black cross drawn on it Sodium thiosulphate Hydrochloric acid 2 measuring cylinders one 10ml and one 25ml Stopwatch Prediction Using the particle collision theory‚ I predict that the less concentrated the acid the slower the cross will disappear. This is because in a more concentrated solution there will be more hydrochloric acid molecules‚ which means that there will be more collisions between the hydrochloric acid molecules and the sodium thiosulphate molecules. Preliminary Results
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weight or neutralization equivalent for the carboxylic acid can be obtained from the base. It is most important that you accurately weigh your sample of acid and titrate to a phenolphthalein (colorless to pink color) end point using an accurately known dilute solution of sodium hydroxide (0.1000 M). If your unknown is soluble in a greater than 50% ethanol/water mixture‚ then use bromothymol blue as the indicator to give a yellow to blue color change. Using an analytical balance‚ accurately weigh out approximately
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bladder. The bladder is storage for urine. Urine is excreted to the outside of the body through the urethra. Kidney The kidneys are two bean-shaped organs located outside the peritoneum at the posterior of the upper abdomen. The kidneys are located one on each side of the vertebral columns and are protected by the ribs and a layer of fat. The renal artery‚ renal vein and ureter connect to the kidney at the indented media border called the hilus. Besides Urine Formation‚ the kidney has the following
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Biography: Born at Pella‚ Macedonia in 356 B.C.E Father- King Phillip II mother- Olympias Age 13 he became student of Aristotle In 336 B.C.E Phillip was assassinated and at 20 years old Alexander took the throne The first engagement was against the Persians at the Granicus River‚ next western Asia Minor‚ then turned south moving along the Mediterranean coast; ran into resistance from island of Tyre. Alexander led a siege for 7 months‚ finally conquering Tyre in July 332 B.C.E; then moved
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Method 1- Titration • For the titration‚ it is necessary to dilute the Sodium Hydroxide so that it is an easier concentration to titrate. Using a 25cm3 pipette‚ washed out with some of the NaOH solution‚ transfer 25cm3 of the solution to a 250 cm3 volumetric flask‚ and fill to the line with distilled water. The alkali will now have a concentration of 0.1 mol dm-3. • In the titration‚ the NaOH will be in the burette‚ and will be titrated into HCl in a conical flask: NaOH (aq) + HCl (aq) NaCl
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Rayon is a manufactured regenerated cellulose fiber. Because it is produced from naturally occurring polymers‚ it is neither a truly synthetic fiber nor a natural fiber; it is a semi-synthetic[1] fiber. Rayon Fiber Characteristics o Highly absorbent o Soft and comfortable o Easy to dye o Drapes well Some Major Rayon Fiber Uses • Apparel: Accessories‚ blouses‚ dresses‚ jackets‚ lingerie‚ linings‚ millinery‚ slacks‚ sportshirts‚ sportswear‚ suits
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bromine solution with sodium bromide). Silver nitrate can be used to test for halides (Cl- = white precipitate‚ Br- = pale cream precipitate‚ I- = pale yellow precipitate) Ammonia solution is added to the precipitates. Further testing involves adding dilute
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refers to the titration of alkali with a standard acid and alkalimetry refers to the titration of an acid with a standard alkali. 123 Permanganimetry Titration: The titration involving KMnO4 is called permanganimetry titration. In presence of dilute H2SO4 KMnO4 oxidizes ferrous sulphate to ferric sulphate and oxidizes oxalic acid to CO2 and H2O. Normality: The strength of a solution is expressed in terms of normality. Normality is the number gram equivalent
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CASE 7: HYPERPARATHYROIDISM This is the case of a 53 year old violinist. Signs and Symptoms presented by the patient: * Pain that came in waves which started in his right flank and radiated into the groin * Bright red urine * Ureteral stones * Parathyroid adenoma Laboratory Findings: Patient’s Laboratory Values | Serum Ca2+ | 11.5 mg/dl (normal‚ 10mg/dl) | Serum phosphate | 2mg (normal‚ 3.5 mg/dl) | Serum parathyroid hormone | 125pg/ml (normal‚ 10-65 pg/dl) | Serum
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Experiment 3 Objectives Separation by Solvent Extraction To separate a mixture consisting of a carboxylic acid and a neutral compound by using solvent extraction techniques. Introduction Frequently‚ organic chemists must separate an organic compound from a mixture of compounds‚ often derived from natural sources or products of synthetic reactions. One technique used to separate the mixture compounds is called extraction. Extraction is a process
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