The expected moss of anhydrous copper (II) sulfate should have been .834g instead of .694g. The water lost through the heating should have been .471g instead of the .694g that was actually lost. The water lost was much larger while the mass of the anhydrous copper (II) sulfate was much smaller. If the mass of the water lost was too low than something that could have caused this is that the hydrated copper (II) sulfate was not heated correctly. Not all of the water would have been evaporated if the crucible was taken off the Bunsen burner to soon. If the mass of water lost was too large than something that could have caused this is the loss of copper (II) sulfate during the experiment. This could have occurred through the mixing of the hydrated copper (II) sulfate while it was burning on the Bunsen burner. …show more content…
This would have caused the mass of the product to be much smaller than it was supposed to be. Another scenario that can explain this is that the copper (II) sulfate was heated passed its anhydrous state and caused the breaking down of copper (II) sulfate. In part two of the experiment the formula of the hydrated magnesium sulfate was calculated to be MgSO4 ·8H2O. The formula name would be magnesium sulfate octahydrate. The correct formula is MgSO4·7H2O meaning the name should have been magnesium sulfate heptahydrate. The larger amount of water loss could have been caused by the excess heating of magnesium sulfate resulting in some magnesium sulfate breaking down. Another error could have been that some of the magnesium sulfate was taken out during the stirring process with the spatula. Some magnesium sulfate could have been left on the spatula and not put back in the
The sand is If the water with Alka-Seltzer tablets is stirred during the reaction, then the rates of reactions will increase because the particles will be forced to make contact with each other and... ... middle of paper ... ...results anomalies because they are the outcome of dissociation of calcium and magnesium ions,. Evaluation: What is the difference between My results were very reliable, because by looking at my graphs I can see a trend that relates to my scientific background. It is also evident that I have obtained a reliable set of results when I see that.
We began this investigation by suiting up in lab aprons and goggles, we then gathered our materials, found a lab station and got to work. We decided to start with the magnesium in hydrochloric acid first, we measured out 198.5 L of HCl and put it in the foam-cup calorimeter and took initial temperature reading. We then selected a piece of magnesium ribbon and found its mass: 0.01g. This piece was placed in the calorimeter and the lid was shut immediately to prevent heat from escaping. We “swirled” the liquid mixture in the calorimeter to ensure a reaction, and waited for a temperature change. After a few moments, the final temperature was recorded and DT determined.
The crucible itself weighed 22.04 g so together the baking soda and crucible weighted 23.04 g at the beginning. At the first weigh-in, after two minutes over the fire, the cup and powder weighed 22.67 g, meaning that something had occurred and the weight of the powder had decreased to .63 g. We placed the crucible back onto the fire and waited another two minutes to see if it had already stabilized or if we had to wait a bit longer for that to happen. At the second and third weigh-ins the weight had not changed much at all, only .02 g and .01 g, respectively. Decidedly, nothing much had changed, so we finished the experiment then, meaning .38 g of sodium bicarbonate had been lost in the reaction. The stoichiometry we did showed us that the first reaction of sodium bicarbonate decomposing into sodium hydroxide and carbon dioxide was the correct equation, because our math showed us that we should be left with about the same amount of the product as we were left with when we performed the experiment. The second and third times we did the experiment gave us the same results, even though we left the cup over the fire for five minutes instead of two, and for the third time we used a larger amount of baking soda to see if it gave us a different outcome (we left it on for five minutes again, but we still got the same result as the previous two
The washes needed to be performed and during this lab it was important to make sure that no aqueous layer remained in the organic layer. This is important for when the final product is distilled in an air tight condenser (with no water flow). The temperature would have gotten fairly high that the water either would’ve distilled out before the final product or would have caused the glassware to break due to temperature difference occurring in the setup. A better yield could have been achieved during the drying of the product, which facilitated some loss of product if there would have been some aqueous layer remaining in the organic
Various sizes of potato cores may cause a change in the data because different sizes may be able to absorb more or less salt concentrated water, resulting in an inaccurate mass measurement. A solution to this could be a different method to cut the potatoes so that they’re equally sized for more accurate data, possibly by using a vegetable slicer or something of the sort. Another thing that could have affected the data is the plastic wrap. We covered our cups with plastic wrap, but it didn’t stick very well to the cups. This made it so that our cups were not securely covered, and the amount of air that was able to leak into the cups over the 24 hours may have affected the results. Perhaps we could’ve used stickier plastic wrap, or maybe used rubber bands as well to secure the plastic wrap
ash was boiled for 5 minute with 25ml distilled water by covering the crucible with a watch-glass on water bath then cooled. The watch-glass was rinsed with 5 ml of distilled water and this liquid was added in to the crucible. The % of remaining content was deducted from initial % of ash taken (i.e. 100%) to determine the water soluble ash value.
An Investigation into Electrolysis - Copper Sulphate Introduction Decomposition caused by electricity is called electrolysis. The electrical energy causes a chemical change. When a salt is dissolved in water, its ions become free to move so the solution can be "electrolyzed." The products of the electrolysis depend on the chemical solution, its strength and the type of electrode. The cathode is negatively charged and therefore attracts to it positive ions.
Copper Sun is a book about a fifteen year old girl named Amari who was stolen from her village by white slave traders, and lived a horrible life as a slave until she finally escaped.
By using the equation, 'Cu² - 2e’ Cu (s)' and the formula Q = I x T
Copper is an important element that has a significant role the function of enzymes. Copper acts as a cofactor in many essential enzyme reactions such as those involved in metabolism. Nevertheless, copper is a redox-active transition metal and is linked to generating reactive oxygen species (ROC). Especially under anaerobic conditions when copper is in its oxidative state. So copper can be highly toxic to cells and lead to cell death even in very low concentration. Its antimicrobial properties are evident by its use by white blood cells such as phagosomes as a mechanism for killing engulfed microbes. Staphylococcus aureus contains copper related genes, such as copA, which allow it to tolerance of excess copper, are virulence mechanisms.
Electrolysis of copper sulphate solution and copper electrodes. Introduction: For my GCSE Chemistry assessment, I will be investigating the electrolysis of copper sulphate solution with the copper (ii) plates. Aim: To be able to My intention for this observation is to find out how the current has an effect on the mass of copper deposited in the electrolysis of copper sulphate and copper (ii) plates.
...actual heat of reaction for Part II was -146kJ/mole. The heat of formation found for the formation of liquid water was -286kJ/mole. By using Hess’s Law, the heat of reaction for the formation of magnesium oxide was found to be -496kJ/mole which yielded a -17.6% error.
To investigate the temperature change in a displacement reaction between Copper Sulphate Solution and Zinc Powder
A possible random error within the experiment may have caused scatter within the results is parallax error. This error may have occurred every time a measurement was taken from a measuring cylinder. This could have caused the time for the cross to disappear to be higher or lower than anticipated. If more thiosulfate were added, the reaction would have a lower average time and therefore a higher reaction time. The results showed that some data points had a higher reaction time than anticipated, meaning that this is a possible source of error within the experiment. ...
This is because the 10cm3 of water has replaced 10cm3 of acid molecules, so now there are less acid molecules to collide with the Mg ribbon. = Magnesium molecule = Hydrochloric acid molecule = Movement Planning 2: [IMAGE]Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen [IMAGE]Mg + 2HCL (aq) MgCl2 + H2 (g) The information in the paragraph that follows was researched from a secondary source, which enabled me to further plan my investigation. According to the collision theory, the more concentrated the reaction the greater the number of collisions between reactant molecules.