Problem: What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 5.05 L of an NaOH solution with a pH of 10.6?

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We are being asked to what volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 5.05 L of a NaOH solution with a pH of 10.6.


For NaOH:

Any Group 1A metal when combined with OH-, H-, O2- or NH2- makes a strong base
Na (Group 1A metal) is paired with OH-
NaOH → strong base


Since NaOH is a strong base, it will completely dissociate in the solution:

NaOH(aq) → Na+(aq) +  OH-(aq)

Since the pH of the solution is given. We need to compute for pOH to calculate for the concentration of [OH-]. 

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What volume of a 15.0% by mass NaOH solution, which has a density of 1.116 g/mL, should be used to make 5.05 L of an NaOH solution with a pH of 10.6?