What is the end point colour of Potaasium Permanganate when reacted with FeSo4?

Question

When you titrate the two reactants together and the end point is almost reached, the yellow/green solution will turn darker each time you drop KMnO4 into the flask. So, what is the colour of the end point of KMnO4? The first drop when the colour changes distinctively is a bit of like orange and pink and the second drop is darker in colour nearer to pink. So, what's the actual end point? The first or the second drop?

Answer 1

Actually the best estimate of your endpoint is between the first and the second drop. Is it pink or pinkish? It may sound a bit trifle, but at pink, you definitely have an excess of permangate already and you are past the end point. The faintest pinkish color is what you are really shooting for. The orange means you still have unreacted Fe+2.

But just like any volumetric analyses, there are inherent determinate errors. All you can do (or hope for) is minimize the errors. One immediate solution is to average the values from the first and second drops.

Answer 2

very pale pink