A graduated cylinder was used to measure 200mL of distilled water into an Erlenmeyer flask and then 40mL of 0.6 M NaOH was added to the distilled water in the flask. The flask was then plugged with a rubber stopper and shook in order to mix the solution. A buret was then washed, rinsed with distilled water, and then 5 mL of the NaOH diluted solution. After the cleansing of the buret, it was then filled up with the NaOH diluted solution. The dilution of the solution was calculated to find the molarity of the NaOH.…
Half of the measuring cylinders were filled with 60oc water, and the other half with 25oc water. Tests of the water were carried out with an iodine test and diet stix to detect any starch that had been broken down and passed through the tubing. The results from the tests show that there were experimental errors, and the experiment should be carried out again to…
To begin Lab 10 of Chem 115, students received permission to start the lab procedure after completion of prelab. First, students made a 25.0 mL of a 0.15 M Malonic Acid and 0.20 M Manganese Sulfate Monohydrate solution and labeled it "Solution 1". After the solution was made, a piece of parafilm was used to seal the flask before mixing it well. Next, a 25.0 mL of a 0.20 M Potassium Iodate solution, using 0.080 M sulfuric acid as a solvent, was made. Before adding the acid, students heated about 25 mL of the acid in a 100 mL volumetric flask.…
11 out of the 36 mixtures were insoluble and because we found this out by solving the Pre-Lab questions when 10 drops on each solution were mixed and a formation of a reaction was formed the chemical for that reaction was estimated to be one of the 11 mixtures with the precipitate colors. In Lab the test tubes that were used was rinsed with distilled water tree times and put into the bin of used test tube. A new thing that was learned in was was the fact that the test tubes were put in to the used test tube bin and not used after the rinse with distilled water. The second very important thing that was learned in lab was if the test tubes aren’t cleaned well enough then there is a high…
The seconds between beginning the timer and recording data and the slight overestimation in substance amounts. This experiment could be improved by having precise measurements and using numerous catalysts during the experiment to test the speeds of the reaction.…
All of this matters and is important to know about because it is key to understand the background of the experiment beforehand. This investigation relates to past research based on the…
The alkaloid content was determined gravimetrically using [19]. 101 Five gram of each sample was weighed using a weighing balance and dispersed into 50 ml of 10% acetic 102 acid solution in ethanol. The mixture was then allowed to stand for about 4 h before it is filtered. The 103 filtrate was evaporated to one quarter of its original volume on hot plate.…
Observing the Effects of Osmosis on Model Cells of Different Sucrose Concentrations Cells are the building block of life. But these cells aren’t a closed system. There is a constant movement of various molecules in and out of the cell that brings nutrients in and brings waste out. This movement of particles in and out of cells is based around osmosis.…
Observing Osmosis INTRODUCTION Osmosis is the “diffusion of water across a selectively permeable membrane” (Raven et al. G-16). In this experiment, dialysis tubing was used to mimic the selectively permeable membrane to show what osmosis does when placed in different solutes. We filled dialysis tubes fill with different percentages of solute and placed them in beakers full of a different solute. Through this experiment, I saw what happens when the solution becomes hypertonic, hypotonic, and isotonic. My hypothesis was that bag A would shrink because the water would leave the bag to go to the higher concentration.…
Below is shown the equation for the dissociation of acetic acid into acetate. The experimental…
Determining The Process of Photosynthesis And Cellular Respiration Using Elodea and Yeast Introduction Photosynthesis is an essential process to life on earth, in which plants and other organisms use sunlight to create food from oxygen, and carbon dioxide. Cellular respiration is when energy in food is released and converted to ATP, which is then used as chemical energy to complete tasks within a cell. This process usually requires oxygen and releases carbon dioxide. Photosynthesis and cellular respiration are similar in some areas and different in others. The purpose of both of the process is to produce energy, but they have different ways of achieving this goal.…
By using these concepts and techniques, we created a dilution curve to display and understand our data. Procedure1 Materials The materials used in this experiment are whole grain cereal, Sodium Acetate, water, hydrochloric acid, 2-2 Dipyridyl solution, Hydroxylamine-HCl, and D.I. water.…
Different types of solutes do have an effect on the rate of osmosis in potatoes. For each of the following solutes used: salt, sugar, baking soda, cornstarch, cocoa powder, and tap water with no solute, the percent change of mass at the end were different. The solute with the highest percent change in mass was salt, followed by baking soda and sugar. This is due to the difference in the amount of solute in the solution and potato strip. The initial hypothesis was incorrect as the potato strip in a solution of salt and water had the greatest percent change in mass, though the potato strip in sugar still had a significant percent change in mass.…
Iodine is essential on the new plant and this is why. Iodine is a key component of the hormones made in the thyroid gland. These hormones are absolutely critical to human health, helping to control energy production and utilization in nearly every cell of the body. David Brownstein explains in his books “Iodine: Why You Need It, Why You Can’t Live Without It”, how iodine is crucial in a person’s life by saying “My experience has shown that iodine in doses ranging from 6-50mg/day is adequate to provide iodine for the vast majority of the population” (pg. 109) and “Chemical substances made by the thyroid gland, which is located in the front of the neck. This gland uses iodine to make thyroid hormones, which are essential for the function of every cell in the body.…
The purpose of this step is to remove any water that adheres to the compound that would lead to an inaccurate mass. A known mass of about 0.12xx grams of KIO3 is then weighed and dissolved with water in an Erlenmeyer flask. Excess KI and HCl was added to react with KIO3 to form I2 in the following equation: KIO3 + KI + HCl KCl + I2 + H2O. Since KI and HCl is added in excess, the reaction will be forced to the right due to Le Chatalier Principle. It is important for the titration process to be carried immediately after HCl is added since iodide oxidizes readily in the presence of oxygen in air due to an acidic environment. The resulting I2 is then titrated with the thiosulfate standard.…