Help with a problem!

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Tara 1F
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Joined: Fri Jun 23, 2017 11:39 am

Help with a problem!

Postby Tara 1F » Mon Jul 03, 2017 4:13 pm

Question: 5.00g of KMno4 is dissolved in a 150mL flask of water. If 20ml of this solution is removed and placed in a new 2nd 250ml flask and filled with water what is the concentration of the solution in the 2nd flask? Molar masses: K(39.10g/mol) Mn(54.94g/mol) and O(16.00g/mol)
Can someone explain the steps of this problem

Chem_Mod
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Re: Help with a problem!

Postby Chem_Mod » Wed Jul 05, 2017 10:25 am

1. Find the concentration of the first solution: convert grams of KMnO4 to moles (using molar mass; add up the molar mass of each atom) and divide by first volume
2. Find the moles transferred to the second flask: multiply the concentration of the first solution by the transferred volume
3. Find the concentration of the second solution: Divide the moles transferred by the second volume


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