Figure 1: Titration curve of 0.160 grams of an unknown diprotic acid that was dissociated in distilled water. Shown is the pH versus the volume in milliliters of 0.1 M NaOH‚ a strong base‚ added to the solution. The initial pH reading of the solution was a pH of 2.60. Although the pH of the ½ equivalence point was unknown‚ it could be estimated by halving the volume of NaOH used at the first equivalence point. At the first equivalence point‚ 13.63 milliliters of NaOH had been added to the unknown
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Question # 1: You are titrating 50 ml. of nitrous acid with sodium hydroxide (0.15 M). Equivalence is reached at 22.0 ml of NaOH delivered. Calculate the pH of the solution in the flask: a- before the beginning of the titration - after the delivery of 5 ml. of titrant b- at half-equivalence c-at equivalence d-after delivery of 23 ml. of titrant Part A) Reaction is: HNO2 + OH- NO2- + H2O Ka for Nitrous acid = 7.2E-4 Kw = Ka*Lb Kb = 1.0E-14/7.2E-4 Kb = 1.38E-11 Moles of base:
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Introduction To Scanning Electron Microscopy At the completion of the prac‚ the practical experience of operating a scanning electron microscope is sufficient to operate the particular machine in the future. During the experiment‚ two different gold plated samples are analysed under the SEM and compositional and topographic information is identified and analysed. Both the information is derived by changing the working distance‚ accelerating voltage‚ aperture size‚ probe current‚ resolution and
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MA‚ PAULINE Date Performed: 10 SEPTEMBER 2014 NACIONGAYO‚ DANIELLE Date Submitted: 17 SEPTEMBER 2014 TEDERA‚ YVES HEAT EFFECTS AND CALORIMETRY Experiment No. 2 I. RESULTS A. Determination of Heat Capacity In this experiment‚ an improvised calorimeter was used to determine the heat capacity. The calorimeter weighed 4.47 grams prior to the addition of water. Tap water‚ 40 mL to be exact‚ was added to the calorimeter which increased the weight to 43.87 grams. The water was measured using
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Mackenzie Skelton October 22nd‚ 2014 Journalism 350 Environmental Scanning Report Every year a new update for the iPhone is released and following that is the release of the actual new and improved phone‚ in this case the iPhone 6 and 6 plus. On September 24th‚ 2014‚ Apple launched the iOS 8.0.1. update‚ available to all phones‚ new and old. This update did the opposite of what it was intended to do by disabling cellphone service on an untold number of iPhones among some other small issues.
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1. Differential Association theory would explain the burglar’s behavior by first looking at their social structure. Their social structure can affect everything; it can influence their close relationships‚ open them up to objective opportunities and could be seen as the main attribute that affects their learning process in behavior. A. Most of the people in these interviews are poor‚ young males with similar social structures. Growing up on the streets and in bad neighborhoods can influence the
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Chapter 4 Internal Scanning: Organizational Analysis Resource-Based Approach Internal strategic factors: Critical strengths and weaknesses that are likely to determine if the firm will be able to take advantage of opportunities while avoiding threats. Resource-Based Approach Resource: An asset‚ competency‚ process‚ skill‚ or knowledge controlled by the corporation. 1 Evaluating “Key Resources” VRIO Framework • Value: Does it provide competitive advantage? Rareness: Do other competitors
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I. Objective: The objective of this experiment is to determine the mass percent of iron in an iron compound using a spectrophotometer. From there‚ determine which iron compounds are in the stock room bottles based off of the experimental mass percent results. II. Introduction: The objective is to determine the mass percent of iron in an iron compound using a spectrophotometer. From there‚ determine which iron compounds are in the stock room bottles based off of the experimental mass percent results
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First‚ prepare a data table. Record what you see throughout the laboratory activity. Your teacher will demonstrate for the class the reaction of metallic copper with concentrated nitric acid‚ HNO3. This must be done in the fume hood. (Caution: Avoid breathing poisonous gases. Avoid contact of skin with nitric acid. It burns skin and clothing.) One student will be asked to feel the side of the demonstration beaker and report to the group. The products formed are copper(II) nitrate solution‚ Cu(NO3)2(aq)
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MODULE 2 WORKSHEET 6 CALCULATIONS INVOLVING GASES Syllabus reference 9.3.2 1 Two identical gas flasks‚ A and B‚ are kept at the same temperature and pressure. Flask A contains 10 g of ethane gas‚ C2H6. Flask B contains sulfur dioxide gas‚ SO2. Calculate the mass of sulfur dioxide gas in flask B. moles ethane 10/30 0.33 mol moles SO2 0.33 mol mass SO2 0.33 64 21 g 2 What mass of nitric oxide‚ NO‚ is present in a 2.5 L flask at a pressure of 100 kPa and 0ºC? mole NO 2.5/22.71
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