SI base unit

The current standard for the kilogram is the International Prototype Kilogram. The International Prototype Kilogram, also known as Le Grand K, is a platinum-iridium bar made in the 1880’s. This official Kilogram is kept in a vault in Paris under two glass domes. The reason it is under 2 glass domes it to prevent dust from obstructing from the weight of the Kilogram. However according to Sandia National Laboratories, a government organization under the Department of Energy, “Of the seven units of measurement in the International System, or SI, the kilogram is the only base still defined by a physical object. In addition, copies of the kilogram have changed over time by either gaining or losing weight as compared to the standard kilogram.”(DOE/Sandia…

donor. An equation exemplifying an acid dissolving in water is: HCl (g) H2O H+ (aq) + Cl- (aq) A base, based on the Bronsted-Lowry Theory, is defined as a proton (H+) acceptor. An equation exemplifying a base dissolving in water: NaOH (s) H2O Na+ (aq) + OH- (aq) Molarity, also known as the concentration, is represented as moles of the measured substance divided by the volume in dm3. It is a value of the amount of substance in a given volume. The amount of substance is measured…

more extensive and intensive tests should be done to confirm the results. When looking at the Paste pH and Electrical Conductivity Tests, we are looking for an acidic environment and an environment with a high concentration of salt. Specifically, if our site sample has a pH of less than 4, then that indicates that the sample is acidic. If our site sample has an electrical conductivity greater than 2000 μSiemens per centimeters, then that indicates that the sample has a high level of soluble…

has been removed. Washes operate on the idea that adding base and acid to a mixture will draw out the acidic and basic substances contained in that mixture. Acids are defined by their need to donate a proton. Bases are defined by their need to take in a proton. Therefore, adding a strong acid to a mixture would cause the base in the mixture to want to take the protons from the acid8. Similarly, adding a strong base to a mixture would cause the acid in the mixture to want to donate its proton8.…

Introduction: Alka-Seltzer is a medication used to alleviate ailments such as heartburn and acid indigestion1. The ingredients that the tablet is made up of helps explain the name of the medication, the sodium bicarbonate is used to balance stomach acid, help spread the aspirin which allows the speed of absorption to increase, and reacts with citric sodium which produces carbon dioxide2. One initial observation of the Alka-Seltzer tablet and water is that when the tablet was dropped into the…

Since acetic acid is considered a weak acid (strong within the scale of weak acids), there is a range at which the acetic acid and acetate will form a stable buffer. Using the Henderson-Hasselbalch equation for buffers, it’s possible to calculate the pH based on the ratio of acid to conjugate base, or calculate the ratio given the pH and pKa value. Finding charge on a protonated amine: The pKa value given for the amino group on any amino acid specifically refers to the equilibrium between the…

INTRODUCTION 1.1What is an acid-base titration? An acid –base titration is the determination of the concentration of an acid or base by neutralizing the acid or base with an acid or base of known concentration. An acid-base titration is the analysis of the concentration of acids and bases; through this process an acid or base of known concentration neutralizes an acid or base of unknown concentration. The neutralization of an acid or base in acid-base titration can be measured with either a…

4.0 INTRODUCTION TO RESULT AND DISCUSSION This chapter covers the result and also the discussion on the experiment of lab scale soap production. All of the findings which are the analysis of pH value, saponification value and moisture content of the formulation soap bar is discussed thoroughly throughout the chapter. 4.1 RESULT AND DISCUSSION The purposes of the experiment were to identify the weights of materials to be used in the formulation of soap and also to produce the average quality…

TRIS Hcl, NBT, NADH, Ethanol, PMS, l-ascorbic acid 1. The superoxide radicals is generated in 3 ml of TrisHCl buffer (16 mM, pH 8.0) containing 1 ml of NBT (50 μM), 1 ml NADH (78 μM) and ethanol extract of sample (25 – 50 μg). 2. The reaction was started by adding 1 ml of PMS solution (10 μM) to the mixture. 3. The reaction mixture was incubated at 25° C for 5 min, the absorbance was read at 560 nm using a spectrophotometer (Schimadzu UV-Vis 1700) against blank samples using l- ascorbic acid…

Abstract: The purpose of this experiment was to prepare and standardize a sodium hydroxide solution as well as determine the molar concentration in as strong acid and the percent by mass of acetic acid in vinegar. We used volumetric analysis, also known as titration, in both experiments. The average molar concentration for NaOH was 0.2749 mol/L while the average molar concentration of the acid solution was .2493 mol/L.The average percent by mass of acetic acid in vinegar was found to be 12.3 %…