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A mixture is made by combining 19.9 mL of 1.2×10−3 M KSCN, 8.5 mL of 8.1×10−2...

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Chemistry

A mixture is made by combining 19.9 mL of 1.2×10−3 M KSCN, 8.5mL of 8.1×10−2 M Fe(NO3)3, and 11 mL of 0.198 M HNO3. Calculate theconcentration of Fe3+ in the solution.

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4.2 Ratings (632 Votes)

Answer. given concentration of ferric nitrate is 8.1x10-2 M and volume is 8.5 ml.      

first finding the mass of ferric ions in the given concentration

.mass of Fe+3 ions m=(molarity*volume*molar mass)/1000

                                 m=(8.1x10-2*8.5*55.85) /1000

                           m=3.85x10-2 g/mol.

Now finding the concentration of ferric ions in the mixture.total volume of the mixture=8.5+11+19.9=39.4 ml.

molarity =(3.85x10-2 x1000)/(55.85x39.4)=38.5/2200.49=0.02M

concentration of Fe+3=0.02 M

             
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