Assume we start with 0.025M NaOH. 100mL of this 0.025M NaOH is poured into 0.5g Ca(OH)2, and this will eventually form a saturated solution.
Then, a 25mL aliquot of this solution is taken. What is the concentration of NaOH now?
Attempt:
0.025mol/L * (0.1L) = 0.0025mol of NaOH in total
Then when you take 25mL from this 100mL part of it, we get:
0.0025mol / 0.025L = 0.1M NaOH
So, when you take 25mL portion of this solution, we have concentration of 0.1M NaOH now...?

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Sorry, I meant the concentration of OH- coming from NaOH

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