Quote Originally Posted by FormerBromineUser View Post
We usually say that if 1/2 scoop turns the water pink, then that's enough.
The main reason to use one level scoop for a 10 ml sample and a heaping scoop or possibly two level scoops for a 25 ml sample is to have a stronger color transition at the end of the titration. With too few scoops, you may undercount but probably by only one drop which is usually not a big deal.