Sodium chloride

Graph 4 demonstrates the correlation between the transmittance and concentration levels of KMnO4, in how as the levels of concentration increase, the transmittance decreases. The experiment during week 2 was very similar to week 1 except we used potassium phosphate instead of potassium permanganate. Table 3 demonstrates the effect of wavelength on T% and absorbance. The same equation used for Table 2 was used in Table 3 in order, to calculate the absorbance. The highest absorbance level was…

Comparing the Absorptivity of Two Sequestration Agents Macy Freireich* & Alekhya Geddan ABSTRACT In this experiment it was decided which sequestration agent, charcoal or magnetic bentonite clay, was more effective at absorbing the PAH model, Procion Red MX-5B. By way of spectrophotometry, the collected absorptivity and concentration values of each of the diluted samples of the Porcion Red MX-5B were graphed and evaluated in comparison to the measured absorptivity of the dye extracted from…

Table 1, shows the exact chemicals used to prepare silica solution, zinc acetate solution and zinc nitrate solution. For the zinc acetate, adding 2-propanol to the hydrated zinc acetate will result in a white solution with some precipitations of zinc acetate in the bottom of the beaker, then by adding 2.1 grams of diethanolamine, ratio is 1:1, the solution will be transparent; due to the effect of diethanolamine which increases the pH of the solution, make it basic. Dissolving zinc nitrate in…

Materials and Procedure The materials that were used were the following: 4.268 grams of zinc sulfate heptahydrate, 2.586 grams of calcium acetate monohydrate, Analytical balance, 220 milliliters of deionized water, stir stick, two 100 milliliter glass beakers, one 250 milliliter glass beaker, filter paper, ring stand, glass funnel, and an Erlenmeyer flask. All of the materials listed above were obtained or taken into consideration before experimentation began. A piece of weight paper was…

Discussion The findings in this lab show that the melting point of Alum is 92.5 degrees Celsius. During the first trial a temperature of 91.0 degrees Celsius was recorded, but during the second trial a temperature of 93.0 degrees Celsius was found. Averaging the two temperatures gives a total around 92.0. The literature melting point of Alum is said to be 92.5 degrees Celsius and the data from similar studies, such as, Chemistry 103: Synthesis of Alum, together show that the results from the…

The purpose of this lab was to identify the amount of salt needed in the water to “flink”, the point at which an object sinks or floats, the golf ball in a salt solution. Flinking occurs when the object is neither sinking or floating, it appears as if it is suspended in the middle of the solution. To flink an object, the object’s density has to have the same as the density of the solution that it is placed into. To achieve the same density of both the salt solution and golf ball, manipulation of…

Introduction: Leaf Disk float in water alone. When a solution consisting of a small amount of sodium bicarbonate is added to the water it causes the leaf disk to sink. As photosynthesis continues in the leaf disk it releases oxygen and causes the leaf disk to rise. While cellular respiration is occurring also the rate that the disk raise is an in implicit measurement of the net rate of photosynthesis. The independent variable in this lab is the solution and the light because it can be…

with a watch glass. The solution was stirred until the acetanilide was dissolved. The flask was brought to the hood and 7.0g of pyridinium tribromide was added and then stirred for about 30 minutes with a watch glass as a cover. While stirring, 10% sodium bisulfite was added in 1ml increments until the orange/red color disappeared or was less intense. After, the solution was cooled in an ice water bath. Once crystals formed, the solution was filtered using a funnel. The product was then…

1. Which analytical balance is the more accurate? Why? 2. Which piece of glassware is best at measuring the density of water? 3. What two aspects of the data set you cited in Question 1 define it as “best”? 4. What does “standard deviation” measure? 5. (a) Calculate the standard deviation of the data set you labeled as having the least random error in the first experiment with pure water. (b) Calculate the standard deviation of the data set you labeled as having the MOST random error in the…

It is important to note that the goal of this experiment was to find the pKa value of bromothymol blue, a pH indicator commonly used in titrations. [UNC, 2017] The pKa is where the number of moles of acid to conjugated base are equivalent. To find this, both Beer’s Law and spectroscopy were utilized in an attempt to make graphs to show just where this value occurred. According to Sigma-Aldrich, the pKa of bromothymol blue is approximately 7.10. [SIGMA, 2017] The final pKa found experimental was…