Conflicting test results...........

[FormerBromineUser]

We usually say that if 1/2 scoop turns the water pink, then that's enough.

[JimK]

We usually say that if 1/2 scoop turns the water pink, then that's enough.

Some time ago I read that one scoop was sufficient if it turned the sample pink. Out of curiosity I compared using one scoop vs two (as recommended in the Taylor instructions); both turned the sample pink and both resulted in the same FC measurement.

[CarlD]

Yup. That's what we have been telling you all for years.

[chem geek]

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.