As an analyst, accurate measurements are done with the help of volumetric glassware’s, like buret and pipet. Volumetric glassware are containers that have been calibrated at specific temperature to deliver or contain very precise amount of liquid. In order to ensure the accuracy and precision of the glassware’s then a calibration must be done. The assumption of volume for volumetric glassware is dependent on the cleanliness of the surface. Although accuracy is more important in TD (to deliver) glassware there should still be considerations for the messy and unpleasant substances on the surface of the TC (to contain) glassware. Soaking of the glassware for too long with detergent is not also advisable since it will likely develop a rough area …show more content…
Check if there are any leaks especially around the stopcock, the valve at the bottom of the buret. When it comes to calibration, it is calibrated by transferring water into an Erlenmeyer flask and weighing it using an analytical balance. This is done for two (2) trials, each with varying amounts of water. Erlenmeyer’s mass is pre-recorded before transferring water from the buret. The volume delivered by the buret is considered the apparent, which means evident, volume. Before starting another set, the flask should be clean and dry to avoid any error. The water inside the flask will add the volume to be transferred thus making the mass of water higher than what it should really be. The mass of water obtained thru weighing by difference would then be multiplied to the buoyancy of water at the recorded temperature which will then be the corrected mass of the water. The corrected mass of the water is then divided by the density of the water, at the same temperature, and will be considered as the true mass. Correction value can be obtained by solving for the difference between the true volume and the apparent volume. Some of the correction value computed are negative and it only means that there is an error that occurred. One of the possible errors in most volumetric glassware’s is reading the wrong volume. Volume must be read based on the lower meniscus at eye
When the liquid level is above the calibration line on the pipette, remove the bulb quickly and put your thumb or index finger over the pipette. Carefully “roll” finger to the side and allow the liquid to drop until the meniscus is level with the mark. Then hold the pipette over the flask to receive the liquid and remove the finger. Allow the liquid to drain out.
American businesswoman Carly Fiorina once concluded, “If a decision-making process is flawed and dysfunctional, decisions will go awry.” In the critically acclaimed memoir The Glass Castle, Jeannette Walls pilots a turbulent excursion through the bottleneck of her childhood and dysfunctionality and flawed decision-making is all too common. Throughout this memoir the reader learns of the the appearances and disappearances of stability and functionality, discovers the theme of fantasy vs. reality, and determines how and why the familial dynamics of the Walls alter through the duration of the memoir. The reasons for the instability of the family are evident.
“Life with your father was never boring.” – Rose Mary Walls. Rose Mary Walls, Jeannette Walls’s mother and Rex Walls’s spouse, reminisces life with Rex, which included migrating very frequently, refusing to conform, and advocating self-sufficiency. In Jeannette Walls’s The Glass Castle, Walls reveals that there are turbulence and order in life, the influence of family, and how she develops as she grows up through Walls’s recollection of her life, from living in a nomadic household, where her parents neglect their children, to living in a squalid hovel with no plumbing, and finally living in New York City, where she works as a journalist.
GLASS written by ellen hopkins intermenes the real life struggles that teenagers face everyday, from love to drugs to destructive relationships. Ellen really hits home showing the life of a once 4.0 honors student Kristina; whose life easily got turned upside down from one toxic summer at her fathers that will show the darkest side possible of life. An estimated 12 percent of children in the United States live with a parent who is dependent on or abuses alcohol or other drugs. Based on data from 2002 through 2007, it was to be reported that 8.3 million children under the age of 18 lived with at least one substance-dependent or substance-abusing parent according to Substance Abuse and Mental Health Services Administration (Paragraph 4). The bond between a child and their parents is so pure yet
Could the dysfunction of the Walls family have fostered the extraordinary resilience and strength of the three older siblings through a collaborative set of rites of passage? One could argue that the unusual and destructive behavior of the parents forced the children into a unique collection of rites of passage that resulted in surprisingly resilient and successful adults. In moving back to Welch, Virginia, the children lost what minimal sense of security they may have enjoyed while living in their grandmother’s home in Arizona. The culture and climate (both socially and environmentally) along with an increased awareness of their poverty resulted in a significant loss of identity. As they learned new social and survival skills in this desperate environment, there is a powerful sense of camaraderie between the older children. Their awareness, drive and cunning survival skills while living in Welch result in a developing sense of confidence in their ability to survive anything. This transition, while wretched, sets the stage for their ability to leave their environment behind with little concern for a lack of success. As the children leave, one by one, to New York, they continue to support one another, and emerge as capable, resourceful young adults.
