In this experiment, we had to perform a lot of procedures in order to obtain an anhydrous alum at the end. What we first wanted to obtain was a hydrated alum crystal. To achieve this, we broken down aluminum foil into pieces and let it reacts with 25mL of 3M KOH. Next, we filtered it to get rid of any undissolved particles. Furthermore, we heated the solution and let it rest until crystals were formed, and then cooled it once again to get the hydrated alum crystals. Then, we washed/filtered the crystals by wetting them with a non-soluble solution and let the crystals dry. After that, we took 2g of the alum crystals and burned them on a crucible, taking its mass beforehand. Lastly, we heated the solution for five more minutes and let it cool to room temperature. …show more content…
First, alum possesses many medicinal remedies that can help people. Alum, (specially potassium ion), is used to treat and sanitize dirty water. While not tasteful yet effective, potassium alum had been used to treat water since their house flooded. Alum can also be used for its coagulant and healing properties, which help people with canker sores and other illnesses. Additionally, alum has artful and safety qualities. Alums can be found in flame retardants and pigments for art. Lastly and most unexpectedly, alum can be used for culinary purposes. Alum powder can be located in many recipes because it is used when pickling a vegetable and/or
The purpose for this lab was to use aluminum from a soda can to form a chemical compound known as hydrated potassium aluminum sulfate. In the lab aluminum waste were dissolved in KOH or potassium sulfide to form a complex alum. The solution was then filtered through gravity filtration to remove any solid material. 25 mLs of sulfuric acid was then added while gently boiling the solution resulting in crystals forming after cooling in an ice bath. The product was then collected and filter through vacuum filtration. Lastly, crystals were collected and weighed on a scale.
That familiar fizzing you hear when you drop an Alka Seltzer tablet into a glass of water is the result of a chemical reaction, and chemical reactions are extremely prevalent when it comes to what living things do to carry out life processes. In addition, environmental conditions can alter the results of chemical reactions, and in this lab, we will be answering the
A common over-the-counter medication for symptoms such as headache, stomach ache, and heart burn is Alka-Seltzer tablets.1 One of three ingredients found in the tablets is acetyl salicylic acid (C8H12O4) to relief head ache pains. The other two components are sodium bicarbonate (NaHCO3) and citric acid (C6H8O7) which are utilized under the acid-base chemistry rule in order to produce the fizzing sensation needed to produce excess CO2 to aid in heartburn and stomach aches.1 The Brønsted-Lowery Acid-Base Rule simply states properties of both types of substances and how they will react with when added to a solution. A base will accept a proton donation while an acid will donate the proton.2 Utilizing all of this information an experiment was conducted
I did accomplish the purpose of the lab. First, I determined the percentage of water in alum hydrate, and the percentage of water in an unknown hydrate. The results are reasonable because they are close to the example results. Second, I calculated the water of crystallization of an unknown hydrate. Furthermore, I developed the laboratory skills for analyzing a hydrate.
First there are a few materials needed to take an impression. The main ingredient is the alginate. Four or five table spoons of alginate are just enough to get the job done. A mixing bowl capable of holding at least three cups of the mixture is also needed. A spatula is needed for mixing the ingredients together. Another import...
The purpose of this lab was to explore hydrates when water is removed from a compound with heat. By heating the magnesium sulfate, the mass of the water can be determined as the difference between the original weight and the weight after being heated. Not only can the mass be determined but also the amount of moles, ratio of magnesium sulfate to water, experimental percent of water, theoretical percent of water, and etc.
The purpose of this lab was to determine the density of water and an unknown liquid, along with a rectangular solid and an irregular shaped solid. In this lab, the relative density was calculated and then used to make an educated guess on the substance. Density is the relationship between the mass of a substance and the amount of space taken up. This measurement is influenced by the mass of atoms, the size, and how they are arranged. The density of the four objects was determined by using the mass (g) and volume (mL or c3). Mass is the property of matter that measures its resistance to acceleration. In addition, volume is the amount of space that a substance or object occupies. Finally, the mass (g) was divided by the volume (mL or c3) to find the final density (g/mL or c3).
