Thank you again for everything. This is a problem because in this instance the mols of gluconate and copper should be equal. After heating to remove the waters of hydration, the sample weighed 27. I have included everything pertaining to this lab. Please complete any questions as much as you can before posting. Note that the reaction produces a gas, elemental copper is forming on the surface of the aluminum wire, and the color of the solution is fading.
Use the glass stirring rod to break up the larger pieces of copper. Each mixture will have the same total volume and the same total number of moles of reactants. If you see any blue-green crystals, reheat the sample until the crystals have turned brown. The heat that is produced is directly proportional to the amount of reaction that is occuring; this means that the temperature change is proportional to the quantity of reactants consumed. We will not do your homework for you, so don't ask. I do not know if this is the correct ratio or not, but I think that because it asks where errors could have occurred, that it not being exact is acceptable. When using the method of continuous variations, the total number of moles is kept constant, but the ratios of the reactants are varied.
Measure and record the mass of the cool crucible of your copper chloride sample. Finding the Simplest Formula 1. Mass of magnesium compound 7. Measure and record the mass of a clean, dry crucible without cover. Rest the crucible on the clay triangle.
Experimental Notes Equipment List Caution: Eye protection is essential. Gently swirl the beaker to completely dissolve the solid. Identifying the mole to mole ratio of the reactants allows further stoichiometric calculations to be made. Also, I stand by the fact that without outside knowledge such as google there is no way to answer half the questions on this sheet. I wasn't given the formula but this is what I have come up with so far. Alum Data Object Mass g Aluminum Cup Empty 2. Transfer the brown solid to a clean and empty 50 mL beaker.
What I do not know is find out how many moles there are of the gluconate or how to figure out the chemical formula for my 0. Other than than a sheet explaining how to convert grams to moles there is nothing else included with this lab. Heating the product again causes the loss of water and conversion of the hydroxide to the oxide. Based on the masses of the solid reactant Mg and product Mg xO y , the mass in grams and the amount in moles of Mg and O in the product can be determined. Set up a lab burner and ignite the burner away from the crucible. Typically the mole ratios of reactants and products can be found from a balanced chemical equation, however when the formulas of the products are unknown, experiments can be conducted to discover this ratio.
I happened to note that point. Which number of moles Mg or O is smaller Oxysen is sualler moles of Mg moles of Mg rounded to a whole moles O moles of O rounded to a whole number Formula: M subscripts Copyright C 2014 Pearson Education lac. Introduction A balanced chemical reaction equation gives the mole ratios of the reactants and the products as coefficients. Neither you, nor the coeditors you shared it with will be able to recover it again. This is a very frustrating assignment. The lack of a gluconate structure or even formula is especially disturbing. Can you handle the rest? Collect and wash the copper produced in the reaction.
The molar ratios for each element are not equal in their example of MgCl2. Mass of crucible+ cover+magnesium 4. That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? I think we may have hit a dead end. Remove the filter paper with the copper from the funnel and leave it to dry. So here is one of your points of error. Moles of Mg 0 00 56355H mole Show calculations.
While the total volume of the solution is kept constant at 50 mL, the volume of each reactant is varying in the different ratios. There can only be one independent variable in an experiment. If you don't know what G is, look it up. Note that the color of the solution is green as the copper ions are rehydrated. Set up a funnel for filtration b.
At some point, you might want to make a fresh post, focussed on specific questions that remain. During the experiment, a constant volume of reactants was kept to ensure that the total number of moles of the reaction was also constant. It affects one chemical formula. Open flame will be present. The method of continous variations could be used by measuring other physical properties, such as the color of a reactant or product, or the mass of a precipiate that forms from a reaction. The best fit gives you a ratio that results from evaluating all the data as a whole, not just choosing the highest value and calling it the best ratio.
It has many practical uses including use as a fungicide and pesticide. When it has dried measure and record the mass of the filter paper and copper. Use a spatula to break up any large pieces of the substance by pressing the pieces against the wall of the crucible. It would have been higher if it weren't for our realization that we were supposed to pour the entire beaker onto the filter paper in the funnel. Advanced Chemistry with Vernier See other experiments from the lab book.