16-3 Red Cabbage Juice pH Indicator Sources: Prof. George Ewing’s C100 Demonstration Notes; Prof. Carolyn Huffman’s Fall ’93 C100 lecture; B. Z. Shakhashiri‚ 1989‚ Chemical Demonstrations: A Handbook for Teachers of Chemistry‚ vol. 3‚ pp 162-166. Description and Concept: Red cabbage juice will change to a variety of colors when added to solutions of various pH. Red cabbage juice is a pH indicator. Materials: red cabbage* blender hot or boiling water filter paper (coffee filters
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the relationship between enzymatic reaction affected by temperature and pH. Through the testing the enzyme at different temperatures‚ and different pH levels; it would determine at which temperature and pH level the enzyme worked the most efficiently. Analyzing absorbance of the solutions with spectrophotometery will determine the reaction rate. To test the optimal pH‚ the starch and a buffer were combined at a specific pH level and tested the absorbance of a solution at various times. To resolve
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Abstract The abstract‚ although it comes first logistically‚ always should be written last. It needs to be written last because it is the essence of your report‚ drawing information from all of the other sections of the report. It explains why the experiment was performed and what conclusions were drawn from the results obtained. A general guideline for an abstract has five sections or areas of focus: why the experiment was conducted; the problem being addressed; what methods were used to solve
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The Effect of pH on the Rate of Osmosis Using a Glucose Solution Melissa Werderitch Biology 157 11/6/06 Introduction In a journal article written by Florian Lang‚ osmosis is essentially explained as the flow of water from one area to another that are separated by a selectively permeable membrane to equalize concentrations of particles in the two locations (Lang‚ 1997). Osmosis is able to maintain osmotic pressure and regulate a cell’s volume. In a hypotonic () or hypertonic () environment
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INTRODUCTION Apples contain an enzyme called polyphenol oxidase (Phenolase). Phenolase has catecholase and cresolse activity‚ also containing small traces of copper. When apples are cut‚ phenolase is released from the cells and is exposed to oxygen. When phenolase reacts with oxygen‚ it catalyses one step of the biochemical conversion of phenolic compounds. The presence of oxygen hyrdroxylates the colourless phenols‚ which are subsequently oxidised to coloured quinones known as melanin. (Vlasta
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Chung Blanche Ely High School Abstract The researcher conducted this experiment in order to investigate how various factors effected enzymes. Those factors were the concentration of the enzyme‚ the temperature it had to work in‚ and the pH level of the solutions as well. All three were hypothesized to speed up the rate at which the enzyme acted. A series of several tests were carried out to find the answer to each problem. First‚ the scientist witnessed the enzyme diastase work in a natural
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pH and Chromatography Lab Report Kevin Rivera Biology Mr. Langley 2C 10/7/13 Introduction In this lab‚ of pH and Chromatography‚ in the pH aspect of the lab we are trying to figure out the pH level of certain chemicals by writing down of known solutions to find the type of unkown solution using pH standards. In the Chromatography‚ we are trying to separate the chemicals using water and a piece of paper. Methodology Materials: Safety Goggles pH indicator & pH indicator key
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Paul M. Nannery 4006529 Respiratory Acidosis and Alkalosis Activity 1: Normal Breathing 1. At 20 seconds‚ pH = 7.39 2. At 40 seconds‚ pH = 7.39 3. At 60 seconds‚ pH = 7.39 4. Did the pH level of the blood change at all during normal breathing? If so‚ how? The PH level did not change at all. 5. Was the pH level always within the “normal” range for the human body? The PH Level was always within the normal level 6. Did the PCO2 level change during the course of normal breathing? If
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Why farmers sometimes need to change the pH of soil A healthy‚ productive farm is created from the ground up. The fertility‚ structure and biological activity of your soil are the keys to raising successful crops. Great soil grows great plants with increased vigour and pest tolerance‚ not to mention maximized yields. There’s a lot to know about your soil for sure‚ but the most critical measurement is its pH. What is pH? Represented on a scale of 0 to 14‚ pH is the measurement of the acidity of something—in
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Strength Calcium Antacid Tablet • Goggles • Thymol Blue • Mortar and Pestle • Beakers • pH probe • Clamp • Retort Stand • Pipette-Graduated • Hydrochloric Acid(HCl) • Distilled Water • pH 4 solution Procedure- 1. All the materials were gathered/assembled. 2. The clamp was secured onto the Retort stand‚ 3. The pH probe was then attached to the clamp and secured tightly 4. With the pH 4 solution‚ the pH probe was calibrated properly according to SNC2D0 standards 5. One antacid tablet was
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