Since the k values will not change with concentration as long as temperature and the solvent remain constant, k should change as temperature changes1. This is seen in this experiment because the resulting k values of the heated and cooled sections were different from the general reaction. This SN1 reaction is only effected by the change in concentration of the substrate, t-butyl chloride, and not the nucleophile. Some parts of this experiment are extremely vulnerable to error. For example, when initially preparing the initial solutions for the 25 mL and 50 mL Erlenmeyer flasks, it would be very simple to unknowingly add too much of a chemical.
This mass is then to be added to the test tube, and the bung replaced. As is shown by the reaction for the experiment, a gas (Hydrogen) is released. This hydrogen displaces the water in the cylinder, and can be measured. The equation also shows that there is a relationship between the mass of lithium added to the test tube and the total volume of gas that is released by the reaction. The number of moles of lithium present in the mass used must be half that of hydrogen in the gas collected in the measuring cylinder.
To determine the relative formula mass of succinic acid I am going to do a titration against sodium hydroxide. The equation for the reaction is given below. To make the equation easier to read, HOOC(CH2)nCOOH will be condensed to H2A because of the two hydrogen atoms at either end. H2A+2NaOH à Na2A+2H2O (CV) H2A = 1 (CV) NaOH 2 I am going to use the NaOH as 0.1M because I don’t want it too concentrated, so therefore I am going to use H2A as 0.05M because of the ratio 2:1. In the formula of succinic acid below n is a whole number between 1 and 4.
The decision for selecting this solvent came from past experimentations as well. At first, methanol would have been a good solvent for fluorene, but methanol evaporates very quickly. A greater amount of methanol would have been required to dissolve the impure fluorene, but a little amount of ethanol is only needed to dissolve the impure fluorene completely. Once the ethanol solvent was boiling, a small amount was added to the flask, just enough to cover the impure fluorene solids. That flask was then heated on a hot plate, and additional hot ethanol was added continuously until the fluorene completely dissolved (10).
The Rennie antacids are also more cost effective as it costs less per tablet, they are more effective at neutralizing acid and therefore require a smaller dosage and also have no side effects unlike the Mylanta antacids which can cause diarrhoea. Introduction Background Information There are several antacids on the market and many claim to be fast working and provide long lasting relief. An antacid is a substance that has a basic content that reduces the pH of gastric juice in the stomach. pH is a measure of the hydrogen ions in one litre of a solution which indicates the acidity (and basicity) of a solution. The scale used to measure the pH ranges from 0 – 14, 0 being very acidic 7 being neutral and 14 being very basic.
Finding out How Much Acid There is in a Solution During the extraction of a metal from its ore, sulphur dioxide is often produced. It is converted into Sulphuric (VI) acid and sold as a useful by-product. I shall be carrying out a titration between sodium carbonate, a weak alkali, and sulphuric acid, a strong acid, to calculate the concentration of the sulphuric acid. The sodium carbonate sample I shall be using is a solid. Solids cannot be titrated successfully, so I will turn it into a solution by adding distilled water to it.
Deionized water was used to rinse the conical flask so that all the solution was transferred. 6. 0.1003 M of HCl was diluted tenfold to 0.01003 M. 25cm3 of HCl was pipetted to another 250.0cm3 volumetric flask, then deionized water was added to the volumetric flask until the graduation mark. 7. After the dilution in... ... middle of paper ... ...ch as random parallax error and the ambiguity in distinguishing between pale pink and colourless.
Catalyst can also help to dissociate the reduction product back to lithium metal and oxygen. Not only assisting the discharge reaction, but also increasing the capacity of the battery. Adding catalysts degrades the electrolyte solution which decreases the charge/discharge performance and also decreases the life of lithium – air batteries. Diffusion and solubility Diffusion and solubility is the most important mechanism in reaction kinetics of the battery. First, porous cathode must have good oxygen path for oxygen to pass through to electrolyte.
In the demo experiment, we placed 10 grams of Ammonium dichromate in the form of a solid before starting the experiment. When the experiment begins the Ammonium dichromate is burned up and then produces Chromium (III) oxide as a solid, Nitrogen gas and water in form of a gas. In the experiment, we combined Zinc Chloride and Sodium Sulfide in which both chemicals are aqueous. The result of the combination was Zinc Sulfide a solid and Sodium Chloride an aqueous solution. In the alternate experiment, we combined Lead (II) Nitrate and Potassium Iodide in which both chemicals are aqueous.
Investigation to Determine the Relative Atomic Mass of Lithium Introduction My aim of this experiment will be to determine the R.A.M using two separate methods In the first method I will dissolve a piece of lithium of a known mass in water, I will then collect the hydrogen gas produced, which can be used to calculate the relative atomic mass of Lithium. The balanced equation of our reaction is shown below; [IMAGE]2Li + 2H2O 2LiOH + H2 In the second method I will do a titration experiment of lithium hydroxide(produced in experiment 1) The balanced equation of our reaction in experiment 2 is shown below; [IMAGE]LiOH + HCl LiCl + H20 Background Information Lithium is an alkali metal in group 1 of the periodic table. It is a metallic element and does not decompose however it is highly in contact with many other substances. It can react violently with water, the humidity in air, and the moisture in other substances releasing hydrogen gas. [IMAGE] Apparatus * Lithium (0.1g) * Pan Balance * Conical Flask * Bowl * Measuring Cylinder (250cm3) * Delivery tube and Bung * Goggles * Filter * Clamp Method I set up the apparatus as shown above.