Scientific Paper on Diffusion 2 ABSTRACT The effect of molecular weight on the rate of diffusion was assessed using two tests: the glass tube test and the agar-water gel test. In the glass tube set-up‚ two cotton plugs soaked in two different substances (HCl and NH4OH) were inserted into the two ends of the glass tube. The substance with the lighter molecular weight value (NH4OH‚ M = 35.0459 g/mole) diffused at a faster rate (dAve = 25.8cm)‚ resulting in the formation of a white ring around the
Premium Molecular diffusion Hydrochloric acid Ammonia
experiment‚ we will standardize acid and base solutions. In this experiment‚ the students to students will be able to know the proper way of preparing solutions from solid and liquid reagents by using the proper pieces of glassware and equipment and to calculate the exact concentration of the prepared solution from standardization. PROCEDURE The reagents that were used in this experiment were concentrated hydrochloric acid‚ sodium hyrdoxide‚ sodium carbonate‚ potassium acid phthalate and phenolphthalein
Premium Sodium hydroxide Titration Hydrochloric acid
I had no idea of what was going on. I went to my local clinic to make sure that nothing was seriously wrong. After‚ some tests a week or so later they found Hydrochloric acid‚ and formaldehyde residue. The doctors told me my lungs‚ eyes‚ and skin burnt because they were irritated. After‚ a few questions I found out that: Hydrochloric acid is corrosive to the eyes‚ skin‚ and mucous membranes. Short term exposure fitted my symptoms. They included: eye‚ nose‚ and repertory tract irritation. Also‚
Premium Hydrochloric acid Pollution Chlorine
CHAPTER 1 Introduction Background of the Study Like many other hygiene convenience‚ shoe polish or can also be called boot polish is usually a wax ‚ cream or paste used by people to shine‚ water proof and restore the appearance of leather shoes. This extends the footwear’s life. This is made up of many kinds of chemicals and because of this; it can cause irritations‚ allergies to us. In our generation‚ shoe polish is used every day and companies produce a lot of it to meet the demands of
Premium Acid Footwear Citric acid cycle
level and any changes in pH can result in them not functioning properly. To maintain these constant pH levels‚ buffer solutions are used. A buffer solution can resist change to small additions of acids or base’s. A good buffer will have components that act like a base‚ and components that act like an acid. Diffusion is random movement of molecules or other particles‚ resulting in even distribution of particles when no barriers are present (David Sadava‚ 2011). Diffusion always occurs from areas
Premium PH Buffer solution Hydrochloric acid
absorbed absorbed Physical and chemical ProPerties Did you observer any chemical changes in this experiment? Yes What evidence did you use to decide that something was a chemical change? I observed during the application of the hydrochloric acid to some of the substances bubbling‚ and smoking Give at least two examples of chemical changes you observed. green changed form blue to application of HCL to Mg smoking and bubbling and CuCO3 Classify the following properties of
Premium Sodium Sodium chloride Chlorine
Chemistry IGCSE Paper 6 revision guide You can change the temperature and concentration used (not both at the same time though) You need to keep the diameter of the conical flask the same‚ if it is thinner then the cross will disappear sooner‚ the cross also has to be the same‚ volumes too (This set up is mostly if you want to test the gases‚ otherwise you can use the standard set up) The limestone cycle: 1. Burn the limestone
Premium Sodium hydroxide Chlorine Carbon dioxide
PHYSICAL PROPERTIES OF THE PERIOD 3 OXIDES These pages explain the relationship between the physical properties of the oxides of Period 3 elements (sodium to chlorine) and their structures. Argon is obviously omitted because it doesn’t form an oxide. A quick summary of the trends The oxides The oxides we’ll be looking at are: |Na2O |MgO |Al2O3 |SiO2 |P4O10 |SO3 |Cl2O7 | | | | | |P4O6 |SO2 |Cl2O
Premium Ion Oxide Sodium chloride
known starting mass of magnesium and the measured collection of hydrogen gas will be used to determine the reaction stoichiometry. This experiment determines the stoichiometry of a reaction of magnesium and hydrochloric acid. Magnesium reacts with magnesium is react with hydrochloric acid to form hydrogen gas. The aim of this experiment is to determine the value of x in the following equation: Mg + X HCl → MgCl2 + X/2 H2 A known amount of magnesium is reacted with a large excess of HCl‚ and
Free Chemical reaction Hydrogen Chlorine
when it is left in a sunny place. [1] © UCLES 2011 1113/01/SP/12 [Turn over 4 3 Maya investigates the reaction between calcium carbonate and hydrochloric acid. She adds dilute hydrochloric acid to some calcium carbonate (marble chips)‚ at room temperature. She collects the gas given off in a gas syringe. For Examiner’s Use dilute hydrochloric acid syringe calcium carbonate (a) Suggest one safety hazard in this experiment. How can Maya reduce the risk from this hazard? hazard how to
Premium Sedimentary rock Water University of Cambridge