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Calculate the molarity of NaOH if 25.0 grams of NaOH is dissolved in 0.750 L of...

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spock8 | Student, Undergraduate | (Level 1) Honors

Posted April 23, 2013 at 4:04 PM via web

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Calculate the molarity of NaOH if 25.0 grams of NaOH is dissolved in 0.750 L of solution

 

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted April 23, 2013 at 4:15 PM (Answer #1)

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Molarity is the amount of moles of solute per volume of the solution. it can be expressed as:

`Molarity = (mol es of solute)/(Volume of the solution (L))`

Usually the unit is expressed in moles/L. 

Given:

25.0 grams NaOH 
0.750L solution

 

First, convert the given amount of NaOH from mass to moles and obtain the molarity by dividing it with the volume of the solution.

`25.0 grams NaOH * (1 mol e NaOH)/(39.9971 grams NaOH)`

`= 0.625 mol es NaOH`

 

Finally,

`Molarity = (0.625 mol es NaOH)/(0.750 L)`

Molarity = 0.833 Molar or M or moles/L

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