[JHQ415]

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?

Thanks.

[shchavel]

Hello!
We need some more information to do any conclution: what is your samples like? solution or solid state? How much do you use for test? (ml or g). Give us all numbers!