joey asked in Science & MathematicsChemistry · 1 decade ago

Dilution (another question )?

calculate the final concentration if 2.00 L of 3.00 NaCl, 4.00 L of 1.50 NaCl and 4.00L of water are mixed. assume there is no volume contraction upon mixing

do you have to do it this way? >>

(2.00 x 4.00 + 3.00 x 1.50)/ 10 = 8.45

?

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  • 1 decade ago
    Favorite Answer

    You got the numbers mixed up.

    (MmL of solution 1 + MmL solution 2) / (vol soln 1 + vol soln 2 + vol H2O)

    Source(s): medical technology student
  • 1 decade ago

    2.00 L x (3 mol/L) = 6 mol NaCl

    4.00 L x (1.5 mol/L) = 6 mol NaCl

    Total moles = 6 + 6 = 12 mol

    Total volume = 2 + 4 + 4 = 10 liters

    Molarity = (12 mol/10 L) = 1.2 M

  • Anonymous
    1 decade ago

    3.00 Molarity (M) of NaCl and 1.50 M NaCl? Then it's:

    (2.00L x 3.00M + 4.00L x 1.50M)/10

    Volume x Concentration = amount (# moles)

    Sum individual amounts for total amount added

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