The purpose of experiment ten was to collect data on an unknown weak acid by watching and measuring the weak acid being neutralized. This was done by using a Vernier Probe and using the data to figure out the identity of the unknown acid. A weak acid will have a strong conjugate base. The pKa of a weak acid can be taken from the – log (ka) or by using pH. To find the pKa using the graph of the pH in the experiment the equivalence point was found and ½ of this point is the pKa of the unknown weak acid. To determine the molar mass of the unknown acid the moles of base has to be determined along with the mass of the acid (Westfield, n.a). The equivalence point needed to determine the pKa is the point of the titration curve where the pH begins
If Na undergoes a chemical reaction with Cl, and if K undergoes a chemical reaction with I, what can you say about all the elements that belong to these 2 different families (families from questions 3 and 4)?
Ionic compounds are soluble in water to a certain point depending on the compound. The level of solubility changes among different compounds. Some ionic compounds can completely dissolve in water and appear to be a homogeneous mixture. Although, some ionic compounds dissolve very little, and could be considered insoluble, since it does not dissolve fully. Depending on the compound, the level of solubility can be high or low. However, ionic compounds could dissolve to a certain degree. If the solution appears to be a heterogeneous mixture, many may assume through visual representation that it may be insoluble. As stated previously, the smallest amount of solubility should be considered. To confirm whether or not the substance is soluble, observe the efficiency when conducting electricity. Due to practical reasons, the slightest solubility could be considered insoluble by people.
The human sense of touch is known as the somatic or somatosensory system. The skin is the biggest and most complex organ in the somatosensory system.The somatosensory system permits the human body to experience pressure, texture, temperature, and pain, and to see the position and development of the body's muscles and joints.The receptor cells in the skin can be separated into three useful classifications: mechanoreceptors that sense pressure and surface, thermoreceptors that sense temperature, and nociceptors that sense pain. Thermoreceptors distinguish changes in temperature utilizing two sorts of receptor cells: warm and cold. Thus, thermoreceptors on the skin detects the temperature signal using two specific receptors cell: warm and cold.
Figure 3 13 : A photo and SEM micrographs of flank face; (a) a photo of flank face and tool wear region (b) SEM micrograph of flank face; a micro fracture is shown (c) highly magnified flank face shows some holes and scratches probably caused by TiC particles and a smooth adhered layer which has covered the scratches and grooves. It can be seen that the sharp cutting edge of an unused tool has been chamfered after 1 second of machining and has left a sheared surface at the wear land.
The purpose of this experiment was to determine the pKa, Ka, and molar mass of an unknown acid (#14). The pKa was found to be 3.88, the Ka was found to be 1.318 x 10 -4, and the molar mass was found to be 171.9 g/mol.
My unknown organism #6 is Morganella morganii, which is a gram-negative bacillus rods commonly found in the environment and also in the intestinal tracts of humans, mammals, and reptiles as a normal flora. (3, 5) This bacterium Morganella morganii, was first discovered in the 1906 by a British bacteriologist named H. de R. Morgan. (2) Despite its wide distribution, it is an uncommon cause of community-acquired infection and is most often encountered inpostoperative and other nosocomial settings. (2, 3) Morganella morganii infections respond well to appropriate antibiotic therapy; however, its
The goal of the experiment was to identify Unknown 33A and 33B. Unknown 33A was a white, crystalline solid that had a sweet cherry smell and Unknown 33B was a beige, yellowish color liquid that was translucent and had a viscosity similar to water. Also, the liquid was homogenous and smelled sour, similar to mildew.
Unknown lab report# 24 Introduction Microbiology is a study of organisms that surrounds us every day. It requires an educational understanding to identify organisms, and the ability to distinguish different bacteria’s. In applying the learning process of the different bacteria’s, unknown bacteria samples are given to be studied and identified.
Identifying Organism 6C Introduction: This report details the steps taken and processes used to discover the identity of the unknown organism given to me on Tuesday, November 28th, 2017. With all of the knowledge and skills gained over the semester, in class and in lab, I was able to positively identify my unknown organism. The objective of these labs being, that I successfully utilize the tests and procedures taught during the course to correctly identify my organism and to be able to explain the reasoning behind my tests and results.
Observe and measure a weak acid neutralization and determine the unknown identity of an unknown acid by titration.
An unknown was given to our group from the professor. The unknown was in nutrient broth, the group received unknown number 3. And the task was to identify the unknown and try to make an educated guess, and identify the unknown #3.
Experiment 5 titled “Acids, Bases, Salt, and pH”. The purpose of this lab is to become familiar with some properties of salt, bases, and acids, measure acidity (pH), and correlate abnormal acidity of blood or urine. The activities for this lab is to measure the pH of some acid solutions and base solutions using pH paper/meter, and neutralize an acid solution by reacting with base solutions. To begin this experiment (Acid), there will be bottles of different acids (hydrochloric, nitric acid, sulfuric, and acetic acids) on top of the bench. Place one drop of each acid on a blue and red litmus paper and then place a drop of each liquid on (pH) paper. Record the observations. For the Base, place one drop of each liquid (sodium hydroxide, ammonium
Conducting this lab there was many parts that determined the results of each section. Beginning the lab we were provided a weak acid, which was labeled as the Glycine, which contained a pka of 9.5. A weak acid is recognized as an acid that ionized partially. With a weak acid it makes it similar to the weak base due to that also being only partially ionized rather than completely ionized. During the experiments we had Solium Glycaine as our weak base. With the use of our weak acid and our weak base we were able to develop an equal mixture of both solutions together to create our buffer. The buffer developed was both the Glycaine and the Sodium Glycaine equally mixed together. The use of a buffer is what is used to adjust the value of
Table 2: Consists of color extract taken from a red cabbage for a natural indicator. The pH reading that was measured by using the pH meter and the result of the pH reading to determine whether the solution was acidic or basic.
Place your pH meter in your sample and begin reading. Once your pH meter is placed in your sample, press the measure button and leave the pH meter in your sample for approximately 1-2 minutes.