Pretty Colors Lab Background: In the pretty color lab I will be showing the effects of diluting a strong acid and strong alkali on the pH. The pH scale measures how acidic or basic a substance is, indicated by what is called an indicator. The pH scale varies from 0 to 14, below 7 being acidic, above 7 being basic, and 7 being neutral. There will be three different indicators used in the lab, Phenolphthalein, Universal, and Cabbage juice. Each of these indicators will be used to show the various colors created when diluting the acids and bases.
Experiment 5: Titration for Acetic Acid in Vinegar Name: Lab Partners: None Date of Experiment: March 25th, 2013 Location: My House Course Number: Chem 112 Abstract: In this experiment the objectives were develop familiarity with the concepts and techniques of titration and to determine the concentration of an acetic acid solution in vinegar. Experiment and Observation: Data Table 1: Quantity of NaOH needed to Neutralize 5 mL of Acetic AcidBrand of Vinegar Used: Heinz White Distilled VinegarLabel Notes: ______________________ | | Initial NaOH reading(Interpolate to 0.1 mL) | Final NaOH reading(Interpolate to 0.1 mL) | Volume of NaOH used | Trial 1 | 9.5 | 1.3 | 8.2 | Trial 2 | 9.7 | 1.4 | 8.3 | Trial 3 | 9.6 | 1.4 | 8.2 | Average volume of NaOH used: | 8.2 | Calculations and Errors: Errors: Calculations: A. Calculate the average number of mL of NaOH used for the 3 trials and record. B. Calculate the Normality of the vinegar using the previously given equation.
Title and Identifiers: Observations of Chemical Changes by the use of acids and bases. Abstract: To observe the small changes that occur in chemical reactions and attempt to interpret the changes of the atoms and molecules that allow for these small changes to happen; and to associate these chemical properties with household products. We will also learn how to separate mixtures. Experiment Procedures: 24-well plate is used as a convenient holder for the pipets of chemicals. 96-well plate is used for mixing the chemicals.
Methods My group used the method of titration to test whether the Vitamin C and lime juice nutritional facts where correct from their manufacture. First, we started with the standardized solutions, NaOh and HCl, to get familiar with how titrations work and start the titration of potassium hydrogen phthalate (KHP). We begun by gathering up all the necessary materials needed for the titration including: the general laboratory glassware from the bins, standard safety equipment, 50mL burette, phenolphthalein, NaOh (3 mol/L), HCl (3mol/L), KHP, ascorbic acid, and lime juice. The standardization of NaOh came first, which started by gathering the KHP and putting 1.5 g into 3 flasks with 50 mL of water in each. After we added the KHP to the 50 mL of water, we placed each one of the flasks onto a stir plate with a magnet in each flask so we achieved maximum stirring.
Identification of Copper (II) Chloride Introduction Through a series of cation and anion confirmation and elimination tests, the identity of an unknown compound can be determined. By subjecting certain standards to a series of tests, it will be known how they react when trying to identify the unknown. The results of these tests are crucial to correct identification of the unknown compound. Materials and Methods 0.5 grams of the unknown 11 was added to 5 mL of distilled water in a centrifuge tube to make the stock solution. To determine the cation, 6 M NaOH was added dropwise to the unknown solution until a precipitate was formed.
Experiment 4: Using Buffers Name: Andrew Duval Lab Partners: None Location: My House Course Number: Chem 112 Date: July 28, 2013 Abstract: This lab aims to teach us about the use of buffers, or in this case vinegar. Buffers are used to control the pH of a solution, because they are able to able to absorb strong acid or bases. Because of this fact, we can add acid or basic mixtures and control the outcome of the pH by also mixing a buffer in there as well. In this lab we will be adding 0.1M and 6M HCL and NaOH to a two mixtures. One mixture will contain vinegar, and the other will contain distilled water.
This experiment will help the researcher understand the effect that home solutions such as salt and sugar have on waters freezing point. The plan of the project plan is to start off by collecting all the materials needed in order to complete the experiment, next step to come up with a hypothesis, after creating a hypothesis a procedure must be used to carry out the experiment. After completing the experiment the last step would be to create a graph using the results from the experiment. Research was done in order to find does the amount of salt and sugar effects the freezing point of water? The concept of freezing point depression is helpful in applications where water needs to be kept in a liquid state.
From these equilibrium concentrations, the equilibrium constant for the reaction can be determined. The purpose of this experiment is to determine the equilibrium constant for the following hydrolysis of an ester reaction: CH3COOCH2CH3 (aq) + H2O (l) CH3CH2OH (aq) + CH3COOH (aq) Ethyl Acetate Water Ethanol Acetic Acid (EtAc) (EtOH) (HAc) The equilibrium constant, Kc, for the reaction will have the following expression: Several reaction mixtures will be prepared with different initial amounts of ethyl
Nail polish remover contains the mixtures yellow dye, water, gelatin, fragrance, propylene carbonate and glycerol. So you have to do the heating by immersing a 25 Mk flask into the beaker with water filled into a hot plate. Experimental Procedures 1. First you have to set the distillation apparatus up. Use the ring stand & clamps to support the apparatus.
* If the pH of tap water is tested, it will be a 6.5 making it an acid. * If the pH is tested for distilled water, it will be a 7 making it neutral. Independent and Dependent Variable Sprite The independent variable is the sprite. The dependent variable is the pH. Aspirin The independent variable is the aspirin The dependent variable is the pH.