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26 October, 19:54

more Chem.

Calculate the amount of solute needed to prepare the following solutions:

a. 50.0mL of a 5.0% (m/v) KCl solution

b. 1250 mL of a 4.0% (m/v) NH4Cl solution ... ?

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  1. 26 October, 20:22
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    The given percentage is that of the solute, so we subtract it from 100% to get the percentage of solvent.

    a) 50 x 0.95

    = 47.5 ml of solvent

    b) 1250 x 0.96

    = 1200 ml of solvent.
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