Once the acid was warm, the Potassium Iodate solid was added to the liquid. If the solution did not reach 25 mL, students added more acid to fill the flask. Next, students labeled this substance "Solution…
Three drops of each liquid were put onto into the spots on the spot plate (with pH paper). 4. The color of the pH paper was noted to determine the pH of each substance. 5. A result of the pH level of each substance was recorded in an observation chart.…
1. a. My data demonstrated the law of conservation of mass in part 5 of the experiment, dissolving sugar in water. The law of conservation mass states that matter cannot be created or destroyed by can enter or leave the system. The system’s change in mass was 0.00 grams, resulting in support of this statement.…
Each content was mixed well. Observations were recorded. 5 drops of vinegar were added to each of the five samples in the second column of the spot plate. Each content was mixed well. Observations were recorded.…
The experiment began with a reaction of a 1cm3 cube of lamb liver and 5mL of hydrogen peroxide solution being put in test tubes in a beaker filled with 10℃ water until the temperatures of the liver and hydrogen peroxide were 10℃ also. The liver was put into a 100mL measuring cylinder and the hydrogen peroxide was also poured in as the timer was started. After twenty seconds, several millilitres of froth had been produced from the chemical concoction. This froth was recorded into a results table, and the previous steps were repeated but with increasing temperature increments of 10℃ until 50℃. After carefully completing the experiment, the final results obtained by measuring the volume of the froth produced after 20 seconds, were recorded in a table - see Table 1, and able to be observed in a graph, see Figure 7.…
Jessica Hill CHM 144M Section C Dr. Zhu Charles Dotse Aileen Decker 8 October 2015 The Quantitative Determination of an Acid in Carbonated Beverages Abstract: The basis of this lab was to juxtapose two different titration methods in their ability to identify the end point, calculate the molarity of citric acid in the two sodas, and apprehend the differences between polyprotic and monoprotic acids. In order to accomplish this, a traditional titration, with phenolphthalein, and a modern titration, with a pH probe, were executed. Through the use of the equation for molarity and stoichiometry, the molarity of citric acid was able to be calculated from V_NaOH, which was found in the traditional titration by subtracting Vi from Vf and…
The purpose of this experiment was to evaluate the stoichiometric relationship between the testing agents and to identify the products formed. The relationship was found by completing three acid and base neutralization reactions using phosphoric acid, which is a triprotic acid, with different volumes of sodium hydroxide. Introduction When looking at the coefficient of balanced equations, stoichiometry is seen.…
The experiment goal of the lab is to determine the concentration of acetic acid (CH3CO2H) in the commercial white vinegar brand. Procedure and Data Statement The complete experimental procedure is available in the General Chemistry Laboratory Manual for CSU Bakersfield, CHEM 211, pages 60-61, 64-65. Experimental data recored on the attached data pages 62-63, 66-68.…
A chemical reaction is a process in which one or more substances, which are the reactants, are converted to one or more different substances, which are the products. The substances in a chemical reaction are either chemical elements or compounds. There are different observations that indicate a chemical reaction has taken place. Formation of precipitate, which is a solid formed in a chemical reaction. Precipitate can take place when solutions containing ionic compounds are mixed and an insoluble product forms.…
The determination of the pH of a buffer solution and the pKa for of a weak acid Introduction A practical was carried out to show how the Henderson-Hasselbalch equation works and to apply and hone the skills of pipetting, buffer-making, pH-meter use and graphing. The primary goal of the practical was to determine the pKa value of a weak acid. The Ka is an acid dissociation constant, it is a quantitative measure of the strength of an acid in solution.…
For the following lab, the purpose is to utilize titration to determine the amount of ascorbic acid (vitamin C) present in a substance by reacting it with potassium bromate. An oxidation reaction takes place with ascorbic acid to produce dehydroascorbic acid, using an excess of bromine. The total amount of bromine utilized during the experiment is determined utilizing a back titration, in which the bromine is reacted with bromate. One mole of bromate produces three moles of bromine and the excess amount of bromine is determined by converting an excess of I- to I2, with potassium iodine, in which iodine is determined using a back titration. One mole of Br2 produces one mole of I2 and one mole of I2 requires two moles of S2O32-. 1.…
The goal of this laboratory experiment was to determine the identity of an unknown ionic compound, unknown sample 3, through the substance’s chemical properties and reactivity. This compound was discovered in a landfill and we needed to know as much information as we can about how the chemical will behave in different situations so that the city will not be negatively affected by the chemical.2 Thus, we first needed to identify the unknown substance, determine some of its chemical properties and reactivity, and also its synthesis.1 To accomplish this goal, we carried out five tests, the conductivity, solubility, cation, and anion tests because they revealed the identity of unknown sample 3.3 In addition, we carried out five reactions, reacting…
By using these concepts and techniques, we created a dilution curve to display and understand our data. Procedure1 Materials The materials used in this experiment are whole grain cereal, Sodium Acetate, water, hydrochloric acid, 2-2 Dipyridyl solution, Hydroxylamine-HCl, and D.I. water.…
As far as the second part of the experiment was, the 0.0025% deviation indicates that the titration was accurate. The ending molar mass (202.59 g/mol) of the mystery acid points to two possible suspects. The first being Cesium Diuranate, and the second Sodium Diuranate. Without the information it wasn’t possible to determine which one it would be. There is also a chance that the results had small deviation (accurate) but were not precise.…
We predict that if we known the concentration of the acid, HCl, then we can determine the concentration of the base, NaOH because using the standardized NaOH solution, we will determine the concentration of acetic acid because hydrogen ions neutralize hydroxide ions. The experiment was conducted by using a buret and an indicator in order to be able to tell when the mixture had reached the equivalence point. Results showed that the concentration of acetic acid in vinegar can be determined by first calculating the average of the concentrations of the NaOH in three different trials, then replacing the HCl with vinegar to calculate the concentration of the acetic acid in the…