Proactiv Solution Essays

is added until the mark is reached (stock solution). In proportion to the expected chloride content aliquot part of this solution, which should preferably contain 50 mg – 100 mg NaCl, taken off, distilled water being added to obtain a quantity of approximately 100 mL. Subsequently 5 mL ferric alum solution, 20 mL 0.1 N AgNO3 solution and 5 mL – 10 mL ether or 1 mL nitrobenzene are added; titration is carried out by means of an ammonium thiocyanate solution 0.1 N, until the red colouring remains after

membrane, minus the difference in the osmotic pressure of the solutions of the feed and permeate side of the membrane which is written as. While the solute flux depends on the concentration gradient as: The membrane rejection is defined as the difference between the feed concentration and permeate concentration as: From the solvent and solute flux Equations.

find out how the Concentration of a Salt Solution will affect the mass of a Potato Investigation Background Information: In this investigation we are going to see how osmosis occurs in a potato and affects the mass by reducing or adding onto it. Osmosis is the diffusion of water between a semi-permeable membrane from a higher concentration to a lower concentration. Variables that can be explored in this investigation is how the concentration of salt solution could affect the mass as well as how

3.1. PHYSIO-CHEMICAL CHARACTERISTICS The characteristics vary from the source as well i.e. kitchen wastewater is considered to contain higher amount of organics and physical pollutants as compared to that of laundry or bathroom wastewater (Eriksson et al., 2002). Surendran and A. D. Wheatly (1998) have found that the characteristics of grey water were found to be similar to that of domestic sewage except in terms of the ammonia and bacterial content The physical characteristics of waste water considered

percent of sucrose solution out of the four variables; 0% , 5%, 10%, and 15%. After we filled the beaker we then got two potato cores. Once we had the cores we cut the skin off the ends. Following this we then cut the two potato cores into four 2.00 cm potato cores. After they were cut into 2.00 cm each we found the mass. We zeroed out the scale and weighed all four potato cores at once and recorded the mass. We then put those potato cores into the beaker of 75 mL of solution. With the potato cores

For this experiment, we studied how planarian worms would grow after being segmented. To begin this experiment, we filled up petri dishes half-way with spring water, this is so the planarian worms would not dehydrate and die during the two weeks we were observing them. Next, the planarian worm was picked up from its container with a pipette and then placed in a separate petri dish with some water. This took some time and I ended up having to use a pick to get the planarian worm off the inside walls

Abstract In this lab we separated a mixture to observe the methods of separating substances from one another using a series of techniques. In this lab we used magnetism, filtration, and evaporation to successfully separate the mixture into three separate components. Throughout the experiment we learned that mixtures are two or more substances combine and each substance retains its own properties and chemical identity. Purpose The purpose of this lab is to recognize the different techniques in separating

Determining Tonicity of Solutions as Compared to Decalcified Eggs   Abstract: Osmosis is the tendency of molecules of a solvent to pass through a semipermeable membrane, from an area of higher concentration to that of a lower concentration. The following experiment was designed to utilize this principle in order to determine the tonicity of a set group of solutions, as they related to eggs. In this experiment, decalcified eggs were placed into four different solutions, with mass measurements of

The purpose of this lab was to see the hydrogen bonding properties by doing multiple experiments that had exemplified such things. In the drops of water on a penny, I had gotten two pipettes and counted how many drops of that liquid, either being soap water or regular water, could fit into a penny. The second lab called “Water down a string” there was two beakers and string, which was dampened with water. Holding the string at a 45 degree angle, I had to pour water from one beaker at the top of the

The boiling point of the solution will be higher than that of the pure solvent itself. The boiling point of a liquid is the temperature at which its vapor pressure is to equal the atmospheric pressure. When a solute is added there are less solvent molecules near the surface and the solvent’s vapor pressure will decrease, so the vapor pressure of the solution will be less than that of the solvent. For the vapor pressure to reach the atmospheric

