Would you guys mine checking my work? Thanks.
Na2CO3(aq) + CaCl2.2H2O(aq) ----> CaCO3(s) + 2NaCl(aq) + 2H2O
CaCl2.2H2O is Calcium Chloride Dihydrate, that is not a typo above just to clarify
Based on the stoichiometry of your reaction preformed during this experiment, how many grams of sodium carbonate were you required to add in order to have completely reacted with 1.00 g of calcium chloride dihydrate?
Answer: 0.721 grams?
If, during your reaction, that you actually produced 0.482 g of the precipitate, what is the percent yield of your reaction?
On both of these questions above, I am only concerned because the 2H2O (the hydrate) is throwing me off and I have no examples to relate it to to verify I am doing the problem correctly.
Why was it necessary to wait until the filter paper containing the solid product from your reaction to be completely dried before weighing it? (note: this was during after filtering with the precipitate still inside the wet filter paper - why must you wait?)
1. Weighing it wet would cause the theoretical yield of product to be higher than it really is.
2. Weighing it wet would cause the actual yield of products to be higher than it really is.
3. Weighing it wet would cause the actual yield of product to be lower than it really is.
4. Weighing it wet would cause the theoretical yield of product to be lower than it really is.
I said 3, is that correct?
Also, this one I am unsure of I guess because I haven't ran into this problem.
Which of the following substances formed a precipitate when mixed with sodium sulfate?
copper (II) nitrate
None of the above.
cobalt (II) nitrate
barium (II) nitrate
no solid formed
Here is my problem with this. Barium Nitrate would make the precipitate but ...Barium II nitrate? Never heard of it and barium only has one ion and that is Barium 2+. Since Barium has no other ions, wouldn't barium (II) nitrate be considered incorrect due to the fact a roman numeral shouldn't be used? Second, just in my option, "None of the above" = "No solid formed," so that makes me think barium is the right answer than. I find this question confusing.
Thanks guys. I'm just preparing for my final and want to verify I am doing this still correctly.