analyze the percent composition of a substance mixture by using double indicator titration. The analyte used is the soda ash which is titrated with an HCl titrant‚ standardized by 1o Na2CO3. The indicators used are phenolphthalein for basicity and methyl orange for acidity. The two volumes of the titrant are then used to calculate percent composition of soda ash analyte. Statistical parameters such as relative standard deviation and confidence limits are also calculated. At the end of the experiment
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References: Abdel Bar‚ F.M.‚ Khanfar‚ M.A.‚ Elnagar‚ A.Y.‚ Badria‚ F.A.‚ Zaghloul‚ A.M.‚ Ahmad‚ K.F.‚ . . . ‚ El Sayed‚ K.A. (2010). Design and pharmacophore modeling of biaryl methyl eugenol analogs as breast cancer invasion inhibitors. Bioorganic & Medicinal Chemistry‚ 18‚ 496–507. Aboutabl‚ E.A.‚ El Tohamy‚ S.F.‚ De Footer‚ H.L.‚ & De Buyck‚ L.F. (1991). A comparative study of the essential oils from three Melaleuca species
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For many‚ the answer to cleaning pallets is to fumigate the pallets with methyl bromide‚ a pesticide that has restricted use due to its toxic nature‚ or they may choose to heat-treat each pallet. Methyl bromide is not only an environmental toxin‚ but is also a known neurotoxin and carcinogen causing symptoms such as fatigue and acute memory loss. Heat treated pallets are of course free from methyl bromide and its’ less than desirable side effects but exposure to outside elements will
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buffer solutions giving the acid and base color that was used in identifying the pH range. The obtained result of each group is relatively close to the theoretical results. The outcome of this experiment shows that methyl orange‚ bromphenol blue and bromcresol green are all acidic while methyl red‚ bromothymol blue‚ bromocresol purple‚ thymol blue and phenolphthalein results to being basic. ------------------------------------------------- ------------------------------------------------- Introduction
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2.4.4. Toxicokinetics of MT: Both carbendazim and Methyl Thiophanate are classified as benzimidazole fungicides. Carbendazim is a major metabolite of benomyl with closely similar structural and toxicological characteristics. Methyl Thiophanate is also structurally related to both carbendazim and benomyl. Both benomyl and carbendazim are well absorbed after oral exposure (80–85%) but poorly absorbed after dermal exposure (1 or 2%) in rats‚ mice‚ dogs and hamsters. The major
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is required for prostaglandin and thromboxane synthesis. Aspirin acts as an acetylating agent where an acetyl group is covalently attached to a serine residue in the active site of the COX enzyme. The synthesis of aspirin is classified as an esterification reaction. Salicylic acid is treated with acetic anhydride‚ an acid derivative‚ causing a chemical reaction that turns salicylic acid’s hydroxyl group into an ester group (R-OH → R-OCOCH3). This process yields aspirin and acetic acid‚ which is
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to reduce calories per serving. | * Can negatively impact metabolism * Some have been linked to cancer‚ dizziness hallucinations and headaches. * May result in hyperactivity‚ angiodema‚ asthma‚ rhinitis‚ dermatitis‚ tumors and urticaria | Benzoate Preservatives(BHT‚ BHA‚ TBHQ) | * Compounds that preserve fats and prevent them from becoming rancid. | * Can affect estrogen balance and levels. | Brominated Vegetable Oil(BVO) | * Chemical that boosts flavor in many citric-based fruit
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through acid-base reaction‚ yields the salt that has the requirements to act as an emulsifying agent. Besides the above five basic ingredients‚ some hand creams also contain alcohols‚ such as propylene glycol (1‚2-propanediol)‚ and esters‚ such as methyl stearate‚ to provide the desired texture of the hand cream. In this experiment you will prepare four hand creams using the combination of ingredients as shown in Table 1. Table 1
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Bhopal UNION Carbide Tragedy‚ India In the early morning of December 3rd‚ 1984‚ over 40 tons of methyl isocyanate gas leaked from the UNION Carbide pesticide plant in Bhopal‚ India‚ the toxic cloud enveloping the surrounding population. The gas cleared at dawn‚ already having killed and injured many people. Four months after the release of this toxic pollution‚ over 3‚800 people had been reported dead to the Indian government and approximately 11‚000 with disabilities. Legal action and court settlements
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salicylic acid and acetic anhydride. In the reaction the hydroxyl group on the benzene ring in salicylic acid reacted with acetic anhydride to form an ester functional group. This method of forming acetylsalicylic acid is an esterification reaction. Since this esterification reaction is not spontaneous‚ sulfuric acid was used as a catalyst to initiate the reaction. After the reaction was complete some unreacted acetic anhydride and salicylic acid was still be present in the solution as well as some
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