THE PH SCALE Learning Objectives: To distinguish between acidic‚ neutral and alkaline solutions using pH values. To classify solutions of equal concentrations in terms of acid or base strength using pH values. To understand how the appropriate use of Litmus paper‚ Universal Indicator and pH meter can give an account of different degrees of accuracy in the measurement of acidity or alkalinity of substances. 1) Define what an Acid is. Give five characteristics of acids. An acid is a chemical
Free PH PH indicator Acid
be used. Teachers may distribute the experimental worksheet to students beforehand for reducing the stress of the students during practical assessment. In order to test students’ knowledge of detecting the end point of a titration ‚ an unfamiliar indicator‚ bromothymol blue‚ is used. Students have to decide the colour change at the end point. The assessment is mainly based on the written worksheet. Nevertheless‚ the teacher can walk around to observe student performance and to give some advice. The
Free Titration PH indicator PH
Discussion The acid neutralising capacity (ANC) of 3 brands of calcium carbonate (CaCO3) tablets was determined by reacting the tablets in excess standardized hydrochloric acid (HCl) and then back-titrating with a standardized sodium hydroxide (NaOH) solution. Back titration was required for two reasons. Firstly‚ CaCO3 tablets are poorly water-soluble but dissolve rapidly in acid. Secondly‚ CaCO3 is a weak base so it is difficult to determine the end point of the reaction if titrated directly. Assuming
Premium PH Hydrochloric acid Titration
study and search for more benefits from fruits‚ vegetables and other agricultural products. REVIEW OF RELATED LITERATURE Based on the information obtained from the website http://gardening.about.com/od/gardenprimer/g/pH.htm‚ the soil ph is the measurement of the soil’s alkalinity or
Premium PH Fruit PH indicator
ST ANDREW’S JUNIOR COLLEGE JC 2 Preliminary Examination CHEMISTRY 9647/03 Higher 2 13 September 2010 Paper 3 Free Response 2 hours Candidates answer on separate paper. Additional Materials: Answer paper‚ Graph Paper‚ Data Booklet READ THESE INSTRUCTIONS FIRST Write your name and civics group on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams‚ graphs or rough working. Do not use staples‚
Premium PH Carbon dioxide Hydrochloric acid
dissolve it in 10.0cm3 of 95% alcohol. 3. Titrate with 0.10 mol dm-3 sodium hydroxide solution using two drops of phenolphthalein solution as indicator in the first trial. 4. For the next trials repeat steps 1 and 2‚ but instead of using an indicator use an electronic pH tester to measure the pH of the solution to determine when its neutral; (PH -7) . 5. Record data‚ ml used in titration to neutralize every aspirin trial. Raw Data Collection: Quantitative Data: Aspirin A: Trial | Aspirin
Premium Sodium hydroxide PH Aspirin
energy necessary to make reactions occur‚ by lowering the activation energy of that particular reaction. There many factors that affect the rate of enzyme catalysed reactions such as; temperature‚ the enzyme becomes thermodynamically denatured‚ pH some enzymes are pH specific‚ and concentration of the substrate or enzyme. As stated above enzymes are globular proteins. They are held into shape by weak hydrogen bonds. If the temperature is increased to high‚ there is sufficient energy to break the hydrogen
Premium Enzyme PH PH indicator
there is an effect of bile salts on the digestion of lipids in the milk. When lipids are broken down in to fatty acids and glycerol (see below)‚ the acid lowers the pH of the mixture. To help me determine and measure the digestion of lipids‚ a pH indicator phenolphthalein has been used to measure the pH of the mixtures. The pH indicator will change the colour from pink to either white (if bile is not contained) or brown (if bile is contained)‚ this will indicate that the solution is changing from alkaline
Premium Enzyme Fat Bile acid
especially for critically ill patients in acute care ward and the Intensive Care Unit (ICU). And according to our previous knowledge‚ we have learnt several methods to check the correct placement of the nasogastric tube inserted‚ which includes using the pH paper to test the acidity of the gastric content aspirated. And the other ways are using chest X-Ray in the ward‚this is also the most reliable method to assure the correct placement of NG tube. And lastly is by auscultation (listening to the pop-sound
Premium PH indicator PH
Part A. Acid-Base Indicators Purpose In this part of the experiment‚ we will find a reagent that will shift the acid-base equilibrium reaction described by Equation (2) in one direction and then a second reagent that will cause the equilibrium position to shift back in the opposite direction. Introduction An acid–base indicator is a substance that changes color as the pH of a solution changes. Consistent with LeChâtlier’s principle‚ if a solution containing the indicator becomes acidic (e
Premium Chemical equilibrium Solubility PH