A hot plate was placed under the ring stand. 50 mL of 3.0 M NaOH in a 250 mL beaker and a stir bar was placed in the beaker. The beaker with NaOH was placed on the hot plate and 3.75 grams of NaAlO2*5H2O was placed in the beaker. The temperature probe was placed in the beaker with the solution, not touching the bottom of the beaker. The solution was heated and stirred till the solution dissolved.
Vacuum filtration was performed on the crude product, then it was recrystallized for purification. Melting point analysis was conducted on the recrystallized product to determine its identity. 3. The three possible mechanisms in this experiment were syn-addition
The substitution reaction was successful but not fully effective. 19. If the data was inconclusive, then comparing various compounds and the unknown based on physical characteristics would be the first step, titrations would also be a good method. 20. To get a better yield, redoing the experiment would require careful attention in the recrystallization steps: amount of solvent used, how hot solvent is, if the mixture cools to room temperature before placing it in an ice
The purpose of this experiment was to see which solute, Splenda, granulated sugar, or salt, would dissolve the fastest in distilled water. Solutes can only dissolve in solvents when they are polar. A polar bond is a covalent bond that has two atoms where the electrons forming the bond are unequally distributed (About Education.com). This causes it have a dipole or separation of electrical charges moment making it polar. For example, in a water molecule the electrons are not shared equally because the oxygen has more of a charge than the hydrogen bonds making the hydrogens pull towards the oxygen.
Mixture Separation October 6, 2015 Sasha Crowley Harrison Rossi Purpose The purpose of the laboratory was to determine the physical properties of four substances, then to separate a mixture of the substances based on their physical properties with limited amounts of materials available. Hypothesis
Calorimetry 1 The purpose of this experiment is to identify the mystery metal given to us (metal A). We are going to identify the mystery metal by looking at both its physical properties as well as its heat capacity. The heat capacity of the metal will be calculated using a setup/method described below. We will also look at the physical properties of the metal such as its magnetic properties, density, whether it is lustrous or dull, etc.
Dissolution is the process that makes solutions. A solution is a homogenous mixture of two or more substances. The solute in the solution is the substance that is dissolved, while the solvent in the solution is the substance that dissolves the solute during dissolution. The question introduced in this lab is “What factors influence the rate at which one substances dissolves in another?” The three factors that affect the rate of dissolution are temperature, how much you stir the mixture, and the particle size of the substances.
Introduction: The melting point of a pure substance is a characteristic that is physically consistent with each specific substance. When a substance is impure, it causes the melting point to decrease and the range of the melting point to increase. In order to identify a pure substance, it must be purified in order to get an accurate melting point estimation. Purification can be done through crystallization.
The two solvents in the unknown were correctly identified as acetone and toluene. The solvent with the lower boiling point was predicted to be acetone, as its boiling point was observed to be around 59 C, which was closest to the 56.5 C, the ideal boiling point of acetone. This result, however, had the possibility of being incorrect, since the boiling point of methanol, 64.7 C, was relatively close enough to the observed 59 C that methanol could have been incorrectly identified due to experimental errors such as turning the hot plate up too high. A similar situation could have occurred with toluene, the higher boiling point solvent, but this was less likely since there were no possible solvents that had a boiling point that close to toluene. The chromatogram confirmed the identity of the lower boiling point solvent as acetone, and the higher boiling point solvent as toluene.
Introduction: A crystal is a solid whose atoms are arranged in a specific repeating pattern. Real crystals undergo years to grow, but today's scientists have obtained a way to grow crystals right in the lab. They have also been effective in finding a way for people who aren’t scientists to grow crystals in the comfort of our own home. Although they may not be the same crystals we wear as jewelry, they give us a basic idea of the unique types of crystals that are made, formed and grown all over the world.
In Experiment One we will be recrystallizing Benzoic Acid from water. In Experiment Two we will be recrystallizing Benzoic Acid using a solvent pair made up of Methanol and Water. The Seven step process of recrystallization consists of adding a solid organic substance into a solvent, then dissolving the chosen solute, decolorizing the solution, filtering solids, then recrystallize the solute by slowly cooling
Experiment 4: Formal Report Preparation and Recrystallisation of Aspirin Aim of the experiment: In this experiment, a pure sample of aspirin is to be obtained through esterification to synthesise the sample, then purify the sample by recrystallisation. Lastly, determine the melting point of the sample to characterise the aspirin. Introduction: Background Aspirin (acetylsalicylic acid) is an aromatic compound that contains an ester- functional group and a carboxylic acid- functional group. Aspirin is commonly used as a pain reliever (analgesic), an anti-inflammatory, an anti-coagulant (prevent platelet aggregation) and an antipyretic (to reduce fever) pill.
Decomposition of Baking Soda Lab Introduction Chemical reactions are essential to the understanding of chemistry, and arguably the least straightforward type of chemical reaction is decomposition. The main reason for this difficulty is that a single compound can feasibly decompose in many different ways. An example of this is NaHCO3, more commonly known as baking soda, which can hypothetically decompose in three different ways, each leaving different solid products: NaOH, Na2O, and NaCO3. Our goal for this lab was to determine which of these decomposition reactions actually occurs. The way we did this was by using a chemistry principle called stoichiometry.
Then, the boiling tubes were left in a water bath at 45°C. After 5minutes, the boiling tub, labelled A, was withdrawn from the water bath. 4) The sample was filtered using a Buchner funnel, collected in a sample vile, labelled A, and positioned securely to dry and crystallise in an oven at 65°C. 5) After 45minutes, the boiling tube, labelled
On the other hand, white solid paracetamol, 100ml beaker, and 15ml of hot water, 20ml warm water, and water bath were used for the recrystallization purification technique. Evaporating dish, cold water, stirring rod, watch glass, small beaker, oven, cotton wool, and tissue were also employed in the recrystallization purification method. Method Recrystallization purification technique A portion of crude paracetamol sample was transferred into a 100ml beaker. To it, 10ml of hot water was added to dissolve it.