My family isn 't like the Walls family because my parents would never treat my sister and I like their parents treated them, my family and I have a decent living situation, and we would never hurt any animal. From the beginning, Rex and Rose Mary treated their kids wrong and didn 't take responsibility as parents. Every child deserves a loving home and should never have to worry if they are going to eat that night. West Virginia also seemed a lot different then because the laws are more strict now. The way the Walls are, they would get in trouble for the way they treated their kids, animals, and even their living space. "Mom always said people worry too much about their children. Suffering when you 're young is good for you, she said. It immunized
3. Add on of the following volumes of distilled water to the test tube, as assigned by your teacher: 10.0mL, 15.0mL, 20.0mL, 25.0mL, 30.0mL. (If you use a graduated cylinder, remember to read the volume from the bottom of the water meniscus. You can make more a more accurate volume measurement using either a pipette or a burette.)
In this experiment, there were several objectives. First, this lab was designed to determine the difference, if any, between the densities of Coke and Diet Coke. It was designed to evaluate the accuracy and precision of several lab equipment measurements. This lab was also designed to be an introduction to the LabQuest Data and the Logger Pro data analysis database. Random, systematic, and gross errors are errors made during experiments that can have significant effects to the results. Random errors do not really have a specific cause, but still causes a few of the measurements to either be a little high or a little low. Systematic errors occur when there are limitations or mistakes on lab equipment or lab procedures. These kinds of errors cause measurements to be either be always high or always low. The last kind of error is gross errors. Gross errors occur when machines or equipment fail completely. However, gross errors usually occur due to a personal mistake. For this experiment, the number of significant figures is very important and depends on the equipment being used. When using the volumetric pipette and burette, the measurements are rounded to the hundredth place while in a graduated cylinder, it is rounded to the tenth place.
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One of the most interesting properties of glass is that of it being able to bend and reflect light. Through the bending and reflecting of light rays, an image is created. What happens though when the image formed is not the focal point but rather is the source of the image, the glass itself? In the commencement of Dave Eggers’s novel ‘The Circle,’ there is recurring images of glass. The lustrous, pristine, and progressive visage that glass supplies encapsulated the Company’s essence of high quality and rapid advancement, and as such comprised most of the physical structure of the building. However, the high-end aesthetic that glass provides is not the only idea that Eggers is attempting to promulgate through the glass images. The less obvious
The boundary between turbulence and order, a zone said to have no rules, like the Walls family. They didn’t live life like everyone else, there were no set rules they made or followed, and for the most part, the Walls family didn’t even follow the law. The Walls children’s life was built upon not having their parents tell them what to do and what not to do. Throughout the memoir, The Glass Castle, Jeannette endured many situations where she and her family are either pushing the boundary or are more on one side of it. Put simply, the Walls family epitomizes the line that separates chaos and control.
Start with the hot water and first measure the temperature. Record it. 8. Then pour 40 ml into the beaker. You can measure how much water was used by looking at the meniscus.
There is also the potential of human error within this experiment for example finding the meniscus is important to get an accurate amount using the graduated pipettes and burettes. There is a possibility that at one point in the experiment a chemical was measured inaccurately affecting the results. To resolve this, the experiment should have been repeated three times.
Possible sources of error in this experiment include the inaccuracy of measurements, as correct measurements are vital for the experiment.
Part A of the experiment, we were measuring the density of water. In this part, we measured by difference by measuring the mass of the empty graduated cylinder which was 46.35 grams and then added 25.0 milliliters of water to it. When subtracting by difference, our mass of the water was 25.85 grams. This was close to the measurements of the water added to the graduated cylinder. The density of the water was 1.0 grams/milliliters.