Freezing Point Depression Lab

Pour this mixture, while stirring, into a beaker containing 25 mL of ice water to which 5 mL of concentrated hydrochloric acid have been added. The diazonium salt of sulfanilic acid should soon separate as a finely divided white precipitate. Keep this suspension cooled in an ice bath until it is to be used. 2. Methyl Orange 1.

The solution was then seeded and set alone once more. When the process was complete, the crystals

On a glass slide, 1 drop of distilled water was placed. Then, a loop-full of culture was transferred on the slide and it must be spread. It is then allowed to dry. Then, the smear must be heat fixed by exposing it to flame for few times until it got fixed. It is to prevent the cell from washing away during the staining and washing process.

The experimental molar mass was 45.56g, which is closely identical to the 46.068g of the molar mass of ethanol. The percent error between the two values is 1.10%, the probable sources of error are the following: the size of the tiny hole in the aluminum foil, measurement of the temperature in the thermometer, and measurement of the initial volume of the flask. The recommendation for the experiment is to dry the flask completely before measuring the initial mass and to closely observe if the temperature of the water bath is

Use a stopwatch to track the time of the combustion of ethanol. While the water within the beaker is being heated, use a stirring rod to stir it. Put the fire out when 4 minutes have elapsed. For safety precautions, let it cool off a bit before using the scale to measure and record, the final mass of the alcohol burner containing the ethanol.

The Effect of Alkaseltzer Tablets on the Boiling Point of Water Zackary Zambrano Chemistry Honors Mrs.Gregor Period-3 10/5/16 Introduction Statement of Purpose: The purpose of this experiment is to see whether or not alkaseltzer tablets have an effect on the boiling point of 100 mL of water. The control is just water, the variable groups are 100 mL of water with one tablet, and 100 mL of water with two tablets. “What exactly is boiling? The technical definition is what occurs when the vapor pressure of a liquid is greater than or equal to the atmospheric pressure. ”(Lopez,k) Simply put water, boils when enough energy is released to cause bubbles and then turn to vapor.

Decomposition of Aspirin Studied with UV/Visible Absorption Spectroscopy Aims:  To determine the concentration of salicylic acid, formed from the hydrolysis of Aspirin, at regular intervals using the UV/Visible Absorption Spectroscopy  From the concentration of salicylic acid, concentration of Aspirin to be determined using an equation  Calculate the rate constant of this reaction and its order from a plot of graph of ln(aspirin) vs time  Discuss the overall flaws and improvements to the experiment Results: As per schedule1, 0.212g of aspirin was added to 50 ml boiling water to form salicylic acid in a 100 ml flask, of which 1 ml was then pipetted to a 50 ml volumetric flask at the 5th min. Following an ice bath, the solution was mixed

Place the lid back on the Styrofoam cup. 8. Record the temperature every 30 seconds for a total of 10 minutes. Chemicals Quantity Sodium chloride powder (NaCl(s)) 20 g Water 500 ml Page 5 of 7 9. Repeat steps 4 to 8 for a total of 3 recordings.

For example, if the water volume is decided to stay constant as 1000mL for every trial, one can always first fill the tub with 400mL of tap water and then add ice or hot water to manipulate the temperature. In addition, the process can be facilitated by marking 1000mL on the plastic tub since the same tub will be used throughout the

This temperature represents when volume is also equal to zero. Absolute zero is when temperature is 0 K, leading to pressure and volume to also equal zero. The calculated number is slightly off from the actual, accepted value for absolute

Before starting the heating process, measure the weight of the crucible with its cover first and then tare the balance, and after that adding about 1 gram of the sample to the crucible with its cover, and then weigh it. Moreover, it is possible liberating harmful gases during the process of heating; therefore, being careful is important. The heating process ends when this sample changes the color to brown because water of hydration is removed to the sample. Additionally, give time to the small cool down and measure its weight. Next, transfer the sample to a 50 mL beaker and mixes with distilled water, which gets by rinsing the crucible with its cover in 8mL, so the solution is generated.

The chloroform and caffeine mixture was collected and into a conical flask labeled A. The remainder of the solution was discarded. This was repeated for beakers B and C. 9. Sodium sulphate was then added to each beaker to dry the liquid by getting rid of any remaining water from the solution. The sodium sulphate was then filtered and discarded.

AP Chemistry Semester 1 Final Review 2016 Basics of Chemistry: Name the following compounds BO3 H2S NaOH OF8 PCl6 HNO3 HgNO2 Write the formula for each compound Pentaboron triselenide Sulfuric Acid Carbon Monoxide Lithium Chloride How many moles are in 58.6 g of AgNO3 How many grams are in 2.5 moles of Cl2

Unknown 6- Isopropyl Alcohol We found that unknown 6 was Isopropyl alcohol. Its chemical name is isopropanol and the chemical formula C₃H₈O but is typically called isopropyl alcohol. Isopropyl alcohol is today used as a primary ingredient in rubbing alcohol. Is smells very unpleasant and is used for disinfecting pads used by medical professionals for tasks such as sanitizing small instruments, wiping down surfaces, and cleaning a patient’s skin before an injection.

Introduction The purpose of this week’s lab was to enhance our understanding of the Grignard reagents that were examined in lecture. In this lab, a Grignard reagent will be prepared through the reaction of magnesium turnings and bromobenzene. Instead of isolating the product it will then be combined with benzophenone, which will give the final product of triphenylmethanol. Procedure