If you add 4.00 mL of pure water to 6.00 mL of 0.750 M NaCl solution,what is the concentration of sodium chloride in the diluted solution?
A)0.250 M
B)0.450 M
C)0.500 M
D)1.13 M
E)none of the above

Question

Quizplus · Accepted Answer

Before dilution:
moles of NaCl = (6.00 mL) x (0.750 mol/L) = 4.5 mmol
After dilution:
total volume = 4.00 mL + 6.00 mL = 10.00 mL
moles of NaCl = 4.5 mmol
concentration = moles / volume = 4.5 mmol / 10.00 mL = 0.450 M

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