baking soda) will be mixed with acetic acid (HC2H3O2, a.k.a. vinegar) to generate sodium acetate (NaC2H3O2) and carbonic acid (H2CO3). The carbonic acid will rapidly decompose to generate gaseous carbon dioxide and liquid water. You will calculate your theoretical yield of NaC2H3O2 For this reaction, we will need to use 0.025 moles of NaHCO3. Procedure: 1.
One method for preparing baking soda is through reacting crystalline ammonium hydrogen carbonate with brine according to the following equation: NH4HCO3(s) + NaCl (aq) --> NaHCO3(aq) +NH4Cl(aq) Eq. 1 Brine contains sodium chloride, the compound needed to make baking soda, as well as potassium chloride, lithium chloride, and calcium chloride. Once the reaction has been completed, the solid baking soda is filtered off, but some contaminants may be present in the solid. The first step in determining the purity of the sample is to perform thermal gravimetric analysis (Experiment 7) on the baking soda sample to determine the percent composition of sodium bicarbonate in the sample. A sample of the baking soda will be heated until it decomposes to leave solid sodium carbonate according to the following equation: 2NaHCO3(s) --> Na2CO3(s) + CO2(g) + H2O(g) Eq.
Doing the Experiment: 1.Heat the covered crucible for about 2 minutes. After the two minutes remove the burner and allow the crucible to cool. After allowing crucible to cool down (place fingers close to bottom of crucible bowl to make sure it has cooled down). It has cooled completely when you feel no heat. 2.When crucible is cool transfer it to the balance using tongs.
Title: What a Gas: Stoichiometry & Gas Lab Objective: To determine the starting amounts of baking soda and vinegar required to fill up a Ziploc bag. Safety: Don’t eat( Background Info: • Look up the chemical formula for baking soda and vinegar (look online, in your kitchen cabinet, in your textbook, etc) and write them here. • Write the balanced chemical equation for the reaction that takes place between baking soda and vinegar. (There are 3 products produced – one of them is a common gas.) For help, look on p. 50 in the Ultimate Chemical Equations Notebook for a similar reaction.
UNCW Honors Chemistry Lab #1- Laboratory Safety and Boiling Water Date Started: 8/26/11__________________ Date Completed __________________ Purpose: To determine the temperature at which water boils. To learn how boiling and melting are physical changes. Background Information/Observations: 1) Explain the most common scenario when you observe water boiling. 2) Explain how you could change the rate at which water boils. 3) Explain how you could change the temperature at which water boils.
5. Repeat until the mass is consistent. Data and Observations: Measured melting point | 93.0 ̊ C | Real melting point | 92.5 ̊ C | Mass of evaporating dish | 47.01 g | Mass of evaporating dish and crushed alum | 49.13 g | Mass of crushed alum | 2.12 g | Mass after 1st heating | 48.17 g | Mass after 2nd heating | 48.16 g | Mass of water driven off | .97 g | Mass of anhydrous alum | 1.15 g | Moles of H2O | .0539 moles | Moles of AlK(SO4)2 | .0045 moles | Mole ratio; H2O/AlK(SO4)2 | 12.0 | During the heating of the crushed alum in the hot water bath, the alum had liquefied. The boiling point temperature that was determined was 93.0 degrees Celsius. This process had taken a long time, but around 90 degrees
To analyze the purity composition in their baking soda, as well as the quality of workmanship, structural flaws, composition, and longevity, the Athenium Baking Soda Company has hired our team. In this experiment, we will determine if any KCl, LiCl, or CaCl2 contaminants are present in the sample of Athenium Baking Soda using emission spectra and calculations to determine percent composition. Skills of titration, emission spectroscopy, and thermal gravimetric analysis will be utilized in conducting this quality control procedure for the company; therefore, providing the utmost correct purity composition of the baking soda. Emission spectra will be conducted in order to determine which contaminants are present in the baking soda sample. The splatter method will be used for all of the 0.1 M (calcium, potassium, lithium) chloride solutions as well as the baking soda sample solution.
Chemistry 3/19/13 Calorimetry Lab Report Purpose: Calorimetry is the measurement of the heat flow into or out of a system for chemical and physical purposes. The purpose of this lab was to use calorimetry to find how much heat is absorbed or released when NaCl is dissolved in water. In this case, we will find the heat coming out of the system, in a chemical process. Hypothesis: Once the sodium chloride is put into the water, the temperature of the water will rise. Procedure: 1.
Add 10mL of unknown salt and water solution. Weigh beaker and solution, record weight. Under a Bunsen burner place the beaker put a thermometer in beaker. Increase in temperature shows that the water is heating up. As the water begins to boil, record the temperature.
Then 5 and 10 grams of salt were weighed using the weighing cup and the scale. The weighing cups of salt were poured into beakers B and C. B receiving 5 grams and C receiving 10 grams. As the hot plate was warming up the salt was stirred in using the stirrer. When the hot plate was ready to go we placed beaker C (with 10 grams of salt) onto the hot plate. Once it started boiling the temperature was taken and it was 102 degrees Celsius.