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15.7g naoh is dissolved in water. the final volume of the solution is 750ml. find the ph of the solution.

Sagot :

Answer:

pH is 0.30

Explanation:

Given:
m=15.7 g NaOH
V=750ml⇒0.75 L

Required:
pH

Solution:
First solve for the Molarity which is moles of solute divided by the liters of solution

~moles of NaOH~
given mass of solutes × molar mass of solute=moles of solute
15.7g NaOH × [tex]\frac{1 mol NaOH}{40g NaOH}[/tex]= 0.4mol NaOH

Molarity =[tex]\frac{moles of solute}{liters of solution}[/tex] =[tex]\frac{0.4mol}{.75L}[/tex]= 0.5

pH= -log[[tex]H_{3} O^{+}[/tex]]
ph= -log[0.5]
pH=0.30