Q.

Which of the following aqueous solutions has the highest concentration of Na+?

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answer is 3.

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Detailed Solution

(a) Na2SO4=2Na++SO42-∴[Na+]=0.208×2=0.416M(b) 2.07g NaCl/100mL=20.7 g NaCl/L=20.758.5=mol L-1                                                      = 0.353 M∴[Na+]=0.353M(c) 15.4 mg Na+=15.4×10-3g Na+ mL-1=15.4 g Na+L-1=15.423mol Na+L-1∴[Na+]=15.423=0.669MThus, (c) has the highest molar concentration of Na+
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