CHEMISTRY+CHEM...(LL)-W/ACCESS >CUSTOM<
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ISBN: 9780357096949
Author: Kotz
Publisher: CENGAGE C
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Chapter 4.9, Problem 2.1ACP
Excess KI is added to a 100.0-mL sample of a soft drink that had been contaminated with bleach, NaClO. The iodine (l2) generated in the solution is then titrated with 0.0425 M Na2S2O3 and requires 25.3 mL to reach the equivalence point. What mass of NaClO was contained in the 100.0-mL sample of adulterated soft drink?
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alt
ons for
Free Response Questions
FRQ 1:
0/5
To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and
some inert materials, solutions with known [Co?) are prepared and absorbance of each of the
solutions is measured at the wavelength of optimum absorbance. The data are used to create a
calibration plot, shown below.
0.90-
0.80-
0.70
0.60
0.50
0.40-
0.30
0.20-
0.10-
0.00-
0.005
0.010
Concentration (M)
0.015
A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted
with water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted to
Co2+(aq).
a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74?
13
✗
b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.
0.008 mols Co
Please correct answer and don't used hand raiting
Chapter 4 Solutions
CHEMISTRY+CHEM...(LL)-W/ACCESS >CUSTOM<
Ch. 4.1 - What mass of oxygen, O2, is required to completely...Ch. 4.2 - The thermite reaction produces iron metal and...Ch. 4.4 - One method for determining the purity of a sample...Ch. 4.4 - A 0523-g sample of the unknown compound CxHy was...Ch. 4.4 - Prob. 4.5CYUCh. 4.5 - Sodium bicarbonate, NaHCO3, is used in baking...Ch. 4.5 - An experiment calls for you to use 250. mL of 1.00...Ch. 4.6 - (a) What is the pH of a solution of HCI in which...Ch. 4.7 - Prob. 4.9CYUCh. 4.8 - A 25.0-mL sample of vinegar (which contains the...
Ch. 4.8 - Hydrochloric acid. HCl, with a concentration of...Ch. 4.8 - An unknown monoprotic acid reacts with NaOH...Ch. 4.8 - Vitamin C, ascorbic acid (C6HgO6)(molar mass 176.1...Ch. 4.9 - Prob. 4.14CYUCh. 4.9 - Prob. 1.1ACPCh. 4.9 - Excess KI is added to a 100.0-mL sample of a soft...Ch. 4.9 - Prob. 3.1ACPCh. 4.9 - Identify the factor labeled 4 in the strategy...Ch. 4.9 - Identify the factor labeled 3 in this strategy...Ch. 4.9 - Prob. 4.3ACPCh. 4.9 - Prob. 4.4ACPCh. 4 - The reaction of iron(III) oxide with aluminum to...Ch. 4 - What mass of HCI, in grams, is required to react...Ch. 4 - Like many metals, aluminum reacts with a halogen...Ch. 4 - The balanced equation for the reduction of iron...Ch. 4 - Methane, CH4, burns in oxygen. (a) What are the...Ch. 4 - The formation of water-Insoluble silver chloride...Ch. 4 - The metals industry was a major source of air...Ch. 4 - Prob. 8PSCh. 4 - Chromium metal reacts with oxygen to give...Ch. 4 - Ethane, C2H6, burns in oxygen. (a) What are the...Ch. 4 - Prob. 11PSCh. 4 - Ammonia gas can be prepared by the reaction of a...Ch. 4 - The compound SF6 is made by burning sulfur in an...Ch. 4 - Disulfur dichloride, S2Cl2, is used to vulcanize...Ch. 4 - The reaction of methane and water is one way to...Ch. 4 - Aluminum chloride AlCl3, is made by treating scrap...Ch. 4 - In the thermite reaction, iron(III) oxide is...Ch. 4 - Aspirin, C6H4 (OCOCH3) CO3H, is produced by the...Ch. 4 - In Example 4.2, you found that a particular...Ch. 4 - Ammonia gas can be prepared by the following...Ch. 4 - The deep blue compound Cu(NH3)4S04 is made by the...Ch. 4 - Black smokers are found in the depths of the...Ch. 4 - The reaction of methane and water is one way to...Ch. 4 - Methanol, CH3OH, can be prepared from carbon...Ch. 4 - A mixture of CuSO4 and CuSO4.5 H2O has a mass of...Ch. 4 - A 2.634-g sample containing impure CuCl2 2 H2O was...Ch. 4 - Prob. 27PSCh. 4 - Prob. 28PSCh. 4 - Nickel(II) sulfide, NiS, occurs naturally as the...Ch. 4 - The aluminum in a 0.764-g sample of an unknown...Ch. 4 - Prob. 31PSCh. 4 - Mesitylene is a liquid hydrocarbon Burning 0.115 g...Ch. 4 - Naphthalene is a hydrocarbon that once was used in...Ch. 4 - Azulene is a beautiful blue hydrocarbon. If 0.106...Ch. 4 - An unknown compound has the formula CxHyOz. You...Ch. 4 - An unknown compound has the formula CxHyOz. You...Ch. 4 - Nickel forms a compound with carbon monoxide,...Ch. 4 - To find the formula of a compound composed of iron...Ch. 4 - If 6.73 g of Na2CO3 is dissolved in enough water...Ch. 4 - Some potassium dichromate (K2Cr2O7), 2.335 g, is...Ch. 4 - What is the mass of