What NaClNaCl concentration results when 259 mL259 mL of a 0.850 M0.850 M NaClNaCl solution is mixed with 567 mL567 mL of a 0.240 M0.240 M NaClNaCl solution?

0.431M

Explanation:

To find the concentration of NaCl we need to know how many moles comes from each solution. Then, we need to sum the total volume in liters and, as molarity (Unit of concentration) is the ratio between moles and volume we can determine concentration.

Moles from first solution:

259mL = 0.259L * (0.850mol / L) = 0.22015 moles of NaCl

Moles from second solution:

567mL = 0.567L * (0.240mol / L) = 0.13608 moles of NaCl

Total moles:

0.22015 + 0.13608 = 0.35623 moles of NaCl

Total volume:

259mL + 567mL = 826mL = 0.826L

Thus, molarity of the mixture is:

0.3562 moles NaCl / 0.826

0.431M

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