Worked solutions to student book questions Chapter 4 Analysing acids and bases Q1. Antacid tablets should normally be chewed before they are swallowed. Why? A1. Antacid tablets are normally chewed to provide a larger surface area for faster reaction with stomach acids. Q2. A laboratory test to determine how much hydrochloric acid is neutralised by a brand of antacid does not give a complete picture of its effectiveness in the stomach. What other factors might be important? A2. Other factors to
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acid. Equivalent weight is determined by the pairing the unknown’s acidic hydrogens (H+) with known quantities of hydroxyl ions (OH-) through the process of titration. Before beginning a titration of the unknown acid‚ several practice titrations of HCl (hydrochloric acid) with a known
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Investigation into How the Concentration of a Reactant Can Affect the Rate of Reaction Aim To plan an investigation that allows me to measure the effect of increasing the concentration of a reactant on the rate of reaction. With the results generated‚ it is also hoped to draw accurate conclusions and explain the results using scientific knowledge. Introduction Some reactions are fast‚ for example neutralisation or burning magnesium in air to produce magnesium oxide. However‚ other reactions
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INTRODUCTION: Carboxylic acids are organic acids characterized by the presence of a carboxyl group‚ -COOH. This acid acts as a weak acid‚ which can react with a strong base. Carboxylic acids form hydrogen bonds with many water molecules and are more soluble with one to four carbon atoms. Also‚ it may have an R group that consist of hydrogen or an alkyl group that changes its water solubility. Carboxylic acids with low molecular weight have odor at room temperature and higher molecular weight
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Lab Report: Titration Lab Prepare a solution of a given concentration; understand titration including acid-base reactions‚ pH‚ stoichiometry and molar equivalence. Chemicals and equipment: NaOH pellets close to purity‚ HCl 3M‚ phenolphtalein Beckers‚ flasks‚ burette‚ magnetic or manual stir pHmeter Waste management: The waste disposal will be handled through neutralization of your excess reactant to a pH between 4.0 and 10.0 and disposal with abundant rinsing. As a preparation for the
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zinc with HCl. Zn (s) + 2 HCl(aq) ====> Zn+2(aq) + 2 Cl-(aq) + H2(g) Reaction: Zn(s) + 2 H+(aq) ====> Zn+2(aq) + H2(g) 6. How many moles of HCl are needed to react completely with all of the zinc in a post 1982 penny? 7.46 x 10-2 mol HCl 7. In a procedure developed to determine the percent zinc in post 1982 pennies‚ 50 ml of an HCl solution was used to react (dissolve) all of the zinc in the penny. To ensure complete reaction‚ the solution contains twice as many moles of HCl that is
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Introduction: A balanced chemical equation has reactants and product that has to represent a formulae. The amount of each element‚ number needs to be the same in either side of the equation. (E.g.‚ HCl(aq)+NaHCO3(s) reacts to produce NaCl(aq)+H2O(I)+CO2(g)‚ this is the equation given for this lab). This help us view the study of Law of Conservation of Mass‚ when either side of equation is equally balanced. The calculation for formula mass helps determine if you need to convert grams to a particular
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A burette and funnel were rinsed off using water and cleaned well. The burette and funnel were rinsed a second time using 5mL of the HCl solution that was prepared the previous week and disposed of in a clean beaker. The rest of the HCl solution was then put in the burette. The beaker containing the baking soda solution was placed under the burette. 1mL of the HCl solution was released at a time into the beaker with the baking soda until a change was observed. The results were recorded. The process
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Thermochemistry Lab Purpose: This lab taught procedures for determining heat of capacity of a calorimeter and measuring enthalpy of change for three reactions. It also enforced methods of analyzing data obtained through experimentation and calculating enthalpy. These procedures are used in the branch of thermodynamics known as thermochemistry which is the study of energy changes that accompany chemical reactions. Concepts from this lab can be used to determine the potential energy of a chemical
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CASE APPLICATION Understanding HCLites: Part 2 HCL Technologies is headquartered in the world’s largest democracy‚ so it’s quite fitting that the New Delhi-based company is attempting a radical experiment in workplace democracy. CEO Vineet Nayar is committed to creating a company where the job of company leaders is to enable people to find their own destiny by gravitating to their strengths. As we discussed in the chapter opener‚ one thing that Nayar has done is to pioneer a culture in which
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