![9) {4 pts) A solution is formed by dissolving 20.26 grams of solid NaOH in 1.265 liters of water. What is the [OH] of this so](http://img.homeworklib.com/questions/7977c5c0-a198-11ea-b84e-0b4be7a483d5.png?x-oss-process=image/resize,w_560)
Homework Answers
Q9. Given : mass NaOH = 20.26 g
moles NaOH = (mass NaOH) / (molar mass NaOH)
moles NaOH = (20.26 g) / (39.9969 g/mol)
moles NaOH = 0.5065 mol
concentration NaOH = (moles NaOH) / (volume of solution in Liter)
concentration NaOH = (0.5065 mol) / (1.265 L)
concentration NaOH = 0.4004 M
NaOH is a very strong base which completely dissociates into Na+ and OH- ions.
concentration of OH- = concentration NaOH
[OH-] = [NaOH]
[OH-] = 0.4004 M
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