... form. In the separatory step, m-nitroaniline was protonated to become a salt. In order to reverse this change, we added NaOH into the aqueous solution until the solution became basic (tested by using litmus paper). When NaOH is added to the solution, the OH- would deprotonate the m-nitroaniline salt and convert it back into m-nitroalinine. By making sure the pH was basic, we ensured that ... there was no more free protons left in the solution. The resulting solution consisted of m-nitroalinine dissolved in water, alongside various neutral ions. Next, we had to transfer m-nitroaniline fro...

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... to break down or neutralize any remaining impurities, increasing their solubility in the aqueous phase. The components of the solution which are miscible in water dissolve into an aqueous layer, while the immiscible components remain within the organic phase of the solution. Reflux is used to condensate the vapors from the solution for an extended time period, and when the immiscible components are inseparable from ... was heated to a gentle boil for 65 minutes. After the 65 minutes of cooking the mixture, the heat was removed and the solution was left to cool down. Then the mixture was...

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... more substances. The substance in the greater (greatest) quantity is called the solvent and the other component(s) is (are) called the solute(s). When water is the solvent, the solution is called an aqueous solution. In an aqueous solution, most of the water is in its molecular form, H2O. However, a small amount of the water will dissociate into ions - one hydrogen ion (H+) and one hydroxide ion ... (OH-) per molecule dissociated. The pH scale is used to measure the concentration of hydrogen ion in an aqueous solution. With pH measurements, the letter p indicates negative log and H indi...

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• Grade Level: High School

... definition of acids and bases, which supplanted both the earlier Bronsted-Lowry concept and the first definition--the Arrhenius model. Arrhenius first defined acids as proton (H) producers in aqueous solution and bases as hydroxide (OH) producers. Although this model is intuitively correct, it is limited to substances that include proton and hydroxide groups. Lewis gave us the ... better understand our physiology. TERMS Acid - A compound which yields hydrogen ions in solution. Arrhenius model - Arrhenius proposed that acids are substances that produce protons, H+, in aqueous solution, wh...

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... What are ion-dipole attractions and how are they involved in the process of solvation What does crystallization or precipitation mean? What is a supersaturated solution? How is this kind of solution made? What happens to the boiling point and freezing point of water when salt is added? How can you increase the rate at which ... is the solvent Types of Solutions Solid Solutions Alloys = How are alloys formed? Gaseous Solutions Liquid Solutions Miscible Immiscible: Example Aqueous Solutions Aqueous solution = water as solvent Electrolyte = substance that dissolves in water to form solutio...

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... . The three remaining experimental setups did not have any difference that can be seen with the naked eye. They all appear the same. The mouthwash-H20 solution was, in a way, effective but not that economical. A bottle of mouthwash (250mL) that has a price of Php 110.00 can be used ... of this investigatory project is to know whether we can use mouthwash as a hair rinse. A mouthwash is defined as a non-sterile aqueous solution used mostly for its deodorant, refreshing or antiseptic effect. Mouthwashes or rinses are designed to reduce oral bacteria, remove food particles, temporarily ... ...

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... was then added in a drop wise fashion in order to hydrolyze the solution and this is when the HCl fumes were released. After the (CH3)2SiCl2 was hydrolyzed the solution was separated into its ethereal and aqueous layers in a separatory funnel. The aqueous solution can be discarded and then a dilute sodium bicarbonate solution should be prepared. The dilute sodium bicarbonate was used to wash the ethereal ... solution and bring it to a neutral pH of 7. Once the solution was neutral a final wash should be performed with water ... ...

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• Grade Level: Undergraduate

... from bacterial leaching solutions by a process called Ligand Exchange extraction, metals such as Iron, Fe2+ and Fe3+ are left in the solution. "a compound which is a good ligand for copper ions is dissolved in an organic solvent- E.g. Kerosene, Kerosene is immiscible with ... reversed by mixing the organic solvent with a small amount of concentrated acid, this will push the copper ions back into the aqueous solution, However a mining industry have to decide how long they spend on leaching because if u leach for a long period of ... solution react with the sulphuric acid, Copper (ii) Carb...

