12-STANDARDIZATION OF SODIUM HYDROXIDE Standard solutions for titrations are especially pure mixtures with exactly known concentrations. Primary standards are very pure solids. They have the advantage that they can be weighed (the analytical balance is normally the most accurate instrument in the laboratory) and they are stable under laboratory conditions. In this experiment‚ the primary standard is oxalic acid dihydrate‚ H2C2O4 ( 2H2O. It will be used to standardize a solution of sodium hydroxide
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buffer solution was added. At station 1 the control two drops of ATP were added to each Petri dish. The control Petri dish was left alone and a pipette was used to deliver several drops of acetic acid to the experimental dish. Several drops of sodium hydroxide were added to the experimental dish. Results were observed and recorded. At station 2 the control Petri dish was left alone on the table
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Purpose: To find out the densities and to find out the name of the unknown metals. (Based on the extensive and intensive properties) Check up the words mass‚ volume‚ density‚ extensive properties‚ and intensive properties. Where do the units for mass and volume) come from and what do they mean? What is the density of distilled water? What is Archimedes principle? Does temperature affect the density of a solid? Liquid? Gas? Materials: Safety glasses‚ 10‚ 25 or 50 mL graduated cylinders
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et al Abstract: The purpose of this lab was to determine how light affected photosynthesis‚ specifically the production of O2 bubbles. It was predicted that when the light was more intense the O2 bubble production will be high. Conversely‚ when the light was less intense the O2 bubble production will be lower. Basically the plant that is closer to the light will produce more bubbles than the plant that is placed farther away from the light source. In this lab the independent variable is the light
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To what extent does varying the Sodium Chloride concentration impact the mass change of Solanum tuberosum cubes? Katie Hynek 12/11/15 Personal Engagement: Every Thanksgiving my aunt and grandma switch off making mashed potatoes and every year they use the same recipe. This year it was my aunt’s turn and when we went to eat the mashed potatoes they were super salty. After thanksgiving dinner that year I became interested in figuring out how the using the same recipes the outcome could be so different
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ab reportChemistry 117L Laboratory Report Name: Aneesa Noorani Lab Day: Tuesday Lab Room: SCL 114 Date of Experiment: January 22‚ 2013 TA: Mikhail 1. Basic Laboratory Skills Purpose(s) of the Experiment: The purpose of the first part of today’s experiment is to establish the stoichiometry of the reaction between titrate oxalate (C2O42-) and permanganate (MnO4-). The purpose of the second part of today’s experiment is to learn about the concepts of the rate of chemical reactions
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Typical soft drinks usually contain carbonated water‚ caffeine‚ sodium benzoate‚ flavoring agents‚ and sweeteners as well for the purpose for enhancing flavor‚ and in the case of benzoate‚ to function as a preservative. Caffeine is one of the major components that is found in several beverages like coffee‚ energy drinks‚ tea‚ and soft drinks; just to name a few. Caffeine is known to be a powerful drug‚ which many people become dependent on; when they wake up in the morning it is typical to have a
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Biology 101 Popcorn experiment Lab partners Robert Barham Michelle hall Diva Mancada Kelley Pritt 1 Introduction Popcorn‚ or popping corn‚ is a type of corn which explodes from a kernel and puffs up when heated. It is a popular snack food‚ especially in movie theaters. Popcorn can be salted or sweetened. Air popped popcorn is naturally high in fiber‚ low in calories and fat‚ contains no sodium and is sugar free. This can make it an attractive snack for people with caloric or
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statistically significant at a 99.8% confidence level. This means that there is a 0.1956% chance that the differences in velocity between the inhibited and uninhibited reactions are due to random chance. Based on these results it can be concluded that the sodium cyanide inhibitor reduces the reaction rate of enzyme-catalyzed reactions. The Vmax for the inhibited reaction was 1.208 mL/s and the uninhibited reaction was 2.41 mL/s. The Km for the inhibited reaction was 6.8611M and the Km for the uninhibited
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SCH 3U0 May 7th 2013 Percent Yield of Calcium Carbonate Introduction: The purpose of this experiment is to examine the percent yield of a precipitate in a double displacement reaction. A solution of calcium citrate and sodium carbonate were mixed together‚ then the products were filtered out as so only the precipitate remained. The filtered paper was then dried and the mass of the precipitate in the experiment divided by the theoretical mass of the precipitate from the calculated gave the
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