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a) First convert the given mass of NaOH to volume (in mL) using the density of NaOH which is 2.13 g/mL. Volume of solute (NaOH) = 34 g * (1 mL/2.13 g) = 15.96 mL Volume % = (volume of solute / volume of solution) * 100% Volume % = (15.96 mL/120 mL) * 100% = 13.3 % (answer)b. Volume % = volume of NaOH/ total volume

volume % = 10 % = 10/100 = 0.10 0.10 = 15.96 mL/total volume Solving for total volume yields: V_total = 15.96 /0.10 = 159.6 mL So, about 159.6 mL of a 10% solution can be made from the solution in part a.

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