detection at a carbon fiber microdisk electrode(CFE) was developed for the determination of nicotine. Effects of detection potential‚ concentration and pH value of the phosphate buffer‚ and injection time as well as separation voltage were investigated. Under the optimized conditions: a detection potential of 1.20 V‚ 40 mmol/L phosphate buffer(pH 2.0)‚ a sample injection time of 10 s at 10 kV and a separation voltage of 16 kV‚ the linear range obtained was from 5.0×10–7 mol/L to 1.0×10–4 mol/L with
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Chemistry Coursework – Titration Background Science A titration is the neutralisation of an acid or an alkali. To achieve this‚ one must be added to the other in a specific amount‚ strength and concentration. A substance is neutral when its pH is 7. It is most acidic closer to 0 and is most alkaline closer to 14. 28492453194050 0 7 14 595423979670
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In this lab‚ the pH of flat sprite and a fresh sprite are compared two ways: one way was to record the pH directly with a digital pH probe and the other was to calculate the concentration through titration. Because the reaction is a neutralization reaction‚ the concentration of can be calculated if the concentration of is known. At the end of the titration‚ the moles of will equal the moles of and the pH is expected to be greater than 7 because the found in sprite is weak and is a strong
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experiments to measure the activity of the enzyme horseradish peroxidase under varied conditions. The first of which measured the effects of altered pH levels‚ while the goal of the second was to examine the effects of varied temperatures. To test the effects of pH on horseradish peroxidase‚ we began by zeroing a Spec 20 with 5.0mL of substrate (25mM guiacol) at pH 6.5. Once the Spec 20 was accurately zeroed‚ we added 100μL of the enzyme to this tube. The initial concentration of our enzyme throughout
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Na2CO3 and NaHCO3 present in the sample was determined at the end of the experiment. Introduction Soda Ash (Na2CO3) or sodium carbonate is commonly used as a cleaning agent and known as “washing soda”. It was found to be alkali and has a high pH in concentrated solutions. It is soluble in water but its solubility decreases slightly as the temperature increases above 35.4○C or 95.7○F. It is used in many different fields such as manufacturing‚ at home or in industries. It can be produced either
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information and instructions in the “Question” column. 7. Answer questions 1-9 on the Enzyme Controlled Reactions Worksheet. 8. Follow the instructions in the “Question” column to complete the virtual lab. You must test each lactose sample at all pH levels: 3‚5‚7‚9‚ and 11. Record your data in Table 1 on the Lab Worksheet. 9. Answer the question in the Lab Worksheet. Virtual Lab: Enzyme Controlled Reactions Worksheet 1. Which of the following does NOT apply to an enzyme: B. a. Catalyst b
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Lab Report: How Do Different pH Levels Affect The Growth of Plants Introduction: Plant growth is affected by various environmental factors‚ and pH is one of those. The pH of soil and the water that plants receive can have an impact on whether they obtain nutrients or not. Ph impacts the chemical reactions that take place within a plant‚ if the pH of the soil or water that the plant receives is too low (acidic)‚the nutrients that the plant requires may become extremely soluble to the point where
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Cell Structure and Function: Tonicity and pH Justin HeshizerBIOL 1107K (80561) 50 Experiment Number 5 10/02/14 Margaret E. Vorndam‚ M.S. Version 42-0038-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a
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ACIDS AND BASES The reason that acid-base reactions are so important is that many of the things you come into contact with on a daily basis are either acids or bases. Most fruits are acids‚ as are carbonated beverages‚ tea‚ and battery acid. Common household bases include baking soda‚ ammonia‚ soap‚ and antacids. What are acids and bases? There are not one but three common definitions used to describe acids and bases: 1. Arrhenius acids and bases 2. Brønsted-Lowry acids and bases 3. Lewis acids
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measure pH‚ which is safe for the environment and biodegradable to promote conservation of resources. One head of red cabbage can produce over two litres of indicator‚ and its growth period is approximately six to seven months‚ which is ideal for factorial production conditions. In the future‚ commercialized indicators may incorporate more naturally-occurring substances such as red cabbage or like plants such as petunias or onions. Biochemistry would merge with pH for a future in laboratorial pH indicator
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