Avogadro constant

Title: “The Effect of Substrate Concentration, Enzyme Concentration, pH and Temperature on Enzyme Activity” Abstract: In the following experiments we will measure precise amounts of potato extract as well as Phenylthiourea, combined with or without deionized water and in some instances change the temperature and observe and record the reaction. We will also investigate the different levels of prepared pH on varying samples of the potato extract and the Phenylthiourea and record the results.

The purpose of this lab was to determine the pH and total acidity of grape juice and wine. A second purpose was to experimentally determine the pKa of a monoprotic weak acid, polyprotic weak acid, as well as, a free amino acid, alanine. Acids and bases were defined by Bronsted-Lowry in 1923, in which acids were described as substances capable of donating a proton and bases are substances capable of accepting a proton (Thompson and Dinh 2009). In addition to defining acids and

PLANNING Investigating the Kinetics of the reaction between Iodide ions and Peroxodisulphate (VI) ions By the use of an Iodine clock reaction I hope to obtain the length of time taken for Iodine ions (in potassium iodide) to react fully with Peroxodisulphate ions (in potassium Peroxodisulphate). I will do three sets of experiments changing first the concentration of iodide ions, then the concentration of Peroxodisulphate ions and finally the temperature of the solution in which the reaction

CHM 116 Lab Investigations of Buffers I. Purpose The purpose of this experiment was to get an understanding as to how to properly prepare chemical buffers. Also part of this experiment was to gauge the effectiveness of the buffers by measuring their pH levels in various titration solutions, using a pH meter. II. Procedure To start our experiment we had to prepare Buffer B, which was the .060 M Ammonia/Ammonium solution. Using 3.0 M ammonia, we had to calculate

Purpose: The procedure of this lab is to determine if liver and potato cells contain natural buffers that resist large change in pH as 1. NaCl or 1. NaOH are added to the solution. Hypothesis: If adding an acid or a base to liver and Potato cells then the solutions will become buffers. Materials: pH paper- cut into chunks 0.1 Molar NaCl 0.1 Molar NaOH Commercial Buffer Solution- pH 7 Liver homogenate- 10g per 100mL of water Potato homogenate-10g per 100mL of water 25 mL graduated cylinder 50mL

Practical Exercise 3 – Buffers and Titration of An Amino Acid Name: Stephanie Tayas Anak Bumphray Id Number: 100084790 Date Performed: 11 September 2017 Practical Group: Monday 1:30pm – 5:30pm Introduction: A buffer solution is which resists large changes in pH when the small amounts of an acid or a base are added to it. The buffer can be calculated based on the equation of ionization pair of acid and conjugate base. Any weak acid can be represented as “HA” and "A-" as the

During this lab, the main focus was on making accurate and precise metric, and pH measurements. The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution. A buffer is a solution that can resist pH change when adding acidic or basic components. The main function of buffer is to neutralize small amounts of added acid or base, which maintains the pH of the solution relatively stable. It has the ability

Results **Annotated Figures 1-5 were sourced and calculated from the cumulative results of the BIOL2029: Cells, Wednesday lab section** Light intensity on pellicular movement: Figure 1: Represents the mixture of Euglena culture, and the percentage of rounded cells noted at an increasing light intensity. Rounded cells in this experiment were identified as pear shaped. Analysis of colour active light signal: Figure 2: Identifies the percentage of rounded Euglena cells subjected to a

Specimen Collection In this analysis the type of urine specimen used is random urine which is collected any time for routine analysis. A routine voided urine specimen requires no patient preparation and is collected by having the patient urinate into an appropriate container. Normally the patient requires no assistance other than clear instructions. For other collection procedures, the patient may require assistance depending on the patient’s age and physical condition or the technique to be used

For this experiment, The scientists are testing the pH level of salt ( NaCl ) by putting water, measuring the pH, and then adding salt and checking the pH after. The scientist want to evaluate how acidic or how much of a base the salt is. The independent variable would be the salt. The dependent variable would be the pH level. The control would be the pH before salt is added. If the scientists add salt to pure water, then pH level of the water will drop turning the water acidic. In the experiment