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Sagot :
Answer: The molarity of solution is 0.08 M
Explanation:
pH is the negative logarithm of hydrogen ion concentration. It tells abpout the acidity or basicity of a solution.
[tex]pH=-log[H^+][/tex]
also pH+pOH=14
given : pH of NaOH = 12.9
Thus pOH = (14-12.9) = 1.1
Thus [tex][OH^-]=10^{-1.1}=0.08M[/tex]
As [tex]NaOH\rightarrow Na^++OH^-[/tex]
As 1 mole of [tex]OH^-[/tex] is produced by = 1 mole of NaOH
Thus 0.08 moles of [tex]OH^-[/tex] are produced by = [tex]\frac{1}{1}\times 0.08=0.08[/tex] moles of NaOH
The molarity of solution is 0.08 M
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