Final point: Using a pre-computed amount of KOH is very tricky. KOH is very bad with respect to composition. Commercial high quality KOH may be less
than 90% pure, the rest being water. It can also be 85% pure, the rest being water, or maybe 95%. Who knows..... KOH can be very pure, except for
water content and the amount of water in it is very variable. So, yoy need to add KOH, until no more precipitate is formed. That, however, is a very
cumbersome thing to do. One can also add some excess KOH. |