The drug content in each formulation was determined by triturating 20 tablets and powder equivalent to average weight was added in 100 ml of 0.1N hydrochloric acid. The solution was filtered through a 0.45μ membrane filter‚ diluted suitably and the absorbance of resultant solution was measured spectrophotometricaly at 267 nm using 0.1N hydrochloric acid as blank.5 Determination of Swelling Index4 The swelling index of tablets was determined in 0.1N HCl (pH 1.2) at room temperature. The swollen weight
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equations to describe the chemical process taking place. Important note: There are a few physical processes on this sheet – You can’t write an equation for a physical process! 1) When lithium hydroxide pellets are added to a solution of sulfuric acid (dihydrogen sulfate)‚ lithium sulfate and water are formed. 2) When dirty water is boiled for purification purposes‚ the temperature is brought up to 1000 C for 15 minutes. 3) If a copper coil is placed into a solution of silver nitrate‚ silver
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ABSTRACT The effect of molecular weight on the rate of diffusion of substances is tested using two tests: the glass tube test and the agar-water gel test. In the glass tube test‚ two cotton balls were soaked in two different substances‚ one in hydrochloric acid (HCl) and the other one in ammonium hydroxide (NH4OH). The cotton balls were inserted into the two ends of the tube at the same time. After some time‚ a white smoke was observed to evolve nearer the cotton ball soaked in HCl. This indicated that
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Introduction – When sodium bicarbonate and citric acid mix in water they dissolve‚ the sodium bicarbonate reacts with the citric acid to form sodium citrate and carbon dioxide. The carbon dioxide then bubbles out as a gas‚ which makes the bath bomb break up‚ in this experiment 3 tests will be conducted in order to find the correct ratio of bicarbonate soda and citric acid to create the perfect bath bomb. Background information – The reaction rate is the speed
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I had no idea of what was going on. I went to my local clinic to make sure that nothing was seriously wrong. After‚ some tests a week or so later they found Hydrochloric acid‚ and formaldehyde residue. The doctors told me my lungs‚ eyes‚ and skin burnt because they were irritated. After‚ a few questions I found out that: Hydrochloric acid is corrosive to the eyes‚ skin‚ and mucous membranes. Short term exposure fitted my symptoms. They included: eye‚ nose‚ and repertory tract irritation. Also‚
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says it contains sodium hydrogen carbonate (sodium bicarbonate). How would you test this material for the presence of sodium bicarbonate? I would add hydrochloric acid (HCl) with carbon dioxide with NaHCO3‚ and it should bubble and form gas. B. You know what color phenolphthalein and bromothymol blue turn when testing an acid or a base. Use the empty pipet in the Auxiliary Supplies Bag to test several (at least 3) household items including household cleaning products with bromothymol
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 0620/01 October/November 2008 45 Minutes *6400528663* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the
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level and any changes in pH can result in them not functioning properly. To maintain these constant pH levels‚ buffer solutions are used. A buffer solution can resist change to small additions of acids or base’s. A good buffer will have components that act like a base‚ and components that act like an acid. Diffusion is random movement of molecules or other particles‚ resulting in even distribution of particles when no barriers are present (David Sadava‚ 2011). Diffusion always occurs from areas
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absorbed absorbed Physical and chemical ProPerties Did you observer any chemical changes in this experiment? Yes What evidence did you use to decide that something was a chemical change? I observed during the application of the hydrochloric acid to some of the substances bubbling‚ and smoking Give at least two examples of chemical changes you observed. green changed form blue to application of HCL to Mg smoking and bubbling and CuCO3 Classify the following properties of
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ACIDS‚ BASES AND SALTS 1. What are indicators? What are the different types of indicators? An indicator is a dye which changes colour when put into an acid or a base. The different kinds of indicators are- Natural indicators- Litmus is a natural indicator‚ litmus solution is a purple dye which is extracted from a plant called lichen. Litmus turns red in acidic solutions and blue in basic solutions. Other
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