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Calculate the molarity of NaOH if 25.0 mL of a 0.250 M solution of NaOh is diluted to...

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spock7 | Student, Undergraduate | (Level 1) Honors

Posted April 23, 2013 at 4:01 PM via web

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Calculate the molarity of NaOH if 25.0 mL of a 0.250 M solution of NaOh is diluted to 100.0 mL

 

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jerichorayel | College Teacher | (Level 1) Senior Educator

Posted April 23, 2013 at 4:24 PM (Answer #1)

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Dilution is the process of reducing the concentration of chemical species of a specific solution. Generally, solvent in added in the system to increase the volume thus decreasing the concentration. 

The general equation for dilution can be expressed as:

`M_1V_1 = M_2V_2`

where:

`M_1 = 0.250`

`V_1 = 25.0 mL = 0.025 L`

`M_2 = ?`

`V_2 = 100 mL = 0.1 L`

 

Then we solve for M2:

`M_1V_1 = M_2V_2`

`(0.250)*(0.025) = M_2*(0.1)`

`M_2 = ((0.250)*(0.025))/(0.1)`

`M_2 ` = 0.625 M


Note: 1000mL = 1L

 

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