Acid Determination of Vitamin C Tablets and Salt Solutions Chem 1290-016 03-05-2010 ------------------------------------------------- Purpose: The purpose of this lab was to use acid-base titrations to find the mass percent of ascorbic acid in a Vitamin C tablet. A known concentration of sodium hydroxide was used and the value found was compared to the stated amount of ascorbic acid listed on the vitamin container. Also in this lab the acidity of different salt solutions were tested using
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For this assignment you will research one of the equilibrium systems below‚ or one approved by your instructor‚ and prepare a presentation describing the system. The Haber Process (or Haber-Bosch Process) The Contact Process The Ostwald Process Begin by finding at least five different reliable sources of information about your chosen process. You may use textbooks‚ the Internet‚ or library books. These resources should be cited within your presentation and should be listed in
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SUMMATIVE ASSESSMENT –I (2011) Lakdfyr ijh{kk&I SCIENCE / foKku Class – IX / & IX Time allowed: 3 hours fu/kkZfjr le; % 3 ?k.Vs 470011 Maximum Marks: 90 vf/kdre vad % 90 General Instructions: (i) The question paper comprises of two sections‚ A and B. You are to attempt both the sections. (ii) All questions are compulsory. (iii) There is no overall choice. However‚ internal choice has been provided in all the five questions of five marks category. Only one option in such
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1 The Effect of Molecular Weight on the Rate of Diffusion of Substances1 Alexander Ken Libranza Group 1 Sec. A – 1L March 6‚ 2012 A scientific paper submitted in partial fulfillment of the requirements in General Biology I laboratory under Prof. Cheryl M. Talde‚ 2nd sem.‚ 2011-2012. 1 2 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using two tests: the glass tube test and the agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked
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EXPERIMENTAL PROCEDURE: 1. 2.07 g of the mixture of naphthalene and benzoic acid was weighed accurately on a balance. The mixture was then dissolved in 40 ml dichloromethane and the solution was poured into a separatory funnel. 2. 20 ml of aqueous sodium bicarbonate solution was added to the dichloromethane. A stopper was placed on the separatory funnel and was shaken and pressure was frequently released. The 2 liquids separated into clear layers and the lower layer (dichloromethane layer) was
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SALTS AND THEIR PREPARATION SALTS A salt is a compound formed when the hydrogen ions in an acid are replaced by metal ions or by ammonium ions. Compounds in which the H+ ions in an acid have been replaced by ammonium ions (NH4+) are called ammonium salts. NOTE: •An anion is a negatively charged ion. Hence:•Hydrochloric acid gives chlorides. E.g. sodium chloride‚ ammonium chloride. •Nitric acid gives nitrates. E.g. barium nitrate‚ copper nitrate. •Sulphuric acid gives sulphates. E.g. silver sulphate
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Process Description Acetaldehyde is produced via dehydrogenation of Ethanol. The reaction is as below: CH3CH2OH CH3CHO + H2 ‚ ΔH = +82.5 kJ/mol Besides the main reaction producing Acetaldehyde‚ there are three side reactions present in the reactor‚ as shown below: 2 CH3CH2OH CH3COOC2H5 + H2 2 CH3CH2OH CH3(CH2)3OH + H2O CH3CH2OH + H2O CH3COOH + H2O The feed of 90% Ethanol is kept in a storage tank with an air vent. Tank blanketing is used in the storage tank with Nitrogen gas. This
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Percent By Mass Solution Problems 1. What is the percent by mass of a solution made by dissolving 0.49 g of potassium sulfate in 12.70 g of water? 2. What is the percentage concentration of 75.0 g of ethanol dissolved in 500.0 g of water? 3. A chemist dissolves 3.50 g of potassium iodate and 6.23 g of potassium hydroxide in 805.05 g of water. What is the percentage concentration of each solute in the solution? 4. A student wants to make a 5.00 % solution of rubidium chloride
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The organic topic to be discussed: n-Nitrosamines The organic molecule to be discussed: n-Nitrosodimethylamine‚ Nitrosopyrrolidine During these few decades‚ more nitrogen-based chemicals‚ like nitrites and secondary amines‚ were added to our food‚ which lead to be a suspect reason of increasing Alzheimer’s cases. The nitrogen-based chemicals can be transformed into toxic chemical‚ n-Nitrosamines‚ under acidic environment or high temperature while cooking. Scanlan RA states that the most
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CHEM 2018 Organic Lab Part 2 Experiment 7: Diethyl n- Butylmalonate Lab Partner: Reference: Williamson K.L.‚ & Masters
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