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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Investigation Investigate the amount of heat evolved when magnesium reacts with dilute acids. Planning What I am going to do I am going to find out how much heat is given out when magnesium reacts with a variety of dilute acids. In order to make comparisons between the acids‚ I shall use my results to work out how much heat would be given out if 1 mole of magnesium reacted with an excess of each acid. The acids I shall use are hydrochloric acid‚ sulphuric acid‚ nitric acid and ethanoic acid
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Buffers CALCULATIONS Table A. pH Measurement using pH meter Calculated pH Solution 1 – HoAc 0.10 M CH3COOH CH3COOH + H2O ⇌ CH3COO- + H3O+ i 0.10 ø ø c -x +x +x e 0.10 – x x x Ka = H3O+[CH3COO-]CH3COOH = x20.10 – x = 1.8 x 10-5 x = 1.33 x 10-3 M pH = -log [1.33 x 10-3] pH = 2.88 Solution 2 – HoAc – OAc
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2.6.6. Levels of total ammonia nitrogen‚ nitrite‚ nitrate and phosphate in the water samples The mean TAN levels in the present study in all the sampling stations were below the recommended level of 0.1 to 1.0 mg/L prescribed by Boyd (1990). However‚ when the level recommended (< 0.2 mg/L) by Chavez (2009) is taken as a standard‚ it was found to that 35% of the study period‚ TAN levels were above the acceptable limit in the feeder canal and the pond 3. Ferreira et al. (2011) has recommended 0
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Evaluation of gel A. pH: The pH of the various gel formulations was determined by using digital pH meter. B. Appearance: -The prepared gel bases were inspected visually for clarity‚ colour and presence of any particles. C. Homogeneity: All developed gels were tested for homogeneity by visual inspection after the gels have been set in the container. They were tested for their appearance and presence of any aggregates. D. Skin irritation test: Test for irritation was performed on human volunteers.
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1_____2_____3_____4_____5_____6_____7_____8_____9_____TOTAL________ CHEM 237‚ FALL 2007 HOUR EXAM 1 Name________________________________________________________ TA Name _______________________ __& Section # _________________ Student #______________________________________________________ 1. (9 pts) Write a valid Lewis structure for each of the following. Show lone pairs and formal charges where necessary. Draw covalent bonds as lines. (a) bisulfate ion‚ HSO4- O HO S O (b) hydrogen cyanide
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Introduction Acid rain refers to a phenomenon in which "[precipitation] from the atmosphere [contains] higher than normal amounts of nitric and sulfuric acids". The precipitation that results in acid rain comes from the pollution emitted by human activities‚ such as factories‚ electrical power plants and automobiles. Two main pollutants are sulfur dioxide (SO2) and nitrogen dioxide (NO2)‚ which reacts with substances in the atmosphere‚ such as water and oxygen‚ to form acid rain. While rain water
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Lab on pH Levels Purpose: Throughout this experiment we are trying to learn how to take proper pH measurements using a pH meter. We also want to see the pH of different common liquids and record the change in pH when we add acids and alkaline liquids. The last reason we are conducting this experiment is to explain and show how fresh milk spoils by the change in pH. Materials: In this experiment we used graduated cylinders and glass beakers and added variety of ingredients including 50 mL of; soda
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Objective The objective of this lab is to determine the pH level of common household products. Introduction Liquids are either acidic‚ basic‚ or neutral. We are able to figure out which one it is based on properties‚ along with the pH. Acids taste sour‚ and bases taste bitter. Using the pH scale‚ you are able to know how strong of an acid or base a liquid is. High concentration of [H+] ions means that the liquid has a low pH. Therefore a liquid with a low concentration of [H+] would have a high
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ASSIGMNET 1 | Research on student difficulties in Understanding Chemical reactions | Misconceptions on Strength of Acids and Bases | | Mariyam Zaina‚ 015482 | | | TITLE & INTRODUCTION Title: Misconceptions on Strength of Acids and Bases Researches shows that students often develops new theories about how the natural world works‚ prior to formal science education and frequently those theories are different to those of scientists(Demircioğlu et al.‚ 2005). Students develop
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