Determination of Chlorine and Iodine in Water I. Introduction The purpose of this laboratory was to determine the amount of chlorine and iodine in a sample of water by titration using a starch indicator and to standardize a sodium thiosulfate solution. Chlorine is added to municipal water supplies to purify it enough to become safe to drink. Iodine is also added to water when people camp or go hiking in the back country where they cannot bring purified water along. Chlorine and iodine are
Premium Iodine
observe if the percentage composition is constant by comparing class results. Hypothesis/Prediction: The percent composition by mass of magnesium in magnesium oxide will not change significantly with each group that conducted the experiment. The composition of each substance should stay the same and any differences must be due to some error. Materials:Magnesium stripCrucibleCrucible coverClay triangleIron ringRetort standTongsBalanceBunsen burnerProcedure:1.obtained a strip of magnesium between 30-40
Premium Magnesium Oxide Magnesium oxide
ABSTRACT The average concentration of CaCO3 obtained was 212 ppm‚ with a standard deviation of 1 ppt. The results indicate that the unk B tap water can be considered as hard water. INTRODUCTION Hard water is due to metal ions (minerals) that are dissolved in the ground water. These minerals include Ca 2+‚ Mg2+‚ Fe3+‚ SO42-‚ HCO3-. When this water evaporates or boils‚ the difficult to dissolve metal salts remain as a scaly residue. Hard water inhibits the effectiveness of soap and detergents
Premium Calcium Water Hard water
Executive Summary In today’s competitive world an employee satisfaction is very important for companies as a satisfied employee would produce more which in turn would give better benefits to the company. Job satisfaction is closely related to motivation level of the employees which depends on many factors such as monetary and non monetary benefits‚ working environment‚ co-workers‚ nature of the job etc.‚ when all these factors are kept in proper levels the employee satisfaction level increases or
Premium Job satisfaction
Determination of the Solubility of Calcium Hydroxide Apparatus * Solid calcium hydroxide * 0.4 mol/dm hydrochloric acid * Distilled water * Pipette * Triple valve rubber pipette filler * Conical flask * Beaker * White tile * Clamp and stand * Methyl orange indicator Producing the calcium hydroxide solution 1. Roughly fill a beaker with 200cm³ of distilled water. This does not need to be accurate because samples will be taken from this. 2. Add solid calcium
Free Titration Laboratory glassware PH indicator
No one knows for sure‚ but telling people the latter – that hard work trumps genes – causes instant changes in the brain and may make them more willing to strive for success‚ indicates a new study from Michigan State University. The findings suggest the human brain is more receptive to the message that intelligence comes from the environment‚ regardless of whether it’s true. And this simple message‚ said lead investigator Hans Schroder‚ may ultimately prompt us to work harder. “Giving people messages
Premium Education High school Teacher
Demand‚ Supply and Market Price Determination Consumer behaviour Utility is the economist’s term for the satisfaction a customer derives from the goods that they buy. Marginal utility is the increase in total utility arising from an increase in consumption by one more. For example‚ suppose I like eating bananas‚ and I have already eaten one banana; then the satisfaction I get from consuming a second banana is called by economists the marginal utility. Marginal utility is the utility gain from
Premium Supply and demand
the high concentration of the ions‚ the silver chloride coagulated to a desirable size that could be filtered and washed with nitric acid through a previously weighed crucible. Once the sample was washed free of impurities‚ it could be dried to a constant mass which allowed for the mass of chloride to be determined using a calculation explained later. As it
Free Solubility Silver Ion
| Determination of the Critical Micelle Concentration | | | | Introduction: Purpose: The purpose of this experiment is to use the Conductometric method to determine the critical micelle concentration of SDS. Materials and Equipment: * SDS- Sigma Aldrich‚ Lot: 38H0080‚ S/N: L-439‚ * NaCl- Food grade Great Value * SDS 20% solution- Fisher Biotech‚ S/N: BP1311-200‚ Lot: 468059 * Wave generator- Pasco Scientific‚ S/N PI-9587C * Ammeter- Keithley Auto-ranging
Premium Concentration Chemistry Water
Censorship and the First Amendment: The American Citizen ’s Right to Free Speech Are we protected from censorship under the First Amendment? In other words do individuals or groups have the right or the power to examine material and remove or prohibit anything they consider objectionable? This argument has been progressing for centuries‚ in fact the first notable case was against John Peter Zenger‚ in 1743. Zenger was an editor of a New York colonial newspaper that often published articles
Free First Amendment to the United States Constitution Freedom of speech Censorship