Taiwo Femi's Request (28 Feb 2018)

What is the concentration when 225ml of 0.3M KOH is added to 125ml of 0.55M KOH?
CHEM 1211

submitted: Feb 28, 2018
responded: Mar 01, 2018
  • method: email
2 Comments:
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  • Chi Luong ()
    March 1, 2018, 12:04 a.m.

    you can calculate mole of each solution basing on concentration formula n = MxV (exchange the unit to L) and sum them up, then divided by sum of volume (in L).

    Discussion:
    March 1, 2018, 12:14 a.m. - Taiwo Femi

    Thank you Chi

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  • Jay Dosunmu (admin)
    March 1, 2018, 12:10 a.m.

    Hey Taiwo, Since molarity is the number of moles of solute per liter of solution, a straightforward way to solve this problem would be to convert the given numbers into their ratio forms, e.g. .0675 mol / .225 L and 0.06875 mol / .125 L and then add the moles and liters together. You will get a new ratio in the form of: (mol1 + mol2)/(L1 + L2) which will give you your new molarity. I hope that helps, and let us know if you have any more questions :)

    Discussion:
    March 1, 2018, 12:14 a.m. - Taiwo Femi

    Thank you Jay :)

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