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... and many are liquids or gases at room temperature. They are non-conductors of electricity in both the solid and liquid states and the aqueous solutions of some compounds are weak conductors of electricity however few compounds in aqueous solution are good conductors of electricity. Covalent molecular form solids that are generally quite soft are easily scratched and often have a waxy appearance. ... an electrical current cannot be carried. Covalent molecular acids are the exception. They form ions when they are dissolved in water which is able to conduct electricity (like an ionic soluti...

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• Grade Level: Undergraduate

... bond; a medium for chemical reactions, due to its properties as a solvent; the diffusion and osmosis of substances, e.g. gaseous exchange, which need to be moist as the exchange takes place in solution, therefore there is water in the lungs or in mesophyll cells (in plants) . It is also used on a much larger scale for transport. Blood is mostly water, and is used ... surrounds many internal organs to give protection and lubrication like the pleural fluid around the lungs, the pericardial fluid around the hear and the brain contains cerebro-spinal fluid. The aqueous and vitreous humours ...

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... bond; a medium for chemical reactions, due to its properties as a solvent; the diffusion and osmosis of substances, e.g. gaseous exchange, which need to be moist as the exchange takes place in solution, therefore there is water in the lungs or in mesophyll cells (in plants). It is also used on a much larger scale for transport. Blood is mostly water, and is used ... surrounds many internal organs to give protection and lubrication like the pleural fluid around the lungs, the pericardial fluid around the hear and the brain contains cerebro-spinal fluid. The aqueous and vitreous humours o...

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... to extracting the caffeine, also the run time could have been increased to optimise caffeine extraction. It was also noticed that when treating the solution with dichloromethane bubbling of the aqueous layer occurred. This could have caused the aqueous layer to remain in the organic layer. This would have affected the purity of the sample in the end and making the separation step ... non-polar C18 column. The calibration curve was also successful. However an error in the some data points caused a curve in the line. Inaccuracies in the making up of this solution may be attributed to this...

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... bioassay must be used for ideal results. The four basic screening bioassays as stated by the authors of the review article are aqueous extract screening, seedling screening, field screening, and chemical screening. Aqueous extract screening involves attempting to germinate seeds or grow plants of a receiver species in soil/solution that contains an extraction from the source species. Seedling screening is the same as ... aqueous extract screening except ground up donor plant parts or decomposing leaves are mixed into the growth medium. Seedling screening is also conducted only on previo...

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• Has Bibliography
• Grade Level: Undergraduate

... a patient or we may cause permanent damage to them. An example of that would be, say we have a neonatal nurse that is administering sodium chloride solution via IV to a neonate. If the nurse proceeds to give the neonate even .05cc too much then the neonate will probably not survive. We must ... of part of the American society. We so often want a "quick fix- to our life styles. Any thing that goes fast and is the easiest solution to a problem, we want. So this shows a lot of what we want, since it is an easy answer when we are low on energy. ... keeps our environment healthy as we excha...

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... apart into positive and negative ions when in water. According to Arrhenius, acids are substances that contain hydrogen and yield hydrogen ions in aqueous solution. Arrhenius also believes that bases contain the OH group and yield hydroxide ions in aqueous solution. Arrhenius began working with physical chemistry and was awarded a "traveling fellowship award" that allowed him to work with many famous chemists all around ... ...

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... able to move through selective permeable cellular membranes. They must regulate moving necessary materials in and out of the cell in order to maintain homeostasis. Because of a cell's aqueous environment, it allows water to pass by osmosis or aquaporins. With osmosis, water can move throughout the membranes of a cell, down its concentration gradient. Water moves from areas ... solute with a smaller volume to diffuse into. More solutes enter the cell with a larger surface area to volume ratio. Materials: - 2% agar containing NaOH and the pH-indicator dye phenolphthalein - 1% phenolphtha...

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... reactions in chemistry is the reaction of an acid with a base. This reaction is called neutralization. In this process an aqueous solution is the combination of hydronium ions with hydroxide ions to form water. The process of determining the concentration of ... was started by taking three Erlenmyer flasks and .4 to .6 grams of KHP was exactly weighed and added to the flasks. A. Standardization of Sodium Hydroxide solution Between 0.4 and 0.6 grams of KHP was weighed and added to three Erlenmyer flasks. The masses were then recorded and labeled. To each sample about 100 ... an acid in an...

