Mole

measures the transmittance and absorbance of a solution, learn about the linear relationship between absorbance and concentration known as the Beer- Lambert law and use the equation involving moles, volume and molarity. Molarity is a unit used in chemistry to measure the concentration of a solution and moles are a specific amount of matter. The serial dilution technique…

Mole hurries to recover the disfigured body: “He tossed his gun to his A gunner, grabbed Hamilton’s body, and dragged it back to their original safe position” (485). Mole “dragged” Hamilton’s body back, showing disappointment and pessimism of the men. “Drag” is commonly used to describe an action done to inanimate objects; however, the…

burette reading (cm3) Final burette reading (cm3) Volume Used (cm3) Rough Titration 0.00 25.0 25.0 First Accurate Titration 25.0 50.0 25.0 Second Accurate Titration 0.00 25.1 25.1 Average volume of sodium hydroxide solution used = 25.1 cm3 Number of moles of NaOH present in this volume = 0.01 x 25 / 1000 = 2.5x10-4 Therefore, molar concentration of NaOH = 1000 / 25.1 x 2.5x10-4 = 0.00996 mol dm-3 Table 2 Titration of 25 cm3 gastric juice with the standardised solution of sodium hydroxide…

This experiment was performed in order to prepare the Grignard reagent from aryl or alkyl halides and demonstrate the principles of organometallic chemistry. The Grignard reagent was prepared via a radical mechanism. The Grignard reagent was then used to prepare a carboxylic acid from carbon dioxide, demonstrating its ability to create carbon-carbon bonds by acting as a strong nucleophile. As the R group of the Grignard reagent was unknown, molecular weight and melting point were then used to…

OBJECTIVE: The purpose of this lab is to determine the percentage yield of the reaction between sodium bicarbonate and acetic acid. INTRODUCTION This lab demonstrates the double replacement / acid-base neutralization reaction between the reactants of two household cooking items, baking soda and vinegar, producing carbon dioxide, water, and sodium acetate. Baking soda is an odorless, powdered chemical compound called sodium bicarbonate (NaHCOз). NaHCOз is most commonly used in baking as a…

Characteristics Melanoma is an abnormal spot on the skin. Melanoma is the most serious type of skin cancer. It develops in the melanocytes that produce melanin. Common characteristics of melanoma include growth of or an existing mole. Causes/ Risk Factors Melanoma occurs when something goes awry in the melanin producing cells. Skin cells develop when healthy cells push older cells toward the skin’s surface where they die. But when cells develop DNA damage, new cells grow out of control and…

the formula to calculate moles which is moles=Mass(g)/Molecular Weight. 3.Introduction- We must know about hydrated salts which are salts that contain water. We are trying to figure out the molar mass of the hydrated salt given to us. In order to do this we must heat up a hydrated salt so that it reverses the reaction and removes the water.We then are able to get the mass of the anhydrous salt and water. Then you place both results into the formula x=Moles of water/moles of anhydrous salt.…

chloride hydrate sample and using it for an elemental copper-producing chemical reaction, one can isolate the masses of the water, copper, and chloride and determine their mole ratios. Since the Law of Definite Proportions states that a chemical compound always contains fixed proportions of its constituent elements by mass, the mole ratios can be used to find the empirical formula of the copper chloride hydrate compound. When performed correctly, gravimetric analysis is one of the most…

Measuring the mass of Iron in an iron sulphate tablet using REDOX titration Aim The aim of this experiment is to determine the mass of iron present in one iron sulphate tablet using REDOX titration under acidic conditions. Safety H2SO4: This is an irritant which may cause burns on skin and eyes; therefore care must be taken when handling this chemical. Protective gear (gloves, lab coat and safety goggles) must be worn at all times. If it comes in contact with skin or eyes, it should be…

Number of moles = Volume x concentration 1000 Moles of sodium carbonate = 25 cm3 x 0.2 mol dm-3 = 1000 Moles of sodium carbonate = 0.005 mol dm-3 2. Concentration of sulphuric acid: In this equation, has you can see that the equation is in 1:1 ratio. This means that the number of moles of sodium carbonate at the end-point of the titration is the same as the number of…