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Chemistry

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How many milliliters (ml) of 5 M MgCl2 must be added to 25 ml of a 0.5 M MgCl2 solution
to produce 1500 ml with a final MgCl2 concentration = 1.75 M? How much water?

  • Chemistry - ,

    Let's see how much MgCl2 we need in the final solution:

    1500 mL of 1.75 M solution contains
    1.5 * 1.75 = 2.625 moles of solute

    25 mL of 0.5M solution contains
    .025 * 0.5 = .0125 moles of solute

    So, we need to add 2.6125 moles of solute.
    That means we need 2.6125/5 = .5225 L of 5M solution (522.5 mL)

    So, now we have .025+.5225 = .5475L of solution. We want 1.5L, so we have to add

    1.500-.5475 = .9525L or 952.5 mL of water

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