Title Investigation of the suitability of indicators and instrumental detection of equivalence points in acid-base titration. Objective 1. To understand the importance of choosing suitable indicators for detecting the end points of acid-base titrations. 2. To obtain titration curves for some acid-base titrations. Materials and Method (Please refer to the General Chemistry BPH2012 practical manual pg 4-5) Results Part I: Suitability of Indicators A.Strong acid-weak base titration
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Typically‚ the known solution is added from a burette to a known amount of the unknown solution until the reaction is complete. Knowing the volume of the known solution added allows the determination of the concentration of the unknown. Often‚ an indicator is used to usually signal the end of the reaction‚ the endpoint. Concentration is the abundance of a constituent divided by the total volume of a mixture. Molarity is a concentration unit‚ defined to be the number of moles of solute divided by the
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An economic indicator is data that can suggest whether the economy is expanding or contracting. A leading indicator can be an index‚ stock‚ report or other measurement that signals the economy or market’s direction in advance. Leading economic indicators are statistics that precede an economic event. They are very useful in predicting what will happen in the economy because leading indicators have the potential to forecast where an economy is headed. It allows fiscal policymakers and governments
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10.1 COMMON ACIDS and ALKALIS in DAILY LIFE A. ACIDS 1) In our daily life‚ there are many foods‚ drinks and flavourings that taste sour. e.g. yoghurt’ lemons and vinegar. 2) They taste sour because they contain acids‚ which give the sour taste. e.g. Yoghurt contains lactic acid. Lemons contain citric acid. Vinegar contains ethanoic acid. 3) Many household cleaners and personal care products also contain acids. e.g. Toilet bowl cleaners contain hydrochloric acid. Some body lotions
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Pitot Static system A pitot-static system is a system of pressure-sensitive instruments that is most often used in aviation to determine an aircraft’sairspeed‚ Mach number‚ altitude‚ and altitude trend. A pitot-static system generally consists of a pitot tube‚ a static port‚ and the pitot-static instruments. Errors in pitot-static system readings can be extremely dangerous as the information obtained from the pitot static system‚ such as altitude‚ is often critical to a successful flight. Several
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Lewis acid‚ thus playing a role as a ligand. The indicators used in EDTA titrations are metal ion indicators. Metal ion indicators work by the presence of absence of metal ions. Just like EDTA‚ the metal ion indicators will bind with metals. When the titrations begin‚ Mg2+ will be formed in a complex with the indicator. Once EDTA is added‚ it binds to the free Mg2+ ions‚ and then it reacts with the Mg2+ ions that are already bound to the indicator. When the EDTA is added‚ the solution will turn red
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and apparatus is used‚ concluding a bracket‚ a moveable digital dial test indicator‚ U-section channel‚ moveable knife-edge‚ and three material beams: brass‚ aluminum‚ and steel. The experiment methods‚ and fixed point to the beam are the differences between these four small experiments. The aim of this experiment is to improve the ability to use the precision engineering components like moveable digital dial test indicator‚ also understand the formula: Deflection= WL＾3/3EI. To explain this formula:
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and apparatus is used‚ concluding a bracket‚ a moveable digital dial test indicator‚ U-section channel‚ moveable knife-edge‚ and three material beams: brass‚ aluminum‚ and steel. The experiment methods‚ and fixed point to the beam are the differences between these four small experiments. The aim of this experiment is to improve the ability to use the precision engineering components like moveable digital dial test indicator‚ also understand the formula: Deflection= WL＾3/3EI. To explain this formula:
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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
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Procedure: Part I: Titration with an Indicator 1. Fill the 50-milliliter buret with a 0.25 molar NaOH solution. 2. Record volume. 3. Measure out between 20 milliliters and 40 milliliters of the unknown HCl solution. 4. Record volume. 5. The amount of unknown HCl is then added to the 100-milliliter Erlenmeyer flask. 6. Add two drops of the indicator‚ phenolphthalein‚ to the acid in the flask. 7. Using the slider on the right hand side‚ add NaOH to the HCl in the Erlenmeyer flask (This action
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