Pipette Essays

Chemistry Exploration Topic: determining the activation energy of a chemical reaction Research Question: What effect does temperature of the chemical reaction have on the activation energy ? ICT: Microsoft Word Autograph Microsoft Excel Introduction This experiment is designed to help in estimating the activation energy of the rate-limiting step in the acid catalyzed reaction of acetone with iodine. This is achieved by measuring the reaction rates at different reaction temperatures over

ACIDITY TEST INTRODUCTION: Acidity is the total amount of hydrogen ion present in the food sample with the expectation of those bound to alkaline ions. The hydrogen ion can be either attached to acids or in the form of free ions or anions. Titratable acidity is different than total acidity although at times both terms are used to mean the same thing total acidity is the total amount of organic acids in the food sample. This all acids (tartaric, oxalic acid, citric acid, sulfuric acid, lactic acid

BS1003 – Organic Chemistry Practical 1 Laboratory Report Name: Tristan Chan Yew Kit, U1640436J (T8) Effects of Dichloromethane(DCM) in Extraction of Caffeine from Tea Leaves Purpose To investigate the ability for Dichloromethane(DCM), a moderately polar organic solvent, to extract aqueous caffeine molecules, originating from Tea Leaves suspended in water. Introduction Caffeine, defined chemically as 1,3,7-trimethylxanthine (C8H10N4O2), is an alkaloid that can be found in tea leaves, coffee and many

Synopsis This experiment is the determination of Calcium Carbonate (CaCO3) content in toothpaste with the use of back titration while demonstrating quantitative transfer of solids and liquids. A accurately weighed quantity of toothpaste was dissolved in excess volumes of HCl. This solution is then titrated with NaOH to find the volume of the excess HCl. The volume of HCl reacted, which is found by substracting the volume of given HCl with the volume of excess HCl reacted, can be further manipulated

experiment was titration and is used to determine the concentration of an unknown solution by reaction with a known concentration of solution. In a titration, the titrant is placed into the burette and the analyte poured into the conical flask using a pipette. Titration involves adding a small amount of titrant slowly to the analyte to achieve the equivalence point. The equivalence point is when the moles of standard soluton are same as the solution of unknown concentration and is produced at a pH of 7

Living organisms are very complex as there are many different functions occurring simultaneously throughout the day. One of these functions is called Osmosis, and besides carrying nutrient rich liquid across cell membranes, an important task of Osmosis is to maintain an ideal concentration of solute within the cell. This means that it helps maintain a stable internal environment in an organism by equaling pressure and allows the absorption of nutrients. Many things alter the rate of Osmosis, like

determine its accuracy and precision. The volumetric glassware are burette, pipette and volumetric flask. Each calibration were repeated three times in order to gain a more precise result. In part A, pipette calibration was done. This was done whether the volume transferred from the pipette is exactly of what was shown

final average mass recorded was 33.73g. The volume of distilled water needed was calculated from the mass of water using the density= 0.9971g/mL in Section B. The volume of water needed was transferred using pipette, graduated cylinder and Erlenmeyer flask respectively. In Section C, a pipette was calibrated by measuring the water temperature and the density was determined. The average mass of water was calculated and the reading was 20.68g. The value for the relative average deviation was 5.33%

Macromolecules like carbohydrates and proteins are organic molecules that support life. Enzymes are needed to break carbohydrates down into simpler components that can easily be used for energy. However, enzymes are very specific and only react to certain substrates, as shown by part A of this lab, where glucose trinder was exposed to glucose, galactose, mannose, and lactose, but only reacted with glucose. To show how pH can have an effect on enzymatic reactions, lactose was exposed to lactase at

