Physical constant Essays

Believe it or not- We all need a little bit of astrology in our lives! Astrology is a peculiar yet intriguing science that has baffled many enthusiasts. Be it for a work related scenarios or everyday travel, it is not unlikely that a lot of us flip through channels or scour through newspapers just to find out how the day is supposed to pan out. A positive prediction and we are happy beyond limits. A negative one, probably exercising caution should work out! In any case astrology has become an integral

equilibrium, the following chemical equation is used in the experiment: Fe3+(aq) + SCN-(aq)  FeSCN2+(aq). When iron (III) and thiocyanate react, thiocyanoiron (III) is produced. When the concentration of all ions at equilibrium are known, the equilibrium constant can be calculated by dividing the equilibrium concentration of the reactant by the equilibrium concentration of the products. In this experiment, four equilibrium systems containing different concentrations of three different ion types (Fe(NO3)3

There are many corrupt things in the world we live in. At times, we are oblivious to the fact that these corruptions exist. There are some who even get involved and easily influenced by these immoral things or people. There is always that little voice in your mind that advises you to not follow the wrong path. It could be at that moment you where have to decide or later on as a dream. Connie, in Joyce Carol Oates’s “Where Are You Going, Where Have You Been,” encounters this experience, and falls

Experiment 2: Preparation and Spectrophotometric Analysis of Copper(I) Iodide Abstract: This experiment aims to determine the concentration of “Purified CuI” sample. Crude CuI is obtained by reacting CuSO4.5H2O with KI and Na2S2O3 in de-ionized water. A series of decanting and centrifugation is carried out to extract the crude CuI. Crude CuI was later purified by dissolving it in hot KI solution. The solution was later transferred into de-ionized water and placed in an ice bath to allow for re-precipitation

Lab Report Experiment 6 Rates of Chemical Reactions By Nikhola Mirashirova Lab Partner: Dina Abetova Section 3, Saturday October 31, 2015 Introduction Rate reaction is the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.1,2 Rate law for this experiment: Rate = k(I-)m(BrO3-)n(H+)p There are several factors which affect the rate of reaction: catalyst, reactant concentration, and temperature.1

identify the suitable indicators for different titrations. 3. To identify the unknown acid. 4. To determine acid dissociation constant, Ka and pKa for the unknown acid. Introduction: Titration process is used in an acid-base experiment in order to determine the concentrations of solutions of acids and bases. Through the titration process, we are able to identify physical changes to the mixture such as the colour change to indicate the end point of the experiment. For example, the colour changes of

3. Results and discussion 3.1. Coagulation performance of CB[8] for HA removal The effect of the CB[8] dosage on HA coagulation in the absence of added salts in the synthetic water (fresh water) was investigated at pH 7.5. When the CB[8] dosage was less than 0.2 mmol/L, flocculation was not observed during coagulation. The HA removal efficiency was less than 50% (Fig. 1a). When the CB[8] dosage was higher than 0.2 mmol/L, considerable amounts of flocs formed. At a CB[8] dosage of 0.3 mmol/L, the

The purpose of the K_a determination of an unknown weak acid lab was to use titration in order to determine the K_a for an unknown solid weak acid knowing only its molar mass. The previous laboratory experiment was performed in order to determine whether titration or dilution would yield more accurate K_a. It was determined that titration yielded more accurate results. This lab was performed by taking a sample of solid weak acid and dissolving it in water before titrating with the strong base NaOH

In acidic aqueous solution, a buffer is formed by the dissociation of the acid: HA ⇄ H+ + A- Hence, when acid is added, the excess H+ reacts with the A- to form more HA, lowering the pH and minimising the effect of the addition of acid. When alkali is added, the OH- reacts with the dissociated H+ to form water, which reduces the effect of the alkali by restoring the pH to normal levels. Alka Seltzer acts as a buffer because the citrate ions in solution (C6H5O73-) are able to react with H+ when acid

