Pipette

Sodium diethyldithiocarbamate, limiting equivalent conductance (Λ0), ion association, activation energy and thermodynamic functions. Introduction: The measurement of electrical conductivities of dilute solutions of salts or complexes is considered to be one of the important methods for studying the ion-pair or multiple- ion association not only in aqueous solutions but also in non-aqueous or mixed ones 1-4. Also, conductivity measurements were used to evaluate the hydration free energy of some…

1.0. Synopsis The objective of this experiment is to use the gravimetric method to determine the concentration of sulfate. Gravimetric analysis is a method used to determine the mass or concentration of a substance by measuring a change in mass. To determine the concentration of the sulfate, the precipitation of Barium sulfate is done first by adding the sulfate solution with hydrochloric acid, then heating while stirring it. Next is the washing and filtration of the Barium Sulfate precipitate,…

Introduction Enzymes are proteins that are biological catalysts that increases the rate of chemical reactions (JRank Articles). With the use of enzymes it can accelerate certain reaction rates at a faster past then if the reaction was moving at it natural speed (JRank Articles). The activity of enzymes are control by many things like environment, inhibitors, and regulatory binding sites that happens on the enzyme(JRank Articles).The overall reaction in the natural setting which was the basic…

are transferred you rinse the beaker and funnel into the volumetric flask. • You then add distilled water until the water level is close to the mark (100cm3). To make sure the distilled water is touching the bottom of the meniscus, you can use a pipette to add tiny drops. • The lid should then be placed as now you have to shake the solution well to dissolve the tiny particles of NaOH in the flask. The standard solution is ready to be used now. • At this stage you can find out the exact…

Water Hardness EEI Water is a covalent molecule and is formed between one oxygen atom and two hydrogen atoms. This is because oxygen needs to gain two electrons to become like neon and hydrogen needs to gain one electron to become like helium so they share electrons for each hydrogen atom and the oxygen atom ‘consider’ that they have achieved the noble gas configuration. This covalent bond forms a bent shape in order to share the necessary electrons. Water has many unique properties, one of…

that cannot be converted to melanoidin pigments. Sources of error  Quality of ingredients / raw materials: there maybe contamination or spoilage problem of the materials leading to an error  Equipment limitations/ calibration limitations: the pipette may not be calibrated properly or the instrument is unable to take measurement because of calibration…

To begin this experiment, make sure that the laptop computer is turned on and connect the Conductivity Probe to the computer interface. Set the Conductivity Probe to the intermediate setting, 2000 μS/cm (0 to 1000 mg/L TDS). Open the file “01A Membrane Diffusion” from the Advanced Biology with Vernier folder of Logger Pro to prepare for data collection. The first portion of this experiment will test whether the different concentration gradients affect the rate of diffusion. Three different…

Discussion According to the hypothesis, the fresh Navel orange juice was expected to have a higher concentration of vitamin C than Coles orange juice However, according to the results, as seen in Graph 2, Coles Orange juice had higher concentration of vitamin C compared to the Fresh Navel orange juice, and contradicted the hypothesis. From Graph 2, at 8oC, Coles orange juice had 19.7% higher concentration of vitamin C than fresh navel orange juice, because fresh juice had 15.62mg/100mL, whereas…

Analysis of aspirin tablets Purpose: Determine the percentage of 2-ethanoylhydroxybenzoic acid in aspirin tablets. Introduction (including background information) : Before creating Aspirin, “sail alba” was used. In 1860’s, chemists discovered that Salicylic acid (2-hydroxybenzoic acid, C7H6O3 ) is the active acid in sail alba. Salicylic acid is relatively strong though. It can irritate and damage the stomach membranes and mouth. In 1889, ethanoate ester of salicylic acid was introduced by the…

Literal Shit IVF stands for in-vitro fertilisation and is usually used to treat a variety of infertility problems, but can also screen embryos for genetic disorders (PGD) in normally fertile couples. It was originally developed to treat infertility caused by blocked or damaged fallopian tubes. IVF was the first assisted reproductive technology and therefore has the most experience behind it (over 20 years). PGD stands for pre-implantation genetic diagnosis and the testing can increase both the…