Show how to prepare 150 grams of solution which is 7.5% NaCl by weight concentration.
a. what weight of Solute is needed? (show computations)
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Answer:
The mass of NaCl needed for the solution is:
150g\times0.075=11.3g150g×0.075=11.3g
Therefore, the mass of water is 150g-11.3g=138.7g150g−11.3g=138.7g.
Assuming that the density of water is equal to 0.9982g/mL0.9982g/mL at 20oC, the volume of water needed is V=\frac{138.7g}{0.99982g/mL}=139mLV=
0.99982g/mL
138.7g
=139mL
So, in order to prepare this solution, 11.3 g of NaCl should be weighted and added to 139 mL of pure water.
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