Acids & Bases: Reactions‚ Standardizations‚ & Titrations Experiments 21 & 22 Experimental Overview: The procedure for this experiment was carried out as instructed in the laboratory manual‚ Experiments in General Chemistry‚ 4th ed.‚ S.L. Murov‚ Experiment 21‚ Acids and Bases: Reactions and Standardizations‚ and Experiment 22‚ Acids and Bases: Analysis. There were modifications made by the instructor to dilute the 6M NaOH to 0.1M in 300mls
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weigh out 6 15.0g (15.0ml) samples of a 3% H2O2 (l) solution in test tubes. Using the same scale as before‚ weigh out 3 3.0g samples of baking soda on parchment paper and 3 3.0g samples of vinegar in 3 beakers. Mix the 3 samples of Baking soda with 3 of the samples of H2O2 (l) and mix the 3 samples of vinegar with the other sample of baking soda. Put rubber stoppers on the test tubes and mix/stir all 6 solutions. Be cautious of the Baking soda solution as they may produce CO2 (g) when shaken so
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Exothermic reactions give off heat‚ for example‚ fireworks. Endothermic reactions absorb heat; heating water on a stove thus the water turns into gas. Prediction/Hypothesis: If water is combined with ice or salt then it absorbs energy. If white vinegar is combined with baking soda or steel wool‚ then it gives off energy. If hydrogen peroxide is combined with dry yeast‚ then it absorbs energy.
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Analysis of Vinegar Solution | Sample 1 | Sample 2 | Sample 3 | Quantity of Vinegar taken | 5.00 mL | 4.95 mL | 5.10 mL | Initial NaOH buret reading | 4.00 mL | 0.00 mL | 1.55 mL | Final NaOH buret reading | 47.5 mL | 41.00 mL | 47.40 mL | Volume NaOH used | 43.50 mL | 41.00 mL | 45.85 mL | Molarity of Vinegar | .831 M | .791 M | .859 M | Mean molarity of Vinegar and average deviation | .827 M | % by mass acetic acid present | 4.96% | Questions: 1. Commercial vinegar is generally
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The bone sample has been soaking in vinegar with a pH of about 3.0 for a little over a week. The exterior of the bone remained intact the entire time. Once I removed the bone‚ I realized that the interior integrity of the bone was compromised. Now that the bone was exposed to the acid for such a long period of time‚ it was more flexible. The reason the long bone became so bendable is because the bone is largely made up of calcium salts. The vinegar broke the calcium phosphate down‚ leaving only collagen
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Amanda Ayers 09/07/2013 Title: Observations of Chemical Changes Purpose: To observe some properties of chemical reactions and associate them with everyday household cleaning products. Procedure: In order to complete this experiment‚ I had to set up and organize my lab table. I used my 24-well plate‚ my 96-well plate‚ and the first experiment bag which included all of the necessary chemicals. I also had to gather 3 household cleaning products and a pipet in order to test them as well
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simple chemical tests‚ such as solubility‚ pH‚ or color tests. In our group we had to test come common powders such as Alka-Seltzer‚ baking soda‚ flour‚ Vitamin C (ascorbic acid)‚ and salt. Other chemicals that were used to do this experiment were vinegar‚ and Iodine 2 Solution. The equipment used to do this experiment was red litmus paper‚ and 5 test tubes per group. After all materials were gathered‚ we then had to do five different tests to determine what the powder material does. The first
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oxygen around the combustion will remain and we heat and light. By analyzing the gas ready to prove our hypothesis which is the chemical reaction between baking soda (a base) and vinegar (weak acid) is carbon dioxide. As is heavier than air‚ facing the match expels oxygen. Without oxygen the flame goes out. When you mix baking soda and vinegar becomes an effervescence that seems fun during this reaction shows carbon dioxide‚ carbon dioxide is formed by a molecule of carbon and two oxygen and is in our lungs expel air when breathe in all
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heat energy is still energy. 5. Over time crusty scales form on the heating coil inside a kettle. These can be removed by covering it with vinegar. As the scales disappear‚ bubbles of gas are observed. Is this a chemical change or a physical change? Using vinegar to take off crusty scales is an example of a chemical change. This is because when using vinegar a new substance is formed. In this case the new substance is a gas. Another reason why we know that it is a chemical change is because bubbles
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HOW TO MAKE GLUE FROM MILK A Scientific Investigatory Project In Partial Fulfillment Of the Requirements in Science III Presented to Mrs. Dorotea Acuzar Researchers Caringal‚ Joshua A. Panopio‚ Michaela Divine V. Caguete‚ Perlie Flor A. December 2013 CHAPTER I INTRODUCTION During the ancient times‚ people were using either gums from plants or boiled-down bones and hides of animals as their adhesives or glues. These glues needed such a long time to dry and
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