Purpose The main objective of this lab is to use qualitative analysis to understand and recognize the chemical properties of certain Group 1 cations, which are Ag+, Pb2+, and Hg2+, and to use their inherent properties to identify whether they are present in an unknown sample. These three particular cations, known as the Silver Group, can be separated and isolated from each other by forming insoluble chloride salts. Introduction Chemistry is an analytical science, which is based heavily on experimentation and observation. The data that can be obtained through experimentation can be separated into two distinct types of data: qualitative and quantitative. Quantitative data deals primarily with numerical characteristics, such as the weight or amount of a particular substance.
Introduction In Chemistry 1211 lab the main objective was to identify the name of the unknown acid #2651145-PLF13 that was issued by the instructor. Melting point, titration of the unknown acid, calculation of equivalent weight, pKa, solubility tests, and properties of a hydrochloric acid; these procedures were used to characterize the unknown acid and then compared with known substances using GSU Chemistry department search engine. By doing this experiment he or she will develop an understanding of the properties of organic acids and differences between properties of a strong acid such hydrochloric acid. Experimental The first procedure to identify the unknown organic acid was finding the correct melting point. This was done by taking small amounts of the unknown acid.
Some of the colors were similar but salt solution had its own distinct differences. Flame tests are the best way to determine the color a solution will emit. “Flame tests are a quick method of producing the characteristic color of metallic ions. The colors seen are a combination of the wavelengths of each transition.” Introduction 2: “An atom can react with another atom to form a compound through either a sharing or transfer of electrons in an interaction called bonding.” An Ion by definition is “an electrically charged atom or group of atoms. Metals on the left side of the table, tend to form
Titration lab report Chemistry unit 3 Abstract In this investigation it was looked at the titration of HCL with NaOH, this is a neutralization reaction that is performed in lab in order to determine an unknown concentration of acid (HCL). In this investigation the moles and concentration of acid as well as the Ph of the solution were find out, the mole of 25ml of HCL was 0.65, concentration was 0.026 and the Ph of solution was 1.58Ph. Introduction Titration is a process to measure the volume of an end product, which is produced by reacting a solution of known concentration with a measured volume of a solution of an unknown concentration. The known concentration solution is called a standard solution, it will be added from a buret to allow measure the amount of solution which is added. The solution that is added by buret also called titrant.
What would you expect to happen if a solution of sodium benzoate was acidified? Write an equation. If a solution of sodium benzoate was acidified, Na in sodium benzoate solution will displaced by the H+ from the acid and thus producing benzoic acid. (C6H5)COO-Na+ + H2O/H+ → (C6H5)COOH + Na+ + OH- 3. Use your answers to Questions 1 and 2 to explain how a water-insoluble organic acid might be freed of non-acidic impurities.
This standardized solution of sodium hydroxide can then be used to determine the concentration of acid in the sample of gastric juice. Acid-base titration is when a titration is carried out with a known volume of a strong acid which in this case is HCl, of unknown concentration, with a standard solution of a strong base NaOH. The reaction taking place is: HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(aq) A titration can be used to find the concentration of an acid in gastric juices because the acidity in the gastric juices is mainly caused by hydrochloric
The metal must then be recovered and the waste discarded. This can be done by leaching, separating the separating the waste and purifying the leach solution, then precipitating the the metal or one of its pure compounds from the leach solution by chemical or electrolytic mean. Once this process is done, it can be determined if the sample is actually chromite or not. If the sample contains, magnesium, iron, and chromium, then the sample is indeed chromite. However, if the sample does not contain all of these, then it cannot be chromite.
Chromite is iron magnesium chromium oxide. In some rare cases, magnesium is substituted for iron. Also aluminum and ferric ions can substitute chromium in a reaction. Hydrometallurgy is a form of extractive metallurgy that utilizes aqueous solution chemistry for the recovery of metals from salts, minerals, or ores. Extraction is a process in which metal is removed from an ore by dissolving the metal in a solvent, then recovering the metal from the solution (This is done by dissolving the metal into an acid or water).
As for endothermic the reactions pulls in energy and makes it cold to touch. The other experiment measured the pH level in the reaction. The reaction consisted of sodium hydroxide and hydrochloric acid also to see at which point the reaction becomes neutralized. Neutralization is a reaction between an acid and a base forming a salt and water even tho you can’t see the salt due to the salt dissolving into the solution and the pH level of the reaction around level 7 and has a green sometimes yellow colour when the universal indicator is added. The neutralization gap shows how small the gap is to make the reaction neutral.
Title Page Experiment Title: Experiment 4: Qualitative Analysis of Cations III – Mg2+, Ca2+, Fe3+, Ba2+. Aim To determine the presence of the cation II , Mn2+, Ni2+, Fe3+, (Fe2+), Al3+, Zn2+ by using separation method to confirm the presence of cation II in the test solution. Procedure Please refer to the laboratory manual page 30-31. Results Procedure Number and Ion | Test Reagent or Technique | Evidence of Chemical Change | Chemical(s) Responsible for Observation | Equation(s) for Observed Reaction | 1 | Centrifuge the solution. | A brown precipitate was formed.