Arsenic is element 33 on the periodic table and is in Group 15. Arsenic is obviously an extremely poisonous element; however, some people have found arsenic to have a restorative effect on them. Chemically, arsenic is a metalloid. Two common forms of arsenic are gray and yellow. (see Figure 1-A) Element 33 has an atomic weight of 74.9216 and the chemical symbol of As. It boils at 613ºC, melts at 817ºC, and has a density of 5.72. (see Figure 2-A) The element has been known for centuries and can be easily obtained from ores such as arsenopyrite (FeAsS), realgar (As2S2), orpiment (As2S3), and arsenic trioxide (As2O3). There are many uses for arsenic. Among them is in the manufacturing of glass to eliminate the air bubbles and the green color caused by contaminated iron compounds. Arsenic is also added to materials such as lead and copper alloys to increase the strength and better the corrosion resistance. Although it is well known that arsenic is often used in tales (both true and otherwise) as a killing agent, arsenic has been used as a curative as well. Before penicillin was introduced, arsenic played a significant role in the treatment of syphilis. Other good uses for element 33 are as insecticides and semiconductors. Gallium arsenide (GaAs) is a known semiconductor that is also used as a laser material. A good test for the detection of arsenic is the Marsh test, invented by James Marsh, an English chemist.
Aluminium is present in the earth's crust in huge amount, mainly in the form of insoluble aluminium silicates. It is scarce in the human body which contain only 30-50 mg of that metal. This is due to the insolubility of aluminium, the presence of a barrier in the gastro-intestinal tract to soluble forms of aluminium, and the ability of the kidneys to excrete aluminium effectively in healthy people.
Sodium Chloride has a higher boiling point than water, so when salt is added to water, the solution has a higher boiling point than pure water. The sodium ions and chloride ions present in sodium chloride disassociate and dissolve in water. These ions interfere with the dipole interactions that occur between molecules of water. The dissolved sodium ions and chloride ions require more energy to separate from the water molecules in the solution than the water molecules from themselves, so the boiling point of the solution is elevated as a result.2
Anne Zhang 3/6/14 BSGE 7-1 Lab Report Problem Paragraph 1 Question: What is the effect of temperature on the dissolving time of an Alka-Seltzer? Alka-Seltzer is made up of baking soda, aspirin, and citric acid which gives the tablet the fizz when dropped in any temperature water. “Alka-Seltzer is a medication that works as a pain reliever and an antacid.
For the experiment, the effect of different alkaline solutions on the quality of yellow wet noodles was investigated. Four different formulations were used. For formulation A, sodium carbonate was used; formulation B, soda ash; formulation C, potassium carbonate and formulation D was the control with no alkaline solution added.
Introduction: A phase change is a result from the kinetic energy (heat) either decreasing or increasing to change the state of matter (i.e. water, liquid, or gas.) Thus saying, freezing is the phase change from a liquid to a solid which results from less kinetic energy/heat. Also, melting is the phase change from a solid to a liquid which results from adding kinetic energy/heat. So, the freezing and melting point of something is the temperature at which these phase changes occur. Therefore, a phase change will occur when a vial of 10 mL of water is placed into a cup of crushed ice mixed with four spoonfuls with 5 mL of sodium chloride for 30 minutes. If 10 mL of water is placed in an ice bath, it will then freeze at 5 degrees Celsius because the kinetic energy will leave quicker with the ice involved. The purpose of this lab is to observe what temperature the water must be to undergo a phase change.
1. The labels have fallen off of three bottles thought to contain hydrochloric acid, or sodium chloride solution, or sodium hydroxide solution. Describe a simple experiment which would allow you to determine which bottle contains which solution.
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may