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... the result accuracy of two decimal places can be obtained. It is a simple, reliable, and economical experiment that is simple to use. Reactions between aqueous solutions are generally fast. The endpoint is when the indicator suddenly changes colour, this means the reaction is complete. At the endpoint you stop the ... HCL used 0.0209 mol 0.0209 mol 0.0209 mol Concentration of HCL 1.045 mol/L 1.045 mol/L 1.045 mol/L 2. Obtain about 120 mL of hydrochloric acid solution in a 250 mL beaker. Label the beaker. Rinse a buret with about 10 mL of the sloution, and let the liquid drain through the...

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... , NH4OH (aq), are mixed the following reaction occurs. H2SO4 + 2 NH4OH (NH4)2SO4 + 2 HOH When a 1-to-1 mole ratio occurs, both the properties of the acids and bases disappear and the resulting solution becomes neutral, a pH of 7. A Bronsted-Lowry acid is defined as a species that donates a proton (H+) and a Bronsted-Lowry base is defined as a species that accepts a proton. Conjugate acids and conjugate bases ... + log [base/acid] If there are equal moles of weak acid and the base, NaOH at the half-equivalency point during this lab, then the pKa is equal to the solution's pH value. The ha...

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... gas will escape and cause the analytical results to be low. None the less if this photochemical decomposition happens in the presence of excess Silver ions in an aqueous solution the following additional reaction occurs: 3Cl2(g) + 3H20(l) + 5Ag+(aq) ï‚® 5AgCl(s) + CIO3-(aq) + 6H+(aq) If the above ... the quantity of the precipitate; generating a systematic error in the analysis, this is because there is a probability of presence of anions in the solution which will cause the analytical results to be overstated as they will form along with the Silver chloride salt and will be collecte...

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... ionic compounds are: all ionic compounds form crystals, it has a high boiling and melting point, it is hard and brittle, and it conducts electricity when it is dissolved in an aqueous solution. Crystals are formed because the negative and positive charges come together tightly, or stuck, and they stack into groups. Together, they form a distinct crystal shape. High melting and boiling points ... to move, or distort. Since the molecules don't align into patterns, they are not crystal shaped. The compound breaks into neutral molecules when they are dissolved in water. Therefore, forming a...

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Acids and bases are compounds that, when added to an aqueous solution, change the amounts of H3O+ and OH- ions in solution. Acids increase the amount of H3O+ in solution by donating protons (H+) to water (H2O), forming H3O+. Bases increase the amount of OH- by removing protons from water, forming OH-. Acidic solutions have more H3O+ than OH- in them, ... - ions floating around due to auto ionization of water that constantly takes place, and no matter how basic you make a solution, there is still some H3O+ present in that solution. A solution containing H3O+ can be basic, because there are mo...

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... the filtering device with the water that does. After digestion is finished, the solution is filtered; in this experiment filter paper was used. Then deionized water or dilute acids are used to wash the precipitate to ensure that all aqueous ions are removed from the surface of the precipitate. The precipitate is then dried ... an uncertainty of .002g. The filter paper was wetted with deionized water to make sure that it touched all sides of the funnel. The precipitate and solution were filtered through the paper so that all of the BaSO4 was left on the filter paper. This was then left t...

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... (l) à Na1+ (aq) + OH1- (aq) NH4OH (aq) ß -> NH41+ (aq) + OH1- (aq) double arrow indicates ionization of weak base ammonium hydroxide Thus bases are defined as substances that release hydroxide ions in solution. It is these OH1- (aq) ions that are responsible for the properties of bases. How Bases are Prepared: Bases may be prepared by the reaction of water and very reactive ... to form hydrogen and hydroxide ions (remember that water is a weak electrolyte): Na2CO3 (s) à 2 Na1+ (aq) + CO32- (aq) HOH à H1+ (aq) + OH1- (aq) 2) Thus, the following particles may be present in a sol...

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... from the center of a cell to its surface almost as fast. There are two types of diffusion across the membrane barrier: OSMOSIS: It depends on concentration of solutes in an aqueous solution on the two sides seperated by a membrane. Solute concentration is related to osmotic pressure. Greater the solute concentration, greater the osmotic pressure, and greater the tendency to absorb water. Hyperosmotic ... Solution (hypertonic): A solution with a higher concentration of solutes. Hypoosmotic Solution (hypotonic): The solution with lower solute concentration. Isosmotic Solution (isotonic): ...

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• Grade Level: Undergraduate