solute, in grams, in 250, mL...Ch. 4 - Prob. 42PSCh. 4 - What volume of 0123 M NaOH, in milliliters,...Ch. 4 - What volume of 2.06 M KMnO4, in liters, contains...Ch. 4 - Identify the ions that exist in each aqueous...Ch. 4 - Identify the ions that exist in each aqueous...Ch. 4 - An experiment in your laboratory requires 500. mL...Ch. 4 - What mass of oxalic acid, H2C2O4, is required to...Ch. 4 - If you dilute 25.0 mL of 1.50 M hydrochloric acid...Ch. 4 - If 4.00 mL of 0.0250 M CuSO4 is diluted to 10.0 mL...Ch. 4 - Which of the following methods would you use to...Ch. 4 - Which of the following methods would you use to...Ch. 4 - You have 250. mL of 0.136 M HCl. Using a...Ch. 4 - Prob. 54PSCh. 4 - A table wine has a pH of 3.40. What is the...Ch. 4 - A saturated solution of milk of magnesia, Mg(OH)2,...Ch. 4 - Prob. 57PSCh. 4 - Prob. 58PSCh. 4 - Prob. 59PSCh. 4 - Prob. 60PSCh. 4 - Prob. 61PSCh. 4 - What mass of Na2CO3, in grams, is required for...Ch. 4 - When an electric current is passed through an...Ch. 4 - Hydrazine, N2H4, a base like ammonia, can react...Ch. 4 - In the photographic developing process, silver...Ch. 4 - You can dissolve an aluminum soft drink can in an...Ch. 4 - What volume of 0.750 M Pb(NO3)2, in milliliters,...Ch. 4 - What volume of 0.125 M oxalic acid, H2C2O4, is...Ch. 4 - What volume of 0.812 M HCI, in milliliters, is...Ch. 4 - What volume of 0.955 M HCl, in milliliters, is...Ch. 4 - If 38.55 mL of HCI is required to titrate 2.150 g...Ch. 4 - Potassium hydrogen phthalate, KHCgH4O4, is used to...Ch. 4 - You have 0.954 g of an unknown acid, H2A, which...Ch. 4 - An unknown solid acid is either citric acid or...Ch. 4 - To analyze an iron-containing compound, you...Ch. 4 - Vitamin C has the formula C6H8O6. Besides being an...Ch. 4 - Prob. 77PSCh. 4 - Suppose 16.04 g of benzene, C6H6, is burned in...Ch. 4 - The metabolic disorder diabetes causes a buildup...Ch. 4 - Your body deals with excess nitrogen by excreting...Ch. 4 - The reaction of iron metal and chlorine gas to...Ch. 4 - Prob. 83GQCh. 4 - The reaction of 750. g each of NH3 and O2 was...Ch. 4 - Sodium azide, an explosive chemical used in...Ch. 4 - Prob. 86GQCh. 4 - Prob. 87GQCh. 4 - Prob. 88GQCh. 4 - Prob. 89GQCh. 4 - A Menthol, from oil of mint, has a characteristic...Ch. 4 - Benzoquinone, a chemical used in the dye industry...Ch. 4 - Aqueous solutions of iron(II) chloride and sodium...Ch. 4 - Sulfuric acid can be prepared starting with the...Ch. 4 - Prob. 94GQCh. 4 - An unknown metal reacts with oxygen to give the...Ch. 4 - Titanium(IV) oxide, TiO2, is heated in hydrogen...Ch. 4 - Potassium perchlorate is prepared by the following...Ch. 4 - A Commercial sodium "hydrosulfite" is 90.1%...Ch. 4 - What mass of lime, CaO, can be obtained by heating...Ch. 4 - The elements silver, molybdenum, and sulfur...Ch. 4 - A mixture of butene, C4Hg, and butane, is burned...Ch. 4 - Cloth can be waterproofed by coating it with a...Ch. 4 - Copper metal can be prepared by roasting copper...Ch. 4 - Prob. 104GQCh. 4 - Sodium bicarbonate and acetic acid react according...Ch. 4 - A noncarbonated soft drink contains an unknown...Ch. 4 - Sodium thiosulfate, Na2S2O3, is used as a fixer in...Ch. 4 - You have a mixture of oxalic acid, H2C2O4, and...Ch. 4 - (a) What is the pH of a 0.105 M HCl solution? (b)...Ch. 4 - A solution of hydrochloric acid has a volume of...Ch. 4 - One half liter (500. mL) of 2.50 M HCl is mixed...Ch. 4 - A solution of hydrochloric acid has a volume of...Ch. 4 - Prob. 113GQCh. 4 - Prob. 115GQCh. 4 - Prob. 116GQCh. 4 - Gold can be dissolved from gold-bearing rock by...Ch. 4 - You mix 25.0 mL of 0.234 M FeCl3 with 42.5 mL of...Ch. 4 - Prob. 119GQCh. 4 - ATOM ECONOMY: Ethylene oxide, C2H4O, is an...Ch. 4 - Suppose you dilute 25.0 mL of a 0.110 M solution...Ch. 4 - Prob. 122ILCh. 4 - Oyster beds in the oceans require chloride ions...Ch. 4 - You wish to determine the weight percent of copper...Ch. 4 - Prob. 126ILCh. 4 - Chromium(III) chloride forms many compounds with...Ch. 4 - Thioridazine, C21H26N2S2, is a pharmaceutical...Ch. 4 - A herbicide contains 2,4-D...Ch. 4 - Sulfuric acid is listed in a catalog with a...Ch. 4 - Two beakers sit on a balance; the total mass is...Ch. 4 - A weighed sample of iron (Fe) is added to liquid...Ch. 4 - Let us explore a reaction with a limiting...Ch. 4 - Two students titrate different samples of the same...Ch. 4 - ATOM ECONOMY: Benzene, C6H6, is a common compound,...Ch. 4 - ATOM ECONOMY: Maleic anhydride, C4H2O3, can be...
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