will test this by seeing how much drops of hydrochloric acid (HCl) are required to neutralize a certain amount of the antacid. Antacids are used to resist heartburn. We sometimes use them to treat this because antacids are a mild base that can neutralize acids in our stomachs‚ such as HCl. The purpose of this lab is to see how well each antacid neutralize hydrochloric acid. Procedure: 1. Obtain two burets‚ one for use with the HCl and others for use with the NaOH. 2. Record the exact molarity
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enzyme is responsible for hydrolyzing starch. In the presence of amylase‚ a sample of starch will be hydrolyzed to shorter polysaccharides‚ dextrins‚ maltose‚ and glucose. The extent of the hydrolysis depends on how long it is allowed to react – if the starch is hydrolyzed completely‚ the resulting product is glucose. You will test for the presence or absence of starch in the solutions using iodine (I2). Iodine forms a blue to black complex with starch‚ but does not react with glucose. If iodine
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protection against bacteria. Betaine helps to maintain a fluid balance inside the mouth. The lists of digestive enzymes secreted by the oral cavity are mentioned in the table. Enzymes | Function | Ptyalin | Converts starch to simple soluble sugars | Amylase | Converts starch to soluble sugars | Betaine | Maintains cell fluid balance as osmolytes | Bromelain | Anti-inflammatory agent‚ tenderizes meat | Stomach -the enzymes released by the stomach are known as gastric enzymes. They are
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the color. Experiment 2: Starch Test 1. Fill in the table below with the results from the starch test experiment. Results Starch Test Solution Initial Color Color with Iodine Solution starch solution clear purple water clear green 1. Iodine solution is added to a chocolate chip cookie solution. The color changes to purple. Based on this result‚ what biological molecules are present in the chocolate chip cookie solution? Starch 1. What is the relationship
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acetate 5 (aq) = black ppt 5. Nitrite: Pungent light brown gas 1. Starch-iodide test: WE + dil H2SO4 (or dil acetic acid); boil‚ then add solid KI + fresh starch sol = deep blue colouration Group II (conc H2SO4 group) – Cl(chloride)‚ Br- (bromide)‚ I- (iodide)‚ NO3- (nitrate)‚ CH3COO- (acetate)‚ C2O42(oxalate): Salt + conc H2SO4 1. No reaction: Group II anion not present. Continue to group III. 2. Chloride: Colourless white pungent fumes (HCl); intensify when glass rod dipped in NH4OH is brought near mouth
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Chemical Reactions. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid A2 NaOCl Sodium Hypochlorite KI Potassium Iodide Observation 1: + Add 2 drops of starch Observation 2: A3 KI Potassium Iodide Pb(NO3)2 Lead Nitrate A4 NaOH Sodium Hydroxide C20H14O4 Phenolphthalein A5 HCl Hydrochloric Acid C20H14O4 Phenolphthalein A6 NaOH Sodium Hydroxide AgNO3 Silver Nitrate B1 AgNO3 Silver Nitrate NH4OH Aqueous Ammonia
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phosphofructokinase. In doing so it changes the enzyme conformation and lowers the rate of reaction so that less ATP is produced. Hypothesis: There is an inverse relationship between the mass of lead nitrate and the ability of amylase to convert starch into maltose. Variables: Independent Variable: The mass of lead nitrate dissolved in each of the solutions. Dependent Variable: The change in the color intensity of the iodine. Controlled variable: Time: the reaction was allowed to proceed
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testing these sugar to show or prove are they reducing sugar or non reducing sugar.Example of the test that can be done is Benedict test. 1 In plant‚glucose is stored as the polysaccharide starch.Example of food that rich in starch is oat‚cereal‚rice and corn.Starch can be divided into two groups which is that is amylose and amylopectin. Natural starches are mixtures of amylose
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C H A P T E R 5 Basic Concepts from Organic Chemistry 5.1 | INTRODUCTION The fundamental information that environmental engineers and scientists need concerning organic chemistry differs considerably from that which the organic chemist requires. This difference is due to the fact that chemists are concerned principally with the synthesis of compounds‚ whereas environmental engineers and scientists are concerned‚ in the main‚ with how the organic compounds in liquid‚ solid‚ and gaseous wastes
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test: Blue coloration turned to brick red precipitate. Reducing sugar is present in the solution A. Iodine test: The coloration remained unchanged. Starch is absent in solution A. Solution B Benedict’s test: The blue coloration remained unchanged. Reducing sugar is absent in solution B. Iodine test: The coloration turn into dark blue coloration. Starch is present in solution B. Table 2: Tube Contents Temperature(°C) Benedict’s Test-Colour Observation After min 5th min (from tubes
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