For alcohol in water solution how many ml of 15% solution be mixed with a 35% solution to get 250 ml of 21% solution.
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Calculate the number of moles of solute present.
Moles of NaOH = 15.0 g NaOH × 1mol NaOH40.00g NaOH = 0.375 mol NaOH
Calculate the number of litres of solution present.
Volume = 225 mL × 1L1000mL = 0.225 L soln
Divide the number of moles of solute by the number of litres of solution.
Molarity = 0.375mol0.225L= 1.67 mol/L
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