The concentration of fe2+ in a solution is determined by titrating it with a 0.1956 m permanganate solution. the balanced net ionic equation for the reaction is: mno4-(aq) + 5fe2+(aq) + 8h3o+(aq) mn2+(aq) + 5fe3+(aq) + 12h2o(l) in one experiment, 20.81 ml of the 0.1956-m permanganate solution is required to react completely with 40.00 ml of the fe2+ solution. calculate the concentration of the fe2+ solution.

The concentration of the Fe2+ solution is 0,508 M

Explanation:

MnO4-(aq) + 5Fe2+(aq) + 8H3O+(aq) → Mn2+(aq) + 5Fe3+(aq) + 12H2O(l)

My concentration of permanganate is 0,1956 M (moles of solute in 1L of solution) but I use, just 20,81 ml so I need to get those moles.

1000 mL ___ 0,1956 moles

20,81 mL ___ (20,81 . 0,1956) /1000 = 4,07x10*-3 moles

The ionic equation says that 1 mol of MnO4- reacts with 5 moles of Fe2+ so my 4,07x10*-3 moles are going to react wih (4,07x10*-3 . 5) = 0,020moles of Fe2+

This quantity of moles are in the solution required, in the volume i was given (40mL). To get the concentration I have to calculate the moles in 1L (MOLARITY)

40mL ___ 0,020 moles of Fe2+

1000 mL ___ (1000 . 0,020) /40 = 0,508 M

it would be d. henry moseley

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for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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