Australia's Science Forum

hi, i ordered some from science supply. we had the same problem. uneven heating causing black bases and breakages. so i covered one side of the wiregauzes with double layer of Aluminium foil. We have had one class use them so far and we had no breakage or black bases. I am waiting for other classes ...

ammonium thiocyanate ;MW= 76.12g. To make 1 litre of 0.5 M solution, dissolve 38.06g in water.