+][Na^+]?