of thiosulphate. Using the titre values Tt (ml)‚ time (s) and Tinf‚ graphs were plotted in order to obtain the rate constants k’‚ k’’ and hence ‘n’‚ the reaction order. For part 1‚ a value of 0.96 was obtained for the slope of the graph‚ which is approximately equal to 1‚ indicating that this is a first order reaction. A value of 0.001 was then obtained for k’‚ the rate constant. For part 2‚ the slope was found to be 0.91 which is again approximately equal to 1. A value of 0.0005 was obtained
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resists (or buffers) a change in its pH. That is‚ we can add a small amount of an acid or base to a buffer solution and the pH will change very little. How to calculate pH of buffer solution containing both acid and conjugate base? Dissociation constant definition 1.1 can be rearranged into or (note that due to sign change [A-] was moved to nominator). This is so called Henderson-Hasselbalch equation (or buffer equation). It can be used for pH calculation of solution containing
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CHAPTER 3 THEORETICAL FRAMEWORK The theoretical framework of the thesis is multidisciplinary in approach. First‚ tourism impacts and tourism in the Gross Domestic Product are pooled into the framework to better understand the impact of tourism in the whole economy. Finally‚ general equilibrium theories and the theoretical structure of an applied CGE model are briefly discussed to better understand the framework under which the tourism sub-sector interacts with the other sectors‚ sub-sectors
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neutralizing the acid. The volume of base added can be determined by the difference in the initial and final volume marks on the buret. At a certain volume of added NaOH‚ all the KHP acid will be neutralized due to the large equilibrium dissociation constant (Kb) of the base. This point of titration is referred to as the equivalence point. Considering the 1:1 stoichiometry of this acid-base reaction NaOH(aq) + C6H4(COOH)(COOK) (aq) C6H4(COONa)(COOK)(aq) + H2O(l) the point of equivalence is the point
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Separation of a Carboxylic Acid from a Neutral Compound by Extraction Reference: Smith‚ Chapter 2 (Acids and Bases) Introduction Carboxylic acids and phenols are two families of organic compounds that contain carbon‚ hydrogen and oxygen‚ and also react with water to yield an excess of hydronium ions over hydroxide ions. Pure water has a pH of 7‚ which means it has a hydronium ion concentration‚ [H3O+] of 10-7 M (M = molarity‚ moles/Liter). The hydronium ions in pure water come from the self-ionization
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In the poem “Frankenstein” by by Edward Field and the article “Tanzania’s Albino’s Face Constant Threat of Attack” by John Burnet‚ the main idea is they are both treated with violence. In the poem “Frankenstein”‚ Frankenstein is tortured by a Baron and the people in the Village. In the article‚ the Albino’s have their limbs sometimes chopped off because some witch doctors think they are magical. These two passages are paired together because they both have something to do with mistreatment. There
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Determination of Gas Constant R through Mg and HCl Reaction ! ! ! ! ! !1 of !9 IB Chemistry SL (Jr) Candidate: Yunha Kim Objective ! Candidates will react Magnesium with Hydrochloric acid and collect Hydrogen. The grams of the produced Hydrogen will be calculated and compared to the theoretical yield of Hydrogen. ! Controlled Variables ! Mass of Magnesium Ribbon This will be kept constant as the objective is to determine the Gas Constant (R). If this is influenced
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AP Chemistry Chapter 17 Additional Aspects of Aqueous Equilibria Chapter 17. Additional Aspects of Equilibrium Common Student Misconceptions • • • • • Students often believe that the pH at the equivalence point for any titration is 7.00. In terms of problem-solving skills‚ this is probably the most difficult chapter for most students. Students tend to find buffers particularly difficult to understand. Students often forget to consider volume changes that occur when two solutions
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Political activist‚ radical‚ intellectual‚ communist‚ feminist‚ rebel‚ scholar‚ revolutionary‚ but the story of her life can be defined as justice seeker. Angela Davis has notably become known as a novelist‚ in her narrative essay‚ “Freedom Is A Constant Struggle” that acknowledges discriminatory acts towards African Americans in particular. Davis motivation is to show the historical unequal treatment of African Americans in North America. She embraces a tone that is reflective of the unfair treatment
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fraction is high and therefore‚ collisions produce a reaction. In 1889‚ Svante Arrhenius demonstrated that the rate constant k is related to the temperature of the system by what is known as the Arrhenius equation: k=A where R is the ideal gas constant [8.314 J/(mol oK)]‚ T is the temperature in degrees Kelvin‚ Ea is the activation energy in joules per mol‚ and A is a constant called the frequency factor‚ which is related to the fraction of collisions between reactants having the
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