Chem 110- Fall 2012 Review Questions –Chapters 15 1. What mass of NaOH is required to prepare 100.0 mL of NaOH(aq) that has a pH = 13.62? 2. What is the [OH-] in 0.025 M HCl ? 3. What is the pH of 0.50 M Sr(OH)2 ? 4. The pH of an aqueous solution is 10.32. The [OH-] is …………………… 5. The [H+] in 0.050 M Mg(OH)2 at 25oC is ………………………. 6. The pH of 0.20 M HNO3 is ……………………. 7. A solution is prepared by adding 200. mL of 0.125 M of HCl to a 500.0mL volumetric
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Chemistry Lab: Hydrolysis of Salts Name_____________________________________________________Date__________________ New Concept: Hydrolysis Reactions Review Concepts/Application: Writing chemical formulas‚ writing ionic equations‚ determining solubility‚ measuring acidity and basicity. Pre-Lab Discussion A salt is an ionic compound containing positive ions other than H+ and negative ions other than OH-. Most salts will dissociate to some degree when placed in water. In many
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SALTS EVERYDAY First some words about salts in chemistry. Salts are ionic compounds that can result from the neutralization reaction of an acid and a base. They are composed of related numbers of cations (positively charged ions) and anions (negative ions) so that the product is electrically neutral (without a net charge). Salts can appear to be clear and transparent (sodium chloride)‚ opaque‚ and even metallic and lustrous (iron disulfide). In many cases the apparent opacity or transparency are
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Identification of Metallic Ions Peter Jeschofnig‚ Ph.D. Version 42-0160-00-01 Lab RepoRt assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor. obseRvations
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Michael Pollan‚ The Omnivore’s Dilemma: The Secrets Behind What You Eat (Young Reader’s Edition) - Grade 7 Originally published in New York: Dial Books‚ 2009. Learning Objective: The goal of this two day exemplar is to give students the opportunity to use the reading and writing habits they’ve been practicing on a regular basis to unpack Pollan’s investigative journalism of industrial farms. By reading and rereading the passage closely combined with classroom discussion about it‚ students will
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Nitrocellulose Materials Christian Friedrich Schönbein’s procedure has been widely used. It calls for 1 part cotton to 15 parts acid. concentrated nitric acid concentrated sulfuric acid cotton balls (almost pure cellulose) Nitrocellulose Preparation Chill the acids below 0°C. In a fume hood‚ mix equal parts nitric and sulfuric acid in a beaker. Drop cotton balls into the acid. You can tamp them down using a glass stirring rod. Don’t use metal. Allow the nitration reaction to proceed for about 15
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Name SOLUBILITY CURVES Answer the following questions based on the solubility curve below. Which salt is least soluble in water .. at 2O° C? 2. How many grams of potassium chloride can be dissolved in 200 g of water at 80° C? IO 3. At 40° C‚ how much potassium _ __nitrate coin be dissoiu$tl ^n 30D.g of water? ------W- ’1 80 70 ...- O --60 0 5© 40 4. Which salt shows the least change 30 In solubility from 0° - 100° C? 20 10 At 30° C‚ 90 g of sodium
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1 - What are the coefficients for the reactants and the products when the equation for the reaction: Ca(OH)2 (aq) + HNO3 (aq) → Ca(NO3)2 (s) + H2O (ℓ) is balanced? 1‚ 4‚ 2‚ 4 1‚ 2‚ 1‚ 2 1‚ 1‚ 1‚ 2 None of the above 2 - The mass in grams of two moles of iron atoms is: 26.00 g 55.847 g 111.69 g 27.923 g 3 - The formula mass of nitric acid is given by: 31.50 g/mol 17.03 g/mol 63.01 g/mol 126.02 g/mol 4 - Sodium oxide has the formula: Na2O Na2O2 NaO2 Na4O2 5 - The
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An Introduction to Qualitative Analysis Purpose: Tests the ions of Mg2+‚ Ca2+‚ Sr2+‚ and Ba2+‚ and identify them separately. By using these observations‚ identify the unknown ion. Then tests the ions of SO42-‚ CO32-‚ Cl-‚ and I-‚identify them separately‚ and use the observation to identify the unknown. Procedure Part I - Qualitative Analysis of Group 2 Elements Mix 0.02M K2CrO4 with each Mg(NO3)2‚ Ca(NO3)2‚ Sr(NO3)2 and Ba(NO3)2 together. Secondly‚ mix 0.1M (NH4)2C2O4 instead
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Acid –Base Titration: A volume of 128 mL of 0.650 M Ba(OH)2 was required to completely neutralize 50.0 mL of nitric acid solution (HNO3). What is the concentration of the acid solution? Gravimetric Titration: Calculate the molar concentration of Ba2+ ions in a 500.0 mL sample of an unknown aqueous solution if 2.47 g BaSO4 is formed upon the addition of excess Na2SO4? Stoichiometry of Acid –Base Reactions: What volume of 0.800 M HCl is required to completely neutralize 35.0 g of Ca(OH)2
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