I don't know if I should keep my hypothesis as it is or change it to what I thought was the prediction. 2H2O, then y g of Na2CO3 will be needed and z g of CaCO3 will be produced? I ask because I've been reading some lab reports I could find online which state facts and figures using if/then, and I am confused because I thought they were supposed to be 'prediction' and not the hypothesis.That leads me to the question, do you think I should change the hypothesis to more of a statement with facts and figures? For example, instead of using a general statement like the reaction will happen according to the stoichiometry, should I say something like if we want the maximum precipitate with the given x g of CaCl2 Since my results were fairly close with what I thought it was going to be, I should've said that my results supported the hypothesis instead of saying that they proved it. I have been thinking about this for while now, but I decided that I really need the perspective of others on this. Was it my hypothesis that was wrong? Or is there some other reasons from this experiment that can support my hypothesis? We did the experiment just to get a single piece of the final data (percentage yield) to prove that this reaction occurs according to its stoichiometry, and I don't know what else from the experiment can be used as evidence to support the conclusion. The problem is, my instructor has instructed us to provide 3 reasons or evidences to back our conclusion up and I simply don't see how this can be done. My conclusion was that my hypothesis is true, and I got a 80-90% percent yield for the precipitate which I believe would be close enough to prove it. This is a pretty straight forward experiment as I see it, but I don't know what exactly it is supposed to 'prove'.Īll I could think of was that this was an experiment to show that reactions occur in stoichiometric quantities, so my hypothesis was that the complete precipitation reaction between sodium carbonate and calcium chloride dihydrate will be occurring according to the stoichiometry of the balanced equation. (Using proportions and molar mass)Ĭalcium carbonate will be in precipitated form, so we proceed with the precipitation reaction to get the actual yield of the precipitate and calculate its percent yield using the theoretical yield we had calculated above. We are initially given a certain amount of calcium chloride dihydrate we will be using in grams, so we calculate the amount of sodium carbonate needed to get the maximum yield using stoichiometry, and calculate the theoretical maximum yield of the calcium carbonate. It's a reaction between sodium carbonate and calcium chloride dihydrate to create calcium carbonate, sodium chloride, and water. After performing the reaction, we calculate the percent yield of product. I don't even really know what the hypothesis should be to begin with.īasically, we use stoichiometry to determine the amount of reactant needed to create the maximum amount of product in a precipitation reaction. I'm currently writing the lab report for the the 'Stoichiometry of a Precipitation Reaction' lab, and I'm having trouble with drawing a conclusion to prove the hypothesis with multiple reasons using the data from the experiment to back it up. Hi, I really need help with my lab report.
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