During the experiment, observations were made of their color, mass, height, and width. This data shows percent mass change of the gummy bear and how the gummy bear was affected by the salt water. It also displays how the height and the width of the gummy bear changed because of the salt water, which made the gummy bear more compact. The more salt that was added to the distilled water, the more compact it was, however, if there was not a lot of salt in the mixture, it became large and fragile. The

Density: A Characteristic Property I Purpose The purpose of this experiment is the density of six different substances. The way to figure this out is by finding the mass and volume of each of the substances. The hypothesis for the different experiments is that with each of the different substances and mixtures will be different depending on what they are. II Equipment The late nite lab was used to conduct this experiment. The product used were a balance, a graduated cylinder, water, Ethanol, and

sometimes couldn’t there be a better option? Although suspending students could be a good solution to a problem for a couple of days there could be a misunderstanding and a child could be punished without anybody knowing the story. School suspensions should be abolished for most occasions and other options should come into play to help the students, teachers and parents figure out the problem and the solution. If teachers would stop just handing out suspensions the students could talk to somebody

Qualitative Data: It was evident that after the potato cylinders were taken out from the sodium chloride solution after an hour, the ones that gained mass had increased in rigidity, becoming more turgid as well as appearing bigger than before. Their color also changed from distinct yellow to a lighter shade of yellow. On the other hand, potato cylinders that were put in a high concentration solution shrunk in size and they became shorter in length since they lost water. They felt softer, more flexible

of SDS solutions at various concentrations are tested for their conductance at two different temperatures, 25 °C and 50 °C. For detailed procedure, refer to the lab manual (J. F. Wójcik and T. S. Ahmadi, Experimental Physical Chemistry, 2015; p.125-129.). Data Sodium dodecyl sulfate has a molecular weight of 288.372 g/mol, with a density of 1.01 g/cm³. The melting point of SDS is in the ranges of 204 -205.5 °C. In this experiment, 8.6151 g of SDS was weighed to make a 500-mL 0.06 M solution. Before

fact that it has little to no sodium. This experiment is connecting to the pH scale because if I used water of a pH of 3 then for my next trial I use water of the pH 8 I would not have controlled data and to conclude there will not be any isotonic solution with a base percentage as a final answer. Therefore, we must use the same pH leveled water in order for the amount of salt to stay controlled throughout the whole

iodide solution to the water. We slowly stirred the mixture to make sure the potassium iodide was completely even throughout the water. We then took a dialysis bag and soaked it in water for few seconds to make it easier to open up the seal. We tied up one end of the dialysis bag with a piece of string and filled the bag with 13 mL of dissolved cornstarch in water. Then we tied up the other end of the dialysis bag with a piece of string and placed the bag into potassium iodide and water solution. We

to the investigation into the murder case. Data analysis revealed that Mr. Green had a specific reason for killing her. Further research revealed that Miss Scarlet had been poisoned by Mr. Green using a silver nitrate solution. It was found that Mr. Green’s silver nitrate solution had a molarity of 0.564 M using the balanced chemical equation. The conclusion that Mr. Green committed the murder and used silver nitrate as a murder weapon is supported by this evidence. This case is a reminder of the

Science Fair Assignment: Background Reasearch  The Scientists topic is making saltwater usable for plants. In this lab, the scientists will research whether boiling salt water will make it usable for plants. In this experiment Independent Variable is the salt water (1L). The dependent is how much salt is in the water (70g). The constants are the amount of water each plant gets (50 mL), the amount of sunlight, the same amount of seeds in each pot (5) and the constant is the pot watered with fresh

having a a solution and adding a solvent to it that would be immiscible with the solvent of the original solution. By adding this solvent and mixing it with the preexisting solution, the result will be a solution with two clear layers. The top layer would contained the aqueous solvent, while the bottom layer would contained the organic solvent. The layers are determined by the densities of the liquids, and in this experiments case the organic layer will be in the bottom. If a solution is miscible