In our school we were supposed to collect 5 different types of powders set up by the teacher in the classroom. Unfortunately, my group was the last, therefore, we barely got any powders and no other groups would share theirs. So basically, I was planning to do a Ph, Water, Biuret, Iodine, Vinegar, and heating test in order to identify each powder based on their properties. However, I don't know how much powder I will need for each test. Does anyone have any advice?