□ The end point in a titration is often signaled by the color change of an indicator and occurs just slightly past the equivalence point. □ An indicator is a substance (weak acid) that has distinctively different colors in acidic and basic media. *Not all indicators change color at the same pH‚ so the choice of indicator for a particular titration depends on the strength of the acid and base. An indicator is chosen whose end point range lies on the steep part of the titration curve
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------------------------------------------------- Canadian Economy Assignment #1 Canadian Securities Course October 19‚ 2012 ------------------------------------------------- Canadian Economy
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adjusting the pH of the sample (i.e. Dove shampoo) to 5. In colorimetric determination‚ different acid-base indicator were added to different buffer solutions‚ and the pH where the change in colour were seen were noted. The data shown later would show a different change in colour for every pH‚ which indicates that the hydrogen or hydroxide ions change in an aqueous solution due to the pH indicators. !! !I. ! INTRODUCTION pH is often heard and always computed every Chemistry class but is it only important
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ACIDS 1. Acids are chemicals which will turn litmus paper red. Litmus is a colored Chemical which can change from red to blue and back again. Which colour it is Depends upon the concentration of Hydrogen ions. If the concentration of Hydrogen ion is higher than it is in pure water then the litmus will turn red. If it is lower than in pure water the litmus will turn blue. 2. An acid is a substance that turns blue litmus paper red acids can‚ be identified due to specific
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the various petrol pumps at the time of filling of tanks. Key words: Liquid Level Detector Gauge sensor Fuel Meter INTRODUCTION circuit‚ the resistance increases and current reduces. On the other side of the fuel gauge‚ there is an indicator or gauge that displays information about fuel levels to the driver of a car. This can consist of either a bimetallic strip or a microprocessor connected to the circuit in the sensing unit. As resistance changes in the circuit‚ current increases
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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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