Sunny Ng Wing Lam G10L (20) Chemistry A Lab 10.2 Determining the Concentration of Ammonia in Window Cleaner Solution Design (D) Aim To determine the concentration of ammonia‚ NH3‚ in the commercial window cleaner solution Background Window cleaner contains ammonia‚ NH3‚ a weak base‚ which helps remove dirt from glassware. The concentration of ammonia in the window cleaner solution varies by brands. Titrating the window cleaner solution with an acid of known concentration allows us
Free Titration Laboratory glassware
Synopsis: The main aim of the experiment is to find out the amount of calcium carbonate in toothpaste through back titration since calcium carbonate does not dissolve in water. A roughly weighed amount of calcium carbonate is mixed with hydrochloric acid and then titrated against sodium hydroxide. When the indicator turns from pink to orange‚ the volume of sodium hydroxide used is taken down. After doing some calculations‚ the average percentage of calcium carbonate in toothpaste is 19.2%. This average
Premium Sodium hydroxide Calcium carbonate Carbon dioxide
Topic 2 METALS What is this topic about? To keep it as simple as possible‚ (K.I.S.S.) this topic involves the study of: 1. OUR USE of METALS 2. CHEMICAL ACTIVITY of the METALS 3. PATTERNS of the PERIODIC TABLE 4. QUANTITY CALCULATIONS... the MOLE 5. METALS from their ORES ...all in the context of how Chemistry contributes to cultural development but first‚ an introduction... Chemistry of the Metals Technology Needs Metals In the previous topic you learnt about the Elements of the
Free Periodic table Chemical element Atom
the product this reaction produce dependent on the limiting reactant. For example‚ 1000kg O2 and 1 gram H2 to form water. In this case‚ the 1 gram of H2 will be the limiting reactant. Same thing in displacement reactant. If one of the reactants is (Mole) less than the other one‚ then that reactants becomes the limiting reactants. Once the limiting reactants will completely be ran out of‚ the reaction is done. So the limiting reactant is the key to start and finish the chemical reaction. B. Procedures
Premium Stoichiometry Copper Reagent
is negligible) (915.141 g) 4. A mixture of noble gases contains 4.46 moles of Neon and 0.74 moles of Krypton and y mole of Xenon at a pressure of 2 atm. (a) Determine y mole of Xenon if the partial pressure of Neon is 1.214 atm. (2.148 moles) (b) Determine the partial pressure of Krypton. [Sep 2014] (0.2 atm) 5. Calculate the number of moles of sulfur dioxide gas‚ SO2‚ transported in a 2 L container at s.t.p. (0.089 mole) 6. Water has a vapour pressure of 24 mm Hg at 25 °C and 182 mm Hg at
Premium Oxygen Pressure Gas
The aim of this experiment was to calculate the concentration of an unknown solution of Sodium Hydroxide (NaOH) by titrating it with Hydrochloric Acid (HCl) and to identify any possible sources of error. A colour change from pink to yellow signified the end of each individual titre as the NaOH had been neutralised. Experimental: Method: Firstly two solutions were prepared to show the colour of the Phenol Red indicator in acid and alkaline conditions. These colours were then used to determine the
Premium Sodium hydroxide Chemistry Base
(AlK(SO4)2 ∙ 12H2O). These tests like the process of filtration heating the solution will reveal things such as melting point‚ percent hydrate‚ as well as percent sulfate. After the experiment‚ the experimental mole ratio of alum to water will be calculated and then compared with the accepted mole ratio. (This is 12 to 1). Theory If this lab if conducted properly‚ the unknown substance will be determined to be alum because of melting point‚ percent hydration and percent sulfate. The first test that
Premium Water
the solution is raised. Thus‚ a 0.1 M acetic acid solution has a pH of 2.87 but a solution of 0.1 M acetic acid and 0.1 M sodium acetate has a pH of 4.74. Thus 4.74 is the pH of the buffer. On addition of 0.01 mole NaOH the pH changes from 4.74 to 4.83‚ while on the addition of 0.01 mole HCl the pH changes from 4.74 to 4.66. Obviously the buffer solution maintains fairly constant pH and the changes in pH could be described as marginal. Buffer Action: A buffer solution containing equimolar
Free PH Acid dissociation constant Buffer solution
the hydrogen gas produced was calculated using Dalton’s Law of partial pressure. With this partial pressure value along with known values in the experiment the number of moles of hydrogen gas produced could be calculated using the ideal gas law equation and this experimental value was compared to the theoretical number of moles that should have been produced in the reaction. It was found that the average comparison value between the theoretical value and the experimental value was 97.8% with a standard
Free Pressure Ideal gas law Chlorine
The number of people diagnosed with cancer is increasing from year to year. When it comes to women‚ their biggest threat is breast cancer. According to the American Cancer Society at the end of 2016 there will be 246‚660 new cases of breast cancer among American women‚ and that around 40‚450 of those women will probably die from breast cancer. What the experts from the American Cancer Society also stated is that one in eight women in the U.S. are going to develop invasive breast cancer during their
Premium Cancer Breast cancer Metastasis