My experiment involves titrating iodine solution against some sample solutions to find the amount of ascorbic acid in it. The indicator I'm using is 0.5% starch solution which will turn the solution to blue-black signaling the end point of titration.
However, the last time I conducted the experiment, I found that even 10 drops of the indicator was not enough to signal the endpoint of titration (no color change was observed). After I added the entire 100ml solution (containing 0.5g of starch + 95.5ml water), the color change could be observed.
But, I don't want to add 100ml of indicator for titration experiment in future. I was wondering if I could just add 0.5g (entire amount of starch in 100ml of starch solution) of starch powder directly instead of making a starch solution and then using it while titrating? If not, what can I do to make starch be able to detect the endpoint of titration without using too much of starch solution?