The purpose of the experiment was to figure out which means of measurement was more accurate in reaching the proposed weight, the graduated cylinder or the pipette. Two new terms that were mentioned and crucial to the project were standard deviation and reproducibility. Standard deviation was a new term for me in the case that I had never used it in science before only in math classes, I did not understand why the difference between the data collected and the mean was important but now I see it is

change over natural particles into different items. For biofuels, the run of the mill valuable maturation items is ethanol and butanol, both of which can be utilized as fluid transport fuels Yeasts can be used to deliver ethanol. The serological pipette is much of the time utilized as a part of the research facility for exchanging milliliter volumes of fluid, from under 1 ml to up to 50 ml. In light of past information of maturation movement, it can be presumed that a test tube containing a more

Soap’s Effect on The Surface Tension Of Water By: Lusinda Garcia Biology I - Pre-AP December 10, 2017 Introduction Surface tension is when the surface of a liquid that’s in contact with gas, acts like a thin elastic sheet. Water has a high level of surface tension, which means that when the molecules on the surface of water are not surrounded by similar molecules on all sides, they're being pulled by cohesion from other similar molecules deep inside. These molecules bind to each other strongly

volumetric pipette, its pump, and 10 mL volumetric flasks. Eight different solutions were produced, half of which came from Red 40 and the other half, from Blue 1. These different concentrated solutions were placed in a 10 mL volumetric flask, each labelled with either R for Red 40

Next, add 20 milliliters to the flasks marked two and three. Pipette 10 milliliters of enzyme extract from flask one to flask two making a 1:3 solution of water and enzymatic solution in flask 2. Next, Pipette 10 milliners of flask twos 1:3 solution into flask three creating a 1:9 dilution. Remove 10 milliliters of diluted enzyme from flask three and

The aim of this lab is to determine the concentration of a potassium hydrogen phthalate solution (HKC8O4H4) using acid‐base titration. Introduction: Titration is a technique that chemists use to determine the unknown concentration of a known solution (we know what chemical is dissolved, but not how much in a solution). Because we know what the chemical is, we know how it will react with other chemicals and we can use that reaction to determine the concentration of the solution by measuring the formation

centrifuge tube with brine solution. Two layers were formed, with a yellow layer on top and the clear bottom layer. The bottom layer is the only organic layer because it is denser. NaHSO3 was used to washed the mixture. The bottom layer was extracted by pipette and rinsed with NaSO4 for drying. The organic layer was transfer into a vial and placed under NEVEP to attain a solid product. The product was a mixture of white solids with liquid.

Pipetting accuracy not only depends on the conditions of the lab pipettes, but also on our pipetting technique. The way to know whether our pipetting is accurate is repeat the steps for many times. Then, the standard deviation is calculated and this is our pipetting errors. In this practical, since our standard deviations are zero, this means our pipetting was accurate. The accuracy can also be determined by comparing the expected mass with the mean mass that gained in practical. For the volume of

and a molarity of 6.00 M was transferred into a 125-mL Erlenmeyer flask using a volumetric pipette. Sodium hydroxide solution with a volume of 6.00 mL and a molarity of 3.00 M was transferred into a 50 mL beaker using a volumetric pipette. While swirling the phosphoric acid solution in the Erlenmeyer flask, the sodium hydroxide solution was added to it a few drops at a time using a disposable plastic pipette. The After all the sodium hydroxide was transferred, the flask was rinsed with 2 mL of deionized

Then, the pipet was rinsed with distilled water. The bulbs were then attached to the pipette; filling and dispensing water were practiced using both bulbs. Furthermore, the 250-mL beaker was weighed, and its mass was recorded. After that, the Erlenmeyer flask was filled with 100 mL of distilled water. The temperature was recorded. Using the pipette, 25 mL of the distilled water from the Erlenmeyer flask was filled and dispensed in the beaker. The mass of the beaker

150 mM KCl and low [Ca2+] (see methods), to set the membrane potential near 0. Figure XA shows two records of 30 s long showing the channel activity in an oxaliplatin treated neuron in the presence of 1 M of icilin and of 1.5 mM of [Ca2+] in the pipette solution at Vm= 40 mV (upper trace) and -40 mV (lower trace). Single channel currents were outwards at positive voltages and inwards at negative voltages as expected for a non-selective