items as acids and bases 4. Collect organise and analyse results in tables and graphs (if necessary) 5. Analyse results and explain the reason the substances have the pH obtained. Aim – To use a universal indicator to measure the pH of various household substances and to identify acidic‚ basic and neutral substance. Hypothesis: I hypothesise that food substances such as coke and vinegar will be acidic‚ whilst cleaning products such as detergent and diluted hydroxide acid will be basic
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inside barium sulphate‚ BaSO₄‚ using the method of gravimetric analysis. This quantitative determination is done by the addition of a dilute solution of barium chloride slowly to a hot unknown sulfate solution slightly acidified by concentrated hydrochloric acid‚ HCl. The white precipitate of barium sulphate is filtered off‚ washed with water‚ oven-dried‚ and weighed as barium sulphate. The quantitative amount of sulphate is deduced from mathematical calculations. The results of the experiment‚ however
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Sc Science test KEY STAGE 3 TIER 5–7 Paper 2 First name Last name School ________________________________________________ ________________________________________________ ________________________________________________ Remember 2009 I I I I I The test is 1 hour long. You will need: pen‚ pencil‚ rubber‚ ruler‚ protractor and calculator. The test starts with easier questions. Try to answer all of the questions. The number of marks available for each question is given below
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that is slightly soluble in water. Molar weight of 137.02g and has zero reactivity. Sodium Bromide- white‚ crystals‚ granules. Soluble in water with no reactivity. Molar weight of 102.89g. Sulfuric Acid- colorless liquid that is miscible in water and produces heat. Highly reactive and has molar weight of 98.08g. Sodium Bicarbonate- baking soda‚ white lumps that are soluble in water. Zero reactivity and has molar weight of 84.01g. Water- polar with molar weight of 18.02g Procedure: Weigh
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Name: __________________________________ ( ) Class: 4Q HWA CHONG INSTITUTION PRELIMINARY EXAMINATION 2010 CHEMISTRY 5072 Paper 1 Time: 1 hour INSTRUCTIONS TO CANDIDATES Do not turn the pages over until you are told to do so. Write your name and index number on the answer sheet in the spaces provided. There are forty questions on this paper. Attempt all questions. For each question‚ there are four possible answers labelled A‚ B‚ C and D. Choose the one you consider correct and
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which neutralizes stomach acidity. Antacids perform a neutralization reaction‚ increasing the pH to reduce acidity in the stomach. When gastric hydrochloric acid reaches the nerves in the gastrointestinal mucosa‚ they signal pain to the central nervous system. This happens when these nerves are exposed. Antacids are taken by mouth and work by neutralizing excess stomach acid. They contain ingredients such as aluminum hydroxide‚ calcium carbonate‚ magnesium hydroxide‚ and sodium bicarbonate‚ alone or in various
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Yuri Anthony D. Sucgang BMLS-IA Electrophoresis Machine Gel Electrophoresis Apparatus(Aragose Gel) Electrophoresis is the motion of dispersed particles relative to a fluid under the influence of a spatially uniform electric field. Gel electrophoresis is a laboratory procedure used to separate biological molecules with an electrical current. In this lesson‚ we’ll review how agarose gel electrophoresis works and introduce the equipment necessary to perform an electrophoresis experiment.
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Chemical Proced-ure or equipm-ent Risks Precautions to be taken Safety regulations Concentrated sulphuric acid Test tube and pipette Corrosive skin and toxic if swollen Wear goggles and gloves when In contact with this Keep locked up. Keep container dry. Do not ingest. Do not breathe gas/fumes/ vapour/spray. Never add water to this product. In case of insufficient ventilation‚ wear suitable respiratory equipment. If ingested‚ seek medical advice immediately and show The container or the
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Lab S: Acids and Bases: Titrations | Determining Equivalence Point and Molarity Susheel Palakurthi 11661148 Partners: Justin Mwakule‚ Andrew Farrell July 29‚ 2015 CHEM 123 L02 TA: Amelia Fitzsimmons Experiment conducted: July 22‚ 2015 Introduction Acids and bases is an important aspect in chemistry. A specific example of such is in the body‚ acids and bases have to be balanced in order to provide the optimal pH in the system for normal physiological processes. Anything digested by the body has
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free acidity is 20.83 N NaOH/ 100 ml sample while the total acidity is 20.0 N NaOH /100 ml sample. Lactic test was also performed in in relation with the gastric analysis. Addition of gastric juice to FeCl2 was done to determine the presence of lactic acid‚ in which a distinct canary yellow color gives a positive result for the test. The colors obtained were dark yellow (gastric juice) and pale yellow (FeCl3) which indicates a positive result. Though the values gathered were acceptable‚ errors were inevitable
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