Chemistry: The Molecular Nature of Matter
Chemistry: The Molecular Nature of Matter
7th Edition
ISBN: 9781118516461
Author: Neil D. Jespersen, Alison Hyslop
Publisher: WILEY
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Chapter 5, Problem 127RQ

A solution containing 0.1244 g of K 2 C 2 O4 was acidified, changing the C 2 O 4 2- ions to H 2 C 2 O 4 . The solution was then titrated with 13.93 mL of a KMnO 4 solution to reach a faint pink end point. In the reaction, H 2 C 2 O4 was oxidized to CO 2 and MnO 4 - was reduced to Mn 2+ . What was the molarity of the KMnO 4 solution used in the titration?

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1. A sample containing magnetite, Fe;O4, was analyzed by dissolving a 1.5419-g sample in concentrated HCI, giving a mixture of Fe2+ and Fe³+. After adding HNO3 to oxidize any Fe2+ to Fet, the resulting solution was diluted with water and the Fe+ precipitated as Fe(OH)3 by adding NH3. After filtering and rinsing, the residue was ignited, resulting to 0.8525 g of pure Fe2O3. Calculate the: a) % (w/w) Fe b) % (w/w) Fe;O4 in the sample.
Twenty tablets of an iron food supplement whose total mass was 22.131 g were crushed and perfectly mixed. Then 2.998g of the powder was dissolved in HNO3 and the solution was heated to convert all the iron to Fe+3. By addition of NH3 it was quantitatively precipitated as Fe(OH)3•H20 which was calcined to form 0.264g of Fe203. Calculate the Fe content in each tablet.
To determine the amount of magnetite, Fe3O4 in an impure ore, a 1.5419 g sample is dissolved in concentrated HCl to obtain a mixture of Fe2 + and Fe3 +. After HNO3 is added to oxidize Fe2 + to Fe3 + and diluted with water, Fe3 + is precipitated as Fe (OH) 3 by adding NH3. 0.8525 g of pure Fe2O3 is obtained by filtering, rinsing and burning the precipitate. Calculate the percentage of Fe3O4% in the sample. (Fe = 55,847g / mol, O = 15,999g / mol)

