same way? Solutions capable of conducting electricity‚ such as ionic compounds‚ are referred to as electrolytes. There are three major classifications
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The first step is to calibrate the colorimeter with0.20 M Fe(NO3)3and set the absorbance at 470 nm since it is known to keep an acidic solution throughout the entirety of the experiment. It was important to do this right at the beginning of the lab since the zeroed value of the acid was the calibration number for all of the other solutions. A total of seven solutions with different dilutions were used throughout the lab to conduct the equilibrium constant. The first step was adding 5 mL of 0.200 M
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1. The standard curve is a graph that shows a relationship between concentration and absorbance of a solution. A standard curve was experimentally created in this experiment using 10mL solutions of phenol red with concentrations 10µM‚ 7.5 µM‚ 5.0 µM and 2.5 µM then the absorbance of each sample was measured using a spectrophotometer. This generated curve with resulting average absorbances of 1.273nm‚ 1.0275nm‚ 0.585nm‚ 0.285nm and 0.124nm provided a means to determine the phenol red concentrations
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Case 9 Horniman Horticulture 1. The financial performance of a company can be determined by analyzing different financial ratios. The Horniman’s company financial performance looks strong and healthy if one looks at their 2005-projected financial summary net profit of 60.8 thousand dollars. Also they have a steady growth and increase from 2002 to 2004 in their revenue‚ profits and assets. In addition‚ Exhibit 2 demonstrates that all but one financial ratio supersede the benchmark for other horticultural
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from 0° - 100° C? 20 10 At 30° C‚ 90 g of sodium nitrate Is 0 20 30 40 50 60 70 80 90 100 Temperature (0 °C) dissolved in 100 g of water. Is this solution saturated ‚ unsaturated or supersaturated? tat r 6. A saturated-solution-of-potassium chlorate is formed from one hundred grams of water. If the saturated solution is cooled from 80° C to 50° C‚ how many grams of precipitate are formed? - -0 ’I 4-V I 7. What compound shows a decrease in solubility from 0° to 100°
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a 1.0 M (molarity) solution. Label a short stem pipet “DW” (distilled water)‚ which will be used throughout the experiments. Use the 25 mL graduated cylinder to measure 5 mL of distilled water and add that to test tube “a”. Dry the graduated cylinder and wash with distilled water after each step after this. Use the graduated cylinder to measure 1 mL of the 1.0 M sucrose solution and use the “DW” pipet to add 4 mL of distilled water to test tube “b”‚ which is now a .2 M solution. Then use the graduated
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concentration. The three types of concentrations are hypotonic‚ hypertonic‚ and isotonic. When in comparison to another solution‚ a hypertonic solution has a lower concentration‚ a hypertonic solution has a higher concentration‚ and an isotonic is when the two solutions have an equal concentration. The experiment tested the relationship between the concentration of an egg and solutions of different concentrations. The hypothesis is that an egg placed in distilled water will gain mass while an egg placed
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of maximum absorption‚ Amax of bromophenol blue. 2. To construct a standard concentration curve for bromophenol blue. 3. To determine the concentration of the unknown bromophenol blue solutions. 4. To determine the concentration of two different solutes‚ bromophenol blue and methyl orange‚ in a mixture. Material and method: Refer to practical manual page 7 Results: Part 1: Determination of Amax of bromophemol blue
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C hapter 2 IS MATTER AROUND US PURE How do we judge whether milk‚ ghee‚ butter‚ salt‚ spices‚ mineral water or juice that we buy from the market are pure? physical process of evaporation. However‚ sodium chloride is itself a substance and cannot be separated by physical process into its chemical constituents. Similarly‚ sugar is a substance because it contains only one kind of pure matter and its composition is the same throughout. Soft drink and soil are not single substances. Whatever the source
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two different solutions. Osmosis has a lot to do with this experiment and is the movement of water molecules from a higher concentration to a lower concentration. Osmosis only deals with water and is a type of diffusion. The difference between all three solutions is that in a hypertonic solution the cells fluid rushes out of the cell and causes it to shrivel. In a hypotonic solution water rushes into the cell and causes the cell to expand and eventually pop. In a isotonic solution water rushes in
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