7.46 X 10-2 moles of HCl X 2 = .1492 moles of HCl used and the molarity would be .1492 moles HCl/ .05 liters HCl = 2.984 molarity. The amount of unreacted HCl in the solution is shown here: 0.1492 moles used - .0746 moles needed = 0.0746 moles unreacted. The amount of NaOH moles needed to completely react with this excess HCl is .0746 moles of HCl and .0746 moles of NaOH. To titrate the excess HCl you would need a molarity of 2.984 NaOH. In the equation Zn(s) + 2HCl (aq) = H2 (g) + ZnCl2 (aq) ZnCl2 is soluble. When using NaOH the equation would be ZnCl2 + 2NaOH = Zn (OH)2 + ZnCl and Zn(OH)2 has a low solubility.…
We will be using the LoggerPro and LabPro in order to help us determine our data. The purpose of this experiment is to follow the changes of pH during the titration of an acid and a base in order to determine the of the weak acid, . is a constant for a given acid at a given temperature. In this experiment we determined the Ka using two different methods: 1) the measurement of the pH of a solution containing a known concentration of a weak acid, and 2) measurement of the pH at the half-neutralization point in the titration of a weak acid and a strong base.…
Alkyl halides are compounds in which a halogen atom replaces a hydrogen atom of an alkane. Alkyl halides are classified as primary, secondary or tertiary depending on the number of alkyl substituents directly attached to the carbon attached to the halogen atom. The purpose of this lab was to properly prepare t-butyl chloride from t-butyl-alcohol in a concentrated hydrochloric acid. The reaction occurs through a nucleophilic substitution, which is when a nucleophile replaces the leaving group in the substrate. In this lab, the hydroxyl group of t-butyl alcohol is replaced by a chlorine atom. The reaction proceeds through an SN1 mechanism (Weldegirma 38-41).…
One of the challenges of agriculture is finding the right balance between growing healthy nutritious food; protecting humans, wildlife, and the environment from pesticides and herbicides; and ensuring a profit. Scientists and agronomists work together to help find this balance. This lab will give you an opportunity to learn about one of these collaborations.…
K. Stage knobs or clips – secures and adjusts the slides position on the stage…
[Mass of unknown mixture (NaCl + NaHCO3) + Mass of HCl ] – [Mass of NaCl + H2O]…
A. Create a solubility curve for NH4Cl by plotting g NH4Cl/100 mL H20 on the y-axis, and crystallization temperature on the x-axis. Make sure to label each axis. On the same graph as the solubility curve for NH4Cl, add the solubility curve for NaCl using the data provided in Data Table 3.…
There were only two peaks, the first being acetone which is the reference point, the second peak was the thriphenylmethanol. If any other compound was present in the solution, it would have appeared in the results. In all three starting materials, it still gave a GC result of only two peaks. In our run of all three solutions together, there was a third peak, the percent area of that peak was only 0.55%, the other group that ran the same solution of all three mixed together did not have the third peak.…
1. A value chain is the sequence of activities that begins with raw materials. What result does a value chain end with? Delivery of products or services…
The pGLO lab is a lab where students attempt to put the genes that make a jelly fish glow into E. Coli. After a process called transformation, the process in which a cell takes up and expresses a new piece of genetic information, the E. Coli will be able to glow and will be antibiotic resistant. The students first need to learn a couple of techniques before they are able to begin this lab. The first technique they will need is how to keep their environment sterile. They must learn to only open their tools, and other supplies for as long as they need, and keep them from touching anything. They must also learn that tools can never be shared between specimens, and when they use a tool, they should dispose of it and get a new one. Next they need to learn how to transfer a bacterial colony. To do this, one must use a sterile loop and scrape one colony off of the dish. Then they must insert the loop into…
The purpose of this lab was to use gas chromatography to determine the relative amounts of the three components of gas products from the dehydration reaction of 1- and 2-Butanol with sulfuric acid and the dehydrobromination reaction of 1- and 2-Bromobutane with potassium tert-butoxide.…
Dissolved oxygen is oxygen that is trapped in a fluid, such as water. Since virtually every living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life. The dissolved oxygen is measure in units of ppm—or parts per million. Examine the data in Table 2 showing the amount of dissolved oxygen present and the number of fish observed in the body of water the sample was taken from; finally, answer the questions below.…
Previous to the reaction, the magnesium appeared to be a solid, white, black, and grey substance with many small dark particles within the substance. The hydrochloric acid was a clear liquid that looked like water It weighed 42.2 grams in total. During the reaction, the two substances produced bubbles, creating smoke and became warm with a smell that is irritating to the human nose. After the reaction, it appeared to be a clear, bubbly liquid with white spots. It weighed 42.2 grams in total after the reaction. The creation of bubbles, the different smell, and the increase in temperature told me that a chemical reaction occurred within the substance.…
a. Focus: A means of moving the specimen closer or further away from the objective lens to render a sharp image.…
6. (5 points) Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B? (a) The AB bond is largely covalent with a d– charge on A. (b) The AB bond is largely covalent with a d+ charge on A. (c) The AB bond is largely ionic with A as the cation. (d) The AB bond is largely ionic with A as the anion.…