Chapter 5 Solutions

Chemistry: The Molecular Nature of Matter

Ch. 5 - Write the balanced half-react ions for the...Ch. 5 - Prob. 12PECh. 5 - Suppose an aqueous mixture is prepared containing...Ch. 5 - Prob. 14PECh. 5 - Prob. 15PECh. 5 - Write a balanced equation for the combustion of...Ch. 5 - Prob. 17PECh. 5 - Prob. 18PECh. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Prob. 3RQCh. 5 - Are the following redox reactions? Explain....Ch. 5 - If the oxidation number of nitrogen in a certain...Ch. 5 - When balancing redox reactions, which side of a...Ch. 5 - Prob. 7RQCh. 5 - What are the net charges on the left and right...Ch. 5 - In Question 5.8, which half-reaction represents...Ch. 5 - The following equation is not balanced....Ch. 5 - 5.11 What is a nonoxidizing acid? Give two...Ch. 5 - What is the strongest oxidizing agent in an...Ch. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - What is a single replacement reaction?Ch. 5 - If a metal is able to react with a solution of...Ch. 5 - Prob. 17RQCh. 5 - Prob. 18RQCh. 5 - Where in the activity series do we find the best...Ch. 5 - When manganese reacts with silver ions, is...Ch. 5 - Prob. 21RQCh. 5 - Prob. 22RQCh. 5 - Prob. 23RQCh. 5 - If one of the impurities in diesel fuel has the...Ch. 5 - Prob. 25RQCh. 5 - Prob. 26RQCh. 5 - Prob. 27RQCh. 5 - Potassium permanganate is often used for redox...Ch. 5 - Assign oxidation numbers to the atoms in the...Ch. 5 - 5.30 Assign oxidation numbers to the atoms in the...Ch. 5 - Assign oxidation numbers to each atom in the...Ch. 5 - Assign oxidation numbers to the elements...Ch. 5 - 5.33 Assign oxidation numbers to the elements in...Ch. 5 - 5.34 Assign oxidation numbers to the elements in...Ch. 5 - Titanium burns in pure nitrogen to form TiN. What...Ch. 5 - 5.36 Zirconia, which is , is used to make ceramic...Ch. 5 - 5.37 Ozone, , is an allotrope of oxygen and is one...Ch. 5 - 5.38 The other major air pollutant is . What are...Ch. 5 - For the following reactions, identify the...Ch. 5 - 5.40 For the following reactions, identify the...Ch. 5 - When chlorine is added to drinking water to kill...Ch. 5 - One pollutant in smog is nitrogen dioxide. NO2....Ch. 5 - Balance the following equations for reactions...Ch. 5 - 5.44 Balance the following equations for reactions...Ch. 5 - Prob. 45RQCh. 5 - 5.46 Balance the following equations for reactions...Ch. 5 - 5.47 Balance the equations for the following...Ch. 5 - Balance the equations for the following reactions...Ch. 5 - Prob. 49RQCh. 5 - 5.50 Hydroiodic acid reduces chlorine to...Ch. 5 - Prob. 51RQCh. 5 - Corn is grown for human consumption, feeding...Ch. 5 - Prob. 53RQCh. 5 - Laundry bleach such as Clorox is a dilute solution...Ch. 5 - Prob. 55RQCh. 5 - Chlorine is a good bleaching agent because it is...Ch. 5 - Write balanced molecular, ionic, and net ionic...Ch. 5 - 5.58 Write balanced molecular, ionic, and net...Ch. 5 - Prob. 59RQCh. 5 - Prob. 60RQCh. 5 - Prob. 61RQCh. 5 - Prob. 62RQCh. 5 - Prob. 63RQCh. 5 - Hot, concentrated sulfuric acid is a fairly strong...Ch. 5 - Use Table 5.3 to predict the outcome of the...Ch. 5 - 5.66 Use Table 5.3 to predict the outcome of the...Ch. 5 - The following reactions occur spontaneously....Ch. 5 - The following reactions occur spontaneously....Ch. 5 - Prob. 69RQCh. 5 - When chromium metal is dipped into a solution of...Ch. 5 - Write a balanced equation for the reaction...Ch. 5 - Write a balanced equation for the reaction...Ch. 5 - Write the balanced chemical equation for the...Ch. 5 - Write the balanced chemical equation for the...Ch. 5 - 5.75 Write balanced chemical equations for the...Ch. 5 - Write balanced chemical equations for the complete...Ch. 5 - 5.77 Write balanced equations for the combustion...Ch. 5 - 5.78 Write balanced equations for the combustion...Ch. 5 - 5.79 The metabolism of carbohydrates such as...Ch. 5 - Methanol, CH3OH, has been suggested as an...Ch. 5 - Write the balanced equation for the combustion of...Ch. 5 - 5.82 Thiophene, , is an impurity in crude oil and...Ch. 5 - Write chemical equations for the reaction of...Ch. 5 - Prob. 84RQCh. 5 - Prob. 85RQCh. 5 - Prob. 86RQCh. 5 - In an acidic solution, permanganate ion reacts...Ch. 5 - 5.88 In an acidic solution, bisulfite ion reacts...Ch. 5 - Prob. 89RQCh. 5 - Potable water (drinking water) should not have...Ch. 5 - 5.91 Sulfites are used worldwide in the wine...Ch. 5 - Methylbromide, CH3Br, is used in agriculture to...Ch. 5 - A sample of a copper ore with a mass of 0.4225 g...Ch. 5 - 5.94 A 1.362 g sample of an iron ore that...Ch. 5 - 5.95 Hydrogen peroxide, , solution can be...Ch. 5 - 5.96 Sodium nitrite, , is used as a preservative...Ch. 5 - Prob. 97RQCh. 5 - Prob. 98RQCh. 5 - Both calcium chloride and sodium chloride are used...Ch. 5 - 5.100 One way to analyze a sample for nitrite ion...Ch. 5 - Use oxidation numbers to show that the...Ch. 5 - Prob. 102RQCh. 5 - Prob. 103RQCh. 5 - Prob. 104RQCh. 5 - Balance the following equations using the...Ch. 5 - Prob. 106RQCh. 5 - What is the average oxidation number of carbon in...Ch. 5 - Prob. 108RQCh. 5 - In Problem 5-108, were all of the experiments...Ch. 5 - Prob. 110RQCh. 5 - 5.111 In each of the following pairs, choose the...Ch. 5 - Use Table 5.3 to predict whether the following...Ch. 5 - Sucrose, C12H22O11, is ordinary table sugar. Write...Ch. 5 - Balance the following equations by the...Ch. 5 - 5.115 Lead(IV) oxide reacts with hydrochloric acid...Ch. 5 - Prob. 116RQCh. 5 - A copper bar with a mass of 12.340 g is dipped...Ch. 5 - Prob. 118RQCh. 5 - 5.119 As described in the Chemistry Outside the...Ch. 5 - Titanium(IV) can be reduced to titanium(III) by...Ch. 5 - A researcher planned to use chlorine gas in an...Ch. 5 - 5.122 A sample of a tin ore weighing 0.3000 g was...Ch. 5 - Biodiesel is formed from the reaction of oils with...Ch. 5 - *5.124 In June 2002, the Department of Health and...Ch. 5 - An organic compound contains carbon, hydrogen, and...Ch. 5 - *5.126 A mixture is made by combining with ....Ch. 5 - A solution containing 0.1244 g of K2C2O4 was...Ch. 5 - It was found that a 20.0 mL portion of a solution...Ch. 5 - A 15.00 mL sample of a solution containing oxalic...Ch. 5 - A solution with a volume of 500.0 mL contained a...Ch. 5 - Prob. 131RQCh. 5 - We described the ion-electron method for balancing...Ch. 5 - Assuming that a chemical reaction with DNA could...Ch. 5 - Would you expect atomic oxygen and chlorine to be...Ch. 5 - Prob. 135RQCh. 5 - Prob. 136RQ
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