Hello there, I just weighted my barium sulphate samples and they have constant masses, so I assume they're good.
My problem is that they have different values at the third and fourth place after decimal separator : (3)97-(4)06-(4)16.
My professor says that I should probably discard the first result, as it's likely I've lost some mass due to poor crucible handling.
I, however, remember that I was the least careful when dealing with the third one. I think I was pouring sulfuric acid in larger portions, and it was probably most susceptible to occlusion.
The difference to me is still not big enough to support my argument. I think, if occlusion were happening at a higher rate, mass difference would be larger.
I'd like some comment on my reasoning. Maybe I should calculate the average using all three results?