Introduction Background Indicators are used in acid-base titrations to determine end points as both acid and base are colourless in nature. However‚ indicators chosen must be suitable according to the type of reactions such as: - Strong acid-weak base titration - Weak acid-strong base titration - Strong acid-strong base titration - Weak acid-weak base titration Only the first two mentioned above will be investigated in this experiment. Aims/Objectives 1. To understand
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– weak base. The end-point occurs when the stoichiometric amount of base (or acid) has been added to the acid (or the base). The end-point is frequently detected using a visual indicator. An acid – base indicator is a substance‚ which changes colour with pH. For each type of acid – base titration an appropriate indicator must be chosen. See table 1‚ below. However‚ the end-point can also be determined potentiometrically using a pH meter or by a conductometric method. At this point‚ all the acid has
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7 Indicators That You May Have Skin Cancer Truthfully‚ cancer is a hated disease. Skin cancer affects the victims’ skin in different ways‚ at times even costing lives. However‚ you can detect it early and take the appropriate measures. If you ever detect any of the below signs on your skin‚ the best option should be to see a doctor right away and have the condition diagnosed at an early stage. In case it’s confirmed to be a cancerous infection‚ some tests have to be run to determine at what stage
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-1A2 CHEMISTRY MODULE 4 definitions (aqa) Rate of Reaction The rate of change of concentration with time (mathematically d[X]/dt). Units are mol.dm-3.s-1 (moles per cubic decimetre per second) Initial Rate This is the rate at the very beginning of the reaction when all the starting concentrations are known exactly. Rate Equation Rate Expression A mathematical expression which relates the rate to the concentrations of substances involved in the reaction Rate Constant‚ k This is the multiplying
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possesses a unique combination of multiple intelligences. All students have different learning attitudes‚ styles‚ preferences and ideals. Following are some of the learning behaviors. The model that is described below is MBTI (Myers-Briggs Type Indicator) for learning styles. However‚ it is modified a little to come up with our survey needs and for easy application. ACTIVE AND REFLECTIVE LEARNERS: * Active learners tend to retain and understand information best by doing something active with
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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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