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
It is essentially using the the mass of the product to figure out the original mass that we are looking for. Thus, the purpose of our experiment was to compare the final mass in our reaction to the initial mass and determine the change in mass. In our experiment, we utilized the hydrate cobaltous chloride. Hydrates are crystalline compounds in which one or more molecules of water are combined with each unit of salt. Cobalt (II) chloride hexahydrate is an inorganic compound which has a deep rose color in its hydrated form.
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.
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.
Aim: The aim of this experiment was to determine the empirical formula of magnesium oxide.
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
To investigate the temperature change in a displacement reaction between Copper Sulphate Solution and Zinc Powder
...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.
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.
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.
of Copper Sulphate. To do this I plan to work out the amount of water
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. ...
By using the equation, 'Cu² - 2e’ Cu (s)' and the formula Q = I x T
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.
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.