Concentration

The formula for measuring concentrations (Molarity) is moles/ Volume. The molarity of the diluted sample is 3.5 x 10^-6 M and the volume is .005 Liters. Then solve for moles by multiplying the two knowns the product is 1.75 x 10^-8 moles. All existing moles came from the .001 Liters of the unknown sample. The moles should then be divide them the volume, which is 1 ml. The final answer of the unknown concentration is 1.75 x 10^-5 M. Absorbance and concentration are directly related. So if .1 M has

Concentration of Iron in an Unknown Substance Jack Boswell Experiment 5 Megan Otting and Dr. Caster Introduction: The objective of this lab was to determine the concentration of iron (Fe+2) in an unknown substance using a spectrophotometer. Spectrophotometry is a process that uses a sample solution to determine how much light a chemical substance absorbs by measuring the intensity of a beam of light passing through the solution. Every substance transmits light over a specific wavelength range

movement is diffusion, where solutes move from an area of high concentration to low concentration. Diffusion is directly related to molecular kinetic energy, taking in no energy input. The movement of a solute from an area of low concentration to high concentration requires energy input (ATP). The process by which water moves through membranes by a special kind of diffusion is called osmosis. Like solutes, water moves down its concentration gradient. Water moves from areas of high potential to low potential

Enzyme Concentration: Cuvette 2 gradually increased every twenty seconds for two minutes and contained 1 milliliter of the enzyme (figure 1). Cuvette 3 slowly increased but was a bit faster than cuvette 2 every twenty seconds for two minutes and contained 2 milliliters of the enzyme (figure 1). Cuvette 4 was started lower then cuvette 2 and 3 then made a significant increase every twenty seconds for two minutes and contained 4 milliliters of enzyme (figure 1). The average rate of absorbance for cuvette

ariables The independent variable was the concentration of sucrose in the dialysis tubing we used as a simulated membrane. The dependent variable was the percent increase in mass of the dialysis tubing. We can use this to compare how osmosis increases or decreases as solute concentration increases. Hypothesis We hypothesize that as the solute concentration increases, more water will diffuse into the dialysis tubing (shown by a greater percent increase in mass). We know that water will move through

Solute Concentration of Potatoes Block 2-2 Purpose: To determine the concentration of solute in the potato’s cytoplasm by measuring the change in mass after the process of osmosis. Materials and Equipment: Refer to Biology 12 Lab Manual – Investigation 13 Procedure: Refer to Biology 12 Lab Manual – Investigation 13 Data and Observations: The Potatoes change in mass after the process of Osmosis Test Tube # | Concentration of Sucrose

was used to determine the concentrations of fluoride in mouthwash and tap water. Bottled water was also analyzed by the calibration curve, but the results were flawed as the concentration of fluoride did not fall in the range of the calibration curve. Mouthwash was first analyzed by a calibration curve, which was determined to have a fluoride concentration + standard deviation of 194.5 + 34.9 ppm. Analyzing mouthwash with standard addition resulted in the concentration being 91.9 ppm. The volume

response to gradients of concentration, pressure, or temperature (G. Audesirk, T. Audesirk, B. Byers). Diffusion is the passive movement of molecules or particles along a concentration gradient, or from regions of higher to regions of lower concentration (Diffusion). In the experiment, osmosis and diffusion occurred where the results indicated a change in mass when the egg was placed in different concentrations of corn syrup solution. My hypothesis stated that if the concentration of the solute is lower

By using the average absorbance of every solution prepared here, and knowing the concentration of standard iron added to each, a standard addition curve was constructed with the purpose of determining the original concentration of iron. Figure 3 Illustrates the standard addition curve constructed using the data from Table 1. The line of best fit is also included in the graph, as well as the equation representing it and its coefficient of determination. Slope Intercept 0.0699 0.1024 Slope STDEV

Choudhury Asif Ibne Yusuf Lab Section 1 Using different concentrations of sucrose affecting movement of water in and out of dialysis tube to find the concentration of an unknown solution Introduction This experiments attempts to find how different concentrations of sucrose affect the amount of osmosis that occurs in a dialysis tubing and finally to find concentration of the unknown sucrose solution. The dialysis tubing represents a cell with a semi permeable membrane therefore water with along with