Introduction In this report, an unknown concentration of phenol red and the pKa of an acid were determined. The unknown concentration of the phenol red was determined by using Beer’s Law (A=εbc). According to Beer’s law, the absorbance of a compound is proportional to its concentration. The absorbance of several standard solutions were measured by a spectrometer, and these results supported Beer’s Law. The pKa of an acid was determined by the Henderson-Hasselbalch equation (pH= pKa+ log ([A-]/[HA])

Introduction Buffer is a solution that resists a change in pH when bases or acid are added. Solutions that are acidic contain high concentrations of hydrogen ions (H+) and have pH values less than seven. Buffer usually consist of a weak acid, and its conjugate base or a weak base and its conjugate acid. The function of buffer is to resist the changes in hydrogen ion concentration as a result of internal and environmental factor. This buffer experiment is important so that we relies the important

Lab report: How does the surface area affect the rate of reaction ? Introduction The rate of a chemical reaction (or reaction rate) is a calculation of the total time needed for a reaction to take place, or how quickly the reactants are transferred into products in a chemical process. This rate can be measured in two methods. The first one is to measure the rate at which the reactants are used up per unit of time, while the second method is to measure the rate at which the products are formed

Procedure Before conducting any experiment, it is important to wear safety goggles to ensure protection for the eyes. With the objective of differentiating the two unknown substances, the ideal method to determine which substance is an acid or base was utilizing litmus paper. After a few drops of the first substance, on one half of the litmus paper, no colour change was observed. It was concluded that the second solution would be the acid or base. To determine whether it was an acid or base, a few

Spectroscopic Determination of the pKa of Bromothymol Blue Andrea Myer May 27, 2023 Kevin Huang, CHEM 241L, Section 402 I pledge that I have not used someone else’s old or current lab when writing this lab report. I pledge that I did not collaborate with any other students, except where allowed, and that the report I submitted here contains my own ideas, thoughts, observations, calculations, data, conclusions, and answers. Lastly, I pledge that the data represented in this report was my own

Introduction On Monday, in class, we executed an experiment. The objective is to… Problem Question Before completing the experiment I have to choose a problem question. I have decided to answer the following question to solve a problem; which of the three unknown concentrations of acid is the strongest? I have chosen this problem question because it is a fulfilling question based on the aim of this experiment. To substantiate the question with background research before completing the experiment

Explain the relationship between the ionisation of amino acids and pH |Structural diagram of the neutral structure| |Structural diagram of positively charged structure| |Structural diagram of negatively charged structure| Explain how the form of an amino acid, whether positively charged, negatively charged or neutral, depends of the pH of the solution ? If you increase the pH of a solution of an amino acid by adding hydroxide ions, if this is done then the hydrogen ions will then

The purpose of this experiment was to create two 40 mL buffers and evaluate its buffer capacity at pH 4. To do this, buffer #1 consisted of the mixture of 0.5003 M acetic acid and .50 M sodium acetate, while buffer #2 consisted of the mixture .5003 M acetic acid and .4289 M NaOH. Within each mixture, there is a ratio of conjugate acid to conjugate base. By using the Henderson Hasselbalch equation, the volume for the base and acid to buffer the pH of solution at 4.0 were calculated. Two titration

and Celite. A second type of packing material is called pellicular, consists of small beads coated with layer of a porous material such as silica gel, alumina or ion exchange resin. 6. Detector This detector is used for measurement of specific physical and chemical properties of the column effluent. The most common detector used in pharmaceutical analysis is UV, which allows monitoring and continuous measurement of the UV absorbance at a selected wavelength. Appearance of the analyte in the detector

The 20th century brought an explosion of new chemical products for consumers. Chemicals bring about benefits upon which modern society is entirely dependent. From 1 million tons in 1930 to several hundreds of million tons today, the global production of chemicals has a significant increase. The chemical industry continuously converts raw materials, such as oil, natural gas, air, water, metals, and minerals into thousands of different products. Chemical products are used at work or even at home every

There are at least 5 basic physical-chemical and thermodynamic principles learned from the cheese-cracker experiment. List 5 of them, explaining clearly what they mean as if you were teaching someone. (10 points) The cheese and cracker experiment is based on a non-homogenous system