Aqueous Solutions Reactions‚ Metathesis (Double Replacement) Reactions and Net Ionic Equations Terrance Shelton Introduction India’s cultural treasure and biggest tourist attraction is slowly losing its magnificent appeal due to decades of acid rain. The walls of the Taj Muhal are composed of a marble-like substance ( CaCO3) that corrodes and eventually crumbles when reacted with acid rain(H2SO4). Not only is the Taj Muhal suffering‚ but also other historic landmarks across the world. This is
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Titration test Alfredo Verzo III We have been provided with two samples of vinegar‚ one removed from a restaurant and one removed from a take-away. Trading Standards suspect these two establishments of watering down the vinegar. They need evidence that the samples contain less acid than the standard vinegar sample provided. What is the purpose of this? I’m a worker in the Trading Standards which carries out tests to see if restaurants and takeaways are watering down the vinegar. We will
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baking soda potato was faster than the lemon juiced but also slower than the raw. Our data shows that acids and bases do affect the timing of the chemical reaction. Our data does not support our hypothesis. We thought the acid was going to cause a quicker reaction than the raw potato but the complete opposite occurred. These results occurred because the acid in the lemon juice and the base in the baking soda altered how long it would take until a reaction occurs. There are a handful of human errors
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Acid/Base Titrations Pre- Lab Questions 1. Using your textbook or a handbook‚ look up the formula and structure of potassium hydrogen phthalate (KHP) used to standardize the solution of NaOH in this experiment. Calculate the Molar Mass of KHP. Molar Mass= 204.22 g/mol Formula: KC8H5O4 2. Using your textbook or chemical dictionary‚ write the definition of indicator. Indicator- a substance added at the beginning of the titration that changes color at (or very near) the equivalence
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then the protein will have a negative charge and if pH < pI‚ the protein will have a positive charge. Buffer I has a pH >5‚ meaning both proteins carry a negative charge and bind to the DEAE (a positively charged resin). (b) pH = pKa + log10(Base/Acid) [Base = mM of sodium acetate; Acid = mM of acetic acid] = 4.7 + log10 (40/40) = 4.7 In order for the catalase to elute from the column‚ it must have lost its negative charge and stopped binding to the DEAE. Lowering the pH nullifies the
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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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Red indicator in acid and alkaline conditions. These colours were then used to determine the end point of each titre. In the experiment 0.100M HCl (acid) was added‚ from a burette‚ to a solution of 25cm3 of NaOH (base) and several drops of Phenol red indicator. This was done until the base had been neutralised (signified by a colour change from pink to yellow). A magnetic stirrer was used to ensure even mixing of the acid being added. Problems:
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Determining the percent Concentration of a given Solution using Titration Morphy Kuffour Mrs. Langlis‚ AP Chemistry C-D 9/24/2017 Purpose: Determining the precise concentration of vinegar through titration using a standard solution of Potassium Hydroxide (KOH) (aq) Background: Vinegar is a solution of acetic acid (CH3COOH) in water. The concentration of acetic acid in Vinegar is written as a Molarity (mol/L). In this experiment‚ titration is used to determine the concentration of acetic acid in
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same way in previous part. The titration is repeated twice for both parts to get accurate readings. Average molarity of acetic acid is 1.0147 M. Average percent by mass of acetic acid in vinegar is 6.15 %. 1.2 Introduction In this experiment‚ acid-base titrations are carried out to
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because salt contains Na ions which attaches tothe allosteric site changing the shape of the enzyme to fit a substrate. Materials: • Peroxidase (enzyme in potato) • Hydrogen peroxide‚ 3% • A strong acid‚ pH3 (lemon juice‚ or HCL) 0.5 • A strong base‚ pH 10 (drain cleaner‚ NaOH) 0.5 mol/L • A weak acid‚ pH 6 (vinegar‚ acetic acid( CH3COOH)) 0.5
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