Experiment: EXP5-Percent of Water in Hydrated Salt Manika Srivastava Lab Partner: Natasha Seebaran Chem 1300/DA3 Date: 1/30/18 Professor Richard H. Perry Abstract: The purpose of this experiment was to determine the percent by mass of water in a hydrated salt as well as learn to handle a laboratory apparatus without touching it. The mass of water lost in grams for trials 1 and 2 are 1.7220g and 1. 2993g.For trails 1 and 2 the percent by mass of volatile water in hydrated salt came out to be 57.4% and 43.2%. This resulted in the average percent of H2O in hydrated salt is 50.3%. Introduction: The Main Purpose of this experiment was to determine the percent by mass of water in the hydrated salt. The second purpose was to …show more content…
Mass of Hydrated salt = Mass of fired crucible, lid and Hydrated salt – Mass of fired crucible and Lid. • Trial 1 = 56.3320- 53.3320 = 3 Trial 1 mass of Hydrated Salt = 3g • Trial 2 = 56.0963-53.008=3.0075 Trial 2 mass of Hydrated Salt = …show more content…
We fired and massed the crucible, lid, and hydrated salt four different times to evaporate the amount of water in the hydrated salt. This resulted in a change in mass which could be used to determine the percent of water in the hydrated salt. The purpose of firing and measuring the just the crucible and lid is to determine the initial mass of the crucible without the salt. Between trials, the crucibles mass changed decreased by
After the water temperature began to stabilize, the highest constant temperature was recorded. This data was used to calculate the calorimeter constant. This enter procedure was repeated to calculate another calorimeter constant in order to find the average of both answers. After that value was calculated, a 600 mL beaker was filled with 300 mL of water and heated till it started boiling. An unknown metal located on the instructor's bench was obtained and the mass was calculated.
To do this we created proportions. We calculated that we need to put .25 mL of salt in 50 mL of water to create .5% salinity, 1.5 mL of salt in 50 mL of water to create 3% salinity, and 2.5 mL of salt
Now, they are ready to start the lab. The empty crucible is weighed by and the weight was recorded. Then the students used a disposable pipet and put close to 4.0 grams of their milk sample in their crucible on the scale. The crucible was then placed back on
The appearance after this period resulted in another color change back to white. The crucible, lid, and hydrated copper sulfate was weighed again to calculate the mass of water lost by dehydration (described in table 1.3). This was done by subtracting the final mass by the initial mass of the crucible, lid, and compound. The mass of the crucible would remain unchanged while the mass of the compound would be altered. This trial was repeated 3 times and 1 extra set of data was taken from 2 separate groups to include
Main Show Tank Calculation: The main tank has a radius of 70 feet. What is the volume of the quarter-sphered sized tank? Round your answer to the nearest whole number. You must explain your answer using words, and you must show all work and calculations to receive credit.
(1) If the crucibles were not put in the oven at the end of the experiment, there could be excess moisture trapped in the crucible. This contributes to the mass of the weighed crucible at the end of the experiment, meaning the mass would be higher than it would normally be. After calculations, it can be concluded that the moisture in the crucible shifts the data up, creating an artificially high concentration of Al3+. (2) Reading the volumetric pipet to 25.00mL is an incredibly crucial step in this experiment because it’s the only source of Al3+ that is added to the reaction. This step affects the end result when weighing the precipitate because in the reaction, the Al3+ is the limiting reagent and is in a 1:1 stoichiometric ratio with the precipitate product.
Using the equation m = ΔTf/Kf , the molality of the unknown solution was found. Then, moles of unknown were calculated, which was used to calculate the average molar mass of unknown. Theory: After the experiment was completed, the data
Part A: Osmosis practical task Aim: To observe the effects of osmosis in rhubarb cells. Hypothesis: Water will be extracted out of the cells in the salt solution causing the cells to look different to the cells in the freshwater solution. Materials: Rhubarb Distilled water in a dropping bottle Salt solution in a dropping bottle Microscope, slides, and coverslips Forceps and razor blades or scalpel Paper Towel Method: Clean and dry a slide and coverslip.
They were given the labels of “HCl”, “Na2S2O3”, and “water”, as was done to the beakers. The “water” syringe was then used to extract 2 mL of water from the “water” beaker. The syringe was examined to verify that no air bubbles were made in the syringe. The water was then translated into Well #3. Next, the “HCl” syringe was used, taking 1 mL of HCl from the “HCl” beaker, and then translated into Well #3 as well.
In the first experiment with the tap water, the gummy bear increases in both mass and volume. This means that the gummy bear was hypotonic to the tap water, since the water flowed from the cup into the the bear. In the second experiment with salt
My hypothesis was correct. The raisins increased in mass because of the absorption of the water. The mass of the raisins before they were put in the warm water was 2.69 grams. The mass of the raisins after were put in the warm water was 3.13 grams. The mass of the raisins increased .44 grams during the process of osmosis.
The overall project goals and central questions that has to do with the project is mostly trying to determine the isotonic concentration of the salt in potato roots and the use of the ideal soil salt conditions for the potato plant growth. In part 2, we had to test the enzyme activity that is in the was involved in the potato, so we can also determine the ideal soil pH conditions for the potato plant growth. In part 3, we were able to test absorb the leaf pigment at various wavelengths that determine the optimum light absorption conditions and was able to make recommendations for the light conditions that would be used un greenhouses. The goal of the first project is to determine the ideal soil salt for potato roots and we can relate this to the project is to find out if Solution A or Solution B has more solute in it. The goal of this project is to determine the meaning of Osmosis.
Seed germination is crucial when looking at a seed's life. It is the beginning of its existence and plays a key role in how the seed will grow from there on out. When looking at seed germination dealing with various salt concentrations, the outcome of the experiment can result in many factors. If salt concentrations affect the rate of seed germination, then a positive control of water would germinate faster than the affected seeds with various diluted salt concentrations. In the end, the effect of the assorted salt concentrations does tend to slow down the rate of germination with all of the different concentrations.
Abstract: This Extended Experimental Investigation assessed the effects of the chloride salts; Lithium Chloride, Sodium Chloride and Potassium Chloride on levels of dissolved oxygen in samples of distilled water. The three salts and a control solution of pure distilled water were titrated thrice, each using the Winkler method, to determine the quantity of dissolved oxygen within the samples. It was expected that the saline solutions would have decreased dissolved oxygen content and that the larger the salt’s cation, the more oxygen would remain in the solution. The results portrayed that an increase in salinity, does decrease the levels of dissolved oxygen in water, however the results displayed that the larger the dissolved cation, the less dissolved
Weight a clean, dry, porcelain evaporating dish on the electric balance and record this mass on an appropriate data table. If the crucible needs to be washed before use, then heat the crucible in the Bunsen burner flame for a few minutes and remove any residual water. Then allow it to cool before continuing. Fill the crucible about 1 gram with the hydrated salt and reweight. Assemble the ring stand, ring, clay triangle, and Bunsen burner