pH indicators‚ in chemistry‚ are usually a weak acid or base that are naturally occurring in various plants and flowers and can act as dyes. Some examples of indicators are Litmus (Comes from a plant species called a lichen)‚ Phenolphthalein‚ Thymol blue‚ Bromocresol green and Universal indicator. All these indicators have a certain turning point in color once a certain concentration equilibrium of Hydrogen cations in reached (H +) or a certain concentration equilibrium of H3O+(Also OH - using Arrhenius
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Chapter 10 Practice Test: 1) How do you make a proton out of a hydrogen atom? E) remove an electron from a hydrogen atom 2) What is an acid? E) anything that donates hydrogen ions 3) What is a base? D) anything that accepts a hydrogen ion 4) What best describes what happens when an acid such as HCl is mixed with water? B) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. 5) According to the following reaction‚ which
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Acid Base Titration bre’ana March 1‚ 2013 Purpose: The purpose of this experiment is to determine the concentration of a solution of NaOH by titration with a standard solution of HCl. It was also the purpose to determine the concentration of a sample of white vinegar by titration with a standard solution of NaOH. Introduction: Using the method of titration is how the experiment gets to the conclusion of the concentration of a solution. When doing this experiment‚ measurement is very important
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this experiment is if I put an acid or a base in to a neutral then it will change colors. My hypothesis was correct in assuming that it would change colors with different substances or mixtures. If I put an acid or a base in to a neutral then it will change colors. The red cabbage indicator did change colors. Greens for bases and reds and pinks for acids. An alternative hypothesis for this could be “If the red cabbage indicator is purple then adding a base or an acid will turn it different colors
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Experiment 1: Observations of Chemical Changes Purpose: To observe the macroscopic changes that occur in chemical reactions and attempt to interpret the microscopic changes of the atoms and molecules that allow for the macroscopic changes to happen; and to associate these chemical properties with household products. Also‚ it is to learn the importance of how to separate mixtures into their component substances by solubility. Procedure: Before starting with the official experiment‚ it was important
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by mass of acetic acid‚ CH3COOH in vinegar. Acetic acid is monoprotic and belongs to the carboxyl family of organic compounds. The titration method is used to neutralize the acids by using the standardized sodium hydroxide solution. It reacts with bases which is sodium hydroxide‚ NaOH to form salt and water. The equivalence point of this neutralization reaction can be determined using a chemical indicator to signal the endpoint. The graph should be plotting to take reading of the equivalence point
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Abstract The aim of this experiment was to determine which of the samples of vinegar if any had been watered down‚ to complete this task a sample of commercial vinegar was tested twice using titration and an average was taken of the two samples to give a base line to compare the potentially tampered samples against. Introduction Vinegar is a solution made from the fermentation of ethanol (CH3CH2OH)‚ which in turn was previously fermented from sugar. The fermentation of ethanol results in the production
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the flask. When phenolphthalein was added to the unknown acid solution‚ the solution remained clear. At first‚ when the NaOH base was added to the unknown acid solution‚ the solution where the base had dropped into changed into a pink colour which disappeared after swirling the flask containing the unknown acid‚ which returns to being clear. However‚ after more NaOH base was added to the unknown acid solution‚ the solution eventually turned pink after swirling the flask. Data processing: As
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Red Cabbage Indicator Indicators are chemical compounds that can be added to a solution to determine whether it is acidicor alkaline. The indicator will change colour depending on whether an acid or an alkali is added. The colour in red cabbage (it is a pigment called an anthocyanin) makes a very good indicator. Acids and alkalis Acids have a sour taste‚ like vinegar (which contains ethanoic acid) and lemons (which contain citric acid). Alkalis are substances that react with acids and neutralise
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curve is expected to start out fairly acidic (pH= 2.80) because the initial specie is the HC2H3O2 itself. As more base is being added‚ the solution reaches its buffer region wherein the acid and base neutralize each other. It can be identified on the titration curve where the pH does not change abruptly. Here‚ the main species are HC2H3O2 and C2H3O2- wherein any small addition of base‚ the OH- reacts with the H+ to form water. This will lower the [C2H3O2-] so the equilibrium will shift to the right
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