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Solubility test lab
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Purpose
The purpose of this experiment is to use our knowledge from previous experiments to separate a copper compound and from there make calculations relevant to the experiment. The calculations that we had to make in this experiment had to do with finding the percentage of copper in copper compound and from there find the formula weight of the copper compound.
Question or Problem
The question that was proposed by the instructor for investigation was: Can the % composition of an element in a compound be determined accurately (Lab Manual 61)?
Background Discussion
For this experiment we have to use physical and chemical methods to separate the copper from the copper compound. In this experiment one physical method and one chemical method was used. The physical method that was used was filtration which is the separation of a solid from a liquid by passing the liquid through a porous material, such as filter paper. The chemical process used involved mixing a chemical into the compound to separate the copper from the compound (Lab Manual 33).
Sample Calculations and Equations
In this experiment there were three different equations used and they were, The Net Ionic Equation, Calculating the percent of copper, and the last one was a mathematical formula that represents the relationship between theoretical percent copper of a particular compound and its formula weight (Lab Manual 61). The last equation was changed in order to find the fwt, so I will provide the edited equation also.
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...sition of an element in a compound accurately. To do that I used one physical methods and one chemical method to obtain the copper from the compound. The physical method was filtration and the chemical method involved pouring certain chemicals into the compound to separate the copper from it. I was unable to fulfill the experiment due to an error in the experiment which effected mathematical equations negatively and in turn gave me a faulty result. I believe the experiment was a failure due to the possibility of an inaccurate measure of one of the chemicals or compound which gave out faulty results. In conclusion my experiment was a failure due to a mistake in the experiment.
Works Cited
Griswold, Norman E. "Standardizing a Sodium Hydroxide Solution." General Chemistry For Engineering And Science I. Mason: Cengage Learning, 2012. 141-48. Print. Signature Lab Ser.
The Separation Challenge is an experiment involving the use of background knowledge of mixtures, properties of matter, and creativity in order to find a solution to separate three different substances layered on top of each other within a container. The experiment required a matter of coming up with a solid and thought out procedure to successfully separate the three substances individually within an amount of time using various lab materials and technology accessible at the time.
The mixture was poured through a weight filter paper and Sucrose washed with a 5ml of dichloromethane. The resulting solid was left in a breaker to dry for one week, to be measured. Left it in the drawer to dry out for a week and weighted it to find the sucrose amount recovered amount.
The question that was proposed for investigation was: Can the theoretical, actual, and percent yields be determined accurately (Lab Guide pg. 83)?
The purpose of this lab was to calculate the percent composition by mass of oxygen in potassium chlorate.
We were then to make a base solution of 0.7 M NaOH. In order to standardize
...e been beneficial to the experiment. An error may have occurred due to the fact that measurements were taken by different individuals, so the calculations could have been inconsistent.
Possible sources of error in this experiment include the inaccuracy of measurements, as correct measurements are vital for the experiment.
== = == Hypothesis for the experiment: After I conduct this experiment, I expect and suppose I can recognize and physical changes, identifying the difference these two kinds of changes. Also, I will be able to know some physical and chemical properties of copper (II) sulfate, water, iron, sodium carbonate, hydrochloric acid and magnesium and identify if it is a chemical change or physical change in each part of the experiment.
One possible source of experimental error could be not having a solid measurement of magnesium hydroxide nor citric acid. This is because we were told to measure out between 5.6g-5.8g for magnesium hydroxide and 14g-21g for citric acid. If accuracy measures how closely a measured value is to the accepted value and or true value, then accuracy may not have been an aspect that was achieved in this lab. Therefore, not having a solid precise measurement and accurate measurement was another source of experimental error.
But for preliminary work, we would only need three different strength solutions. These are the absolute max, the absolute zero and the middle, 100%, 50% 0% solutions. We’d cut three potato chips, weighed them, noted this down and then put them in the solution. We’d make the solution by mixing distilled water with a salt solution. The solutions we’d use would be in the ratio 100% solution to 0% solution, so it was 1:0, 1:1, 0:1.
By doing this experiment, I can know the physical and chemical properties of these samples. After I get my results about the physical and chemical properties of these samples, I can compare my results with the information given by the past student and identify the 5 unknown samples, finding out which sample is which substance. Hypothesis = ==
We used a crucible tongs to place a dry, empty graduated cylinder on a zero out balance. We recorded the mass of it which was 26.30(g). After we pour 3.14-mL of the unknown liquid into the graduated cylinder; this is sample 1. We used the same procedure to read the graduated cylinder of the unknown metal by reading it at the meniscus with an index card from behind. We recorded the volume. We then weigh the first sample and recorded the mass to be 28.64. Do not remove the first sample from the graduated cylinder. Next we added an additional 3-4-mL of the unknown liquid to the first sample. The combine number is 7.35-mL to the nearest .01-mL for sample 2. We then recorded the mass of the unknown sample, 32.14(g), in grams on a balance. Again, do not pour out the unknown liquid from the graduated cylinder. We added more of the unknown liquid until it was nearly but not over 10-mL. We recorded the volume for sample 3 to be 9.39-mL. Then weigh the sample to be 33.78(g). Pour the liquid back into the original container; do not pour the liquid down the
of Copper Sulphate. To do this I plan to work out the amount of water
For this experiment we used titration to standardize the exact concentration of NaOH. Titration is the process of carefully adding one solution from a buret to another substance in a flask until all of the substance in the flask has reacted. Standardizing is the process of determining a solutions concentration. When a solution has been standardized it is referred to as a standard solution. To know when a solution is at its end point an indicator is added to acidic solution. An indicator is an organic dye that is added to an acidic solution. The indicator is one color is in the acidic solution and another color in the basic solutions. An end point occurs when the organic dye changes colors to indicate that the reaction is over (Lab Guide pg. 141).
There is also the potential of human error within this experiment for example finding the meniscus is important to get an accurate amount using the graduated pipettes and burettes. There is a possibility that at one point in the experiment a chemical was measured inaccurately affecting the results. To resolve this, the experiment should have been repeated three times.