is the almost the initial volume of HCl. In Condition 2 Trial 2 the initial volume of HCl was 8.0 mL‚ the substance stayed pink at 16.0 mL‚ so the amount of NaOH needed for neutralization was 8.0 mL. In the other conditions and trials the most that base was off from the acid was 1 mL. The average HCl and NaOH stayed fairly close‚ this is shown in Fig 1. The Hypothesis was supported. Evaluation: Limitation/Design Error Specific Effect(s) on Data Way to fix it? The phenolphthalein dropper was
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Observations of Chemical Changes Experiment 1 Chemistry 111 September 3‚2014 Ashley Mattox Abstract: The purposes of this lab is to observe the reactions of some common chemicals contained in consumer products and observe the macroscopic changes these chemicals undergo. Purpose: The purpose of the lab is to be able to interpret underlying macroscopic changes in terms of the behavior of atoms and molecules and also to learn how to separate mixtures into their component
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react when the equilibrium has been distressed. Objective: You will observe the application of Le Chatelier’s principle by observing the effects of acids and bases of on the solubility of Ca (OH) 2‚ the effects on Fe3+ and SCN- with Fe (SCN) 2+ to an equilibrium mixture. Also‚ finding the effects of an acid and base dealing with an indicator‚ and the effect on an acid on Ni2+‚ NH3‚ and Ni (NH3)62+. Data and Data Analysis: • Ca(OH)2 [pic] Ca2+ + 2 OH-
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|pH from Lab |Acid or Base? |Solution Name (from Lab results) | |Solution 1 |6 |Base |Water | |Solution 2 |1 |Acid |Lemon Juice | |Solution 3 |12 |Base |Bleach
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An acid-base titration is carried out by adding an acidic titrant to a basic solution. At which point should the titration be stopped and the volume of titrant used be recorded? Answer : when the solution reaches the endpoint Question = Buffers are substances‚ or mixtures of substances‚ that (help maintain a relatively constant pH when small amounts of acids or bases are added) Question= Which of the following statements best describes what determines whether an acid is a strong acid
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Chem Final Write Up- Kool Aid Lab Total Acid This part of the lab requires titration of Kool Aid with an NaOH solution. The reason titrations are used is to determine the concentration of an unknown solution by reacting a strong acid with a strong base. Titrations are hard to accomplish‚ though‚ due to the fact that indicators used to show the endpoints are very sensitive and one drop could make the solution titrate past its endpoint. Blue stock solution: 3 mg/L Yellow stock solution: 35 mg/L
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Importance of acids and base Acids and bases are very important to us because everything in our world is affected by them. We could not live in a world that is either too acidic or too base. Think about heart burn‚ to treat heart burn‚ we have to have an understanding of acids and bases. BASE 1. A base is any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water. 2. A base is a substance that changes red litmus
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1- The reaction HCl + KOH KCl + H2O is a a. synthesis reaction c. neutralization reaction b. ionization reaction d. decomposition reaction 2- What is the value of the self-ionization constant of water? a. 0 c. 1.00 107 b. 1.00 1014 d. 55.4 3- Pure water contains a. water molecules only. b. hydronium ions only. c. hydroxide ions only. d. water molecules‚ hydronium ions‚ and hydroxide ions
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up; sometimes it is easier to measure the change in the amount of product that has been produced. The reaction between metals and acids Acids and bases When acids react with bases‚ a salt and water are made: • acid + metal oxide → salt + water • acid + metal hydroxide → salt + water Remember that most bases do not dissolve in water. But if a base can dissolve in water‚ it is also called an alkali. Reactive metals Acids will react with reactive metals‚ such as magnesium and zinc‚ to make a
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Acid Determination of Vitamin C Tablets and Salt Solutions Chem 1290-016 03-05-2010 ------------------------------------------------- Purpose: The purpose of this lab was to use acid-base titrations to find the mass percent of ascorbic acid in a Vitamin C tablet. A known concentration of sodium hydroxide was used and the value found was compared to the stated amount of ascorbic acid listed on the vitamin container. Also in this lab the acidity of different salt solutions were tested using
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