a. If the xble is not brought to constant weight, meaning that it has some additional mass to lose, I don't think the mols Mg will be affected because the xble is weighed with the Mg cold.
b. Some of the solid is Mg3N2. Since N2 has a lowr mas than O, the Mg3N2 will weigh less than it should as MgO which means the oxygen content appears to be lower.
c. Mass is lower than it should be which makes us think less O was added.
d. Loss of a chip is the same as loss of sample.
Mg and O lab
how will the relative number of moles of mg and o be affected if the following procedural errors are made?
a)crucible is not brought to constant mass before the Mg is added.
b)water is not added after the first heating of Mg, and the entire solid in the crucible is considered to be MgO
c)some of the fluffy white ppt is lost before the crucible is weighed for the last time.
d)in an effort to begin a second sample while the first is cooling, the hot crucible containing the solid from determination 1 is accidently dropped, and a small chip is lost from the crucible.
i said b was a higher value for O because the mass of our product would be higher and we determined the mass of O by subtracting our mass of Mg used, in a previous calculation
i said the decrease in the amount of O for part c because of basically the same reason; we have a smaller product so we would calculate a smaller amount of O
the other two i'm not sure of and am kind of confused.
if you could check mine and help me with the others?
please be specific!thanks!
1 answer
1 answer