The student recorded the mass of the cup + sample incorrectly and started with 2. In each ratio, the amount of reactants available limits the amount of reaction that occurs and the amount of heat that is produced, so if the volume is limited than the data will be less precise, because the ratios are further apart and can not be made at even closer intervals, to produce data that is more precise. Mass of crucible+ cover+magnesium 4. Hold the burner in your hand and move the flame slowly back and forth underneath the crucible to gently heat the sample. It can be assumed that this is close to a 6:1 mole ratio. This ensured that the temperature change had to be a result of the quantity of reactants being consumed, because there would be the same total volume of reactants.
Please flair yourself and read over the rules below before posting. I thought I was just missing something. Any infractions will be met with a temporary ban at the first instance and a permanent ban if there is another. The ultimate goal is to find out the chemical formula of the compound as well as a few other things. 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.
This specific experiment involved the occurence of an exothermic reation, so the measurable property was the heat given off and the temperature change of each ratio in comparison with the starting temperature. Set up a funnel for filtration b. One reason the error may have been so high is the fact that not all of the copper may have been transferred from the beaker to the filter paper. This would be the more accurate ratio, as it is reflecting the best fit values of temperature change, and would less likely be affected by any outliers. In the second example, the product is slightly magnesium-rich; the ratio of Mg-to-O is greater than the 1-to-1 expected. I ask because I'm confused.
In this experiment, you are using this technique to experimentally determine the empirical formula of magnesium oxide. Discussion of Theory: The method of continuous variations allows you to find the mole ratio of reactants. You seem to be assuming the formula of the salt is CuG where G is gluconate. The empirical formula of a compound gives the lowest whole-number ratio of the constituent atoms that is consistent with the mass ratios measured by experiment. Moles of Mg 0 00 56355H mole Show calculations.
If you don't know what G is, look it up. Standards Correlations Choose a standard to view standards correlations for this experiment. This is found by determining the moles of Mg and O in the product; divide each value by the smaller number; and, multiply the resulting values by small whole numbers up to five until you get whole number values with 0. I have included the worksheets so if anyone will help me work through them possibly explaining them to me like I'm five, I would be eternally grateful. Can you handle the rest? Mass of oxygen in the product 8. Obtain about 1 gram of the unknown copper chloride hydrate and place it in the crucible. During the chemical reaction, these reactants will produce some sort of measurable property, be it color, a precipitate, or in this instance, heat.
Alum Data Object Mass g Aluminum Cup Empty 2. Do not look into the crucible when it is heating. Most of the elemental copper will be on the aluminum wire. It is possible to identify the coefficients, A and B, for the reactants, without knowing the products of the reaction. Measure and record the mass of a clean, dry crucible without cover. When temperature change is found to be at its highest, that identifies that the amount of product formed is at its highest, because this measurable product occurs as a result of maximum consumption of the reactants. It's hard to read a long dialog like that.
I wasn't given the formula but this is what I have come up with so far. So here is one of your points of error. D Describe any visual differences between the hydrated alum and the dried, anhydrous form. Do not breathe the fumes generated. 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. Mass of empty crucible+ cover 7 384 2.
Never place anything hot on a balance. There is no data sheet. A crucible and Bunsen burner will be used to heat magnesium metal to burning. While the total volume of the solution is kept constant at 50 mL, the volume of each reactant is varying in the different ratios. If you see any blue-green crystals, reheat the sample until the crystals have turned brown. Thank you guys in advance for any and all help! This is an online chemistry course provided by eScience Labs and so far I am severely disappointed. When it has dried measure and record the mass of the filter paper and copper.
Obtain and wear goggles 2. Collect and wash the copper produced in the reaction. Mass of magnesium compound 7. Use small amounts of distilled water to wash all of the copper onto the filter paper on the funnel. Do not overheat the compound. When we first began transferring the copper we started by scooping it out of the beaker.
If the entire point of the worksheet is to find the chemical formula for Copper Gluconate, but they don't tell you what a Gluconate molecule looks like then the sheet is literally impossible without googling. This is relatively high, however it is less than 50% so it is not terrible. The reaction is exothermic, thus the mixture that generates the most heat energy will be the reaction that completely consumes both the hypochlorite and the thiosulfate ions. That is, will these errors cause the calculated number of moles of water in the hydrate to be artificially high or low? 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. Measure and record its mass, and then place the filter paper on the funnel. Mass of oxygen in the product 8. This is a problem because in this instance the mols of gluconate and copper should be equal.