Heat of Combustion of Magnesium Background: The students were given full instructions on how to experimentally determine the enthalpy of reaction (ΔHrxn) for the combustion of magnesium ribbon‚ using Hess’s Law. Data Collection: | |Reaction 1 |Reaction 2 | | |(MgO) |(Mg)
Free Thermodynamics Enthalpy Entropy
delivery of 23 ml. of titrant Part A) Reaction is: HNO2 + OH- NO2- + H2O Ka for Nitrous acid = 7.2E-4 Kw = Ka*Lb Kb = 1.0E-14/7.2E-4 Kb = 1.38E-11 Moles of base: (0.15)*(0.022) = 3.3E-3 moles 1:1 Ratio‚ So‚ Moles of acid = 3.3E-3 moles NaOH: (0.005)*(0.15) = 7.5E-4 moles HNO2: 3.3E-3 – 7.5E-4 = 2.55 E-3 moles Using Henderson- Hassel Balch equation: Ph = 4.752 + log(7.5E-4/2.55E-3) Ph =4.21 Part B) Ph = 4.752
Premium Sodium hydroxide Base Acid
neutralization reaction is caused by the combination of H3O+ and OH- ions. In order to determine the concentration of an unknown acid and base‚ a method called acid-base titration is used. The end of the titration has been reached when the moles of acid equals the moles of base. This is called the equivalent point. However‚ end point os the actual point that is reached in neutralization reaction. End point is signalled by the change in color of the solution because of the presence of pH indicator. The
Premium Titration Sodium hydroxide
methods. Theory: This experiment requires us to use both the Gravimetric and Volumetric methods in order to acquire our percent composition. Since all gasses at Standard Temperature and Pressure contain one mole for every 22.4 L of gas‚ we can use stoichiometry to figure out how many moles of reactant we began with. Considering the room is at constant temperature change‚ the volume of the gas varies. Thus we convert the volume of gas used to STP conditions. Procedure:All means and materials were
Free Gas Pressure Chlorine
Producing Isoamyl Acetate from Isoamyl Alcohol and Acetic Anhydride through Esterification Racquel Erica D.G. Isada‚ Jannah B. Juan*‚ Moses Isaiah L. Koh and Hedder A. Lim Department of Biology‚ College of Science University of Santo Tomas‚ España Street‚ Manila 1051 Date Submitted: August 13‚ 2014 Abstract: In this experiment‚ the synthesis of Isoamyl acetate from Isoamyl alcohol and Acetic anhydride was prepared with the process of Esterification. By using the reflux technique‚ extraction
Premium Ester Carboxylic acid Acetic anhydride
large amount of solute‚ or dilute if contains a small amount. Molarity Molarity is the number of moles of solute per litre of solution. It is abbreviated with the symbol M‚ and is sometimes used as a unit of measurement‚ e.g. a 0.3 molar solution of HCl. In that example‚ there would be 3 moles of HCl for every 10 litres of water (or whatever the solvent was). Molality Molality is the number of moles of solute per kilogram of solvent. It
Premium Solubility Solution Concentration
ANALYSIS OF ASPIRIN TABLETS The aim of this investigation is to determine the percentage by mass of aspirin aspirin present in different commercial preparations and to find out‚ which the best value is‚ using a neutralization reaction followed by a direct titration with NaOH. Chemicals Used: 100 ml of distilled water in a wash bottle 50 ml of 0.100 M NaOH 40 mL of 96% ethanol phenolphthalein as an indicator (3 drops per titration) 325 mg non buffered aspirin tablets Materials Used: One
Premium Titration Erlenmeyer flask
chaos occurs and bad things happen when the Stoats and Weasels overtake Toad Hall. The Stoats and Weasels disliked Toad‚ and didn’t want him to return. Despite what the stoats and Weasels though Mole‚ Rat and Badger stood up for Toad‚ they knew Toad would return somehow and hoped that he would. Badger and Mole stayed out keeping an eye on Toad hall‚ trying to figure out what the Weasels were doing and planning ways to win back Toad hall. "Those two poor devoted animals have been camping out in the open
Premium Fiction Character Wuthering Heights
Experiment 10: How much CO2? Introduction The goal of this lab was to determine the amount of grams of sodium bicarbonate (NaHCO3) required to produce enough CO2 gas to completely fill the lab and also how many Alka-Seltzer tablets that would equate to. This was done by collecting CO2 gas by inverting a buret and submerging it under water in order to calculate the volume of CO2 released from a fragment of Alka-Seltzer tablet. The main component of Alka-Seltzer is sodium bicarbonate‚ used to neutralize
Premium Chemistry Temperature Water
CALORIMETRY Abstract: During the experiment‚ the group were able to perform the following objectives; to compute the heat capacity of a Styrofoam-cup calorimeter‚ and also to compute the heat of neutralization of 1.0 M hydrochloric acid and 1.0 M sodium hydroxide‚ the heat of dilution of concentrated sulfuric acid‚ and the heat of solution of solid ammonium chloride The sixth experiment was named "Calorimetry" wherein it is the measurement of how much heat is gained or released by a system
Premium Energy Enthalpy Hydrochloric acid