Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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A 1.047 g sample of canned tuna was analyzed by the Kjeldahl method; 24.61 mL of 0.1180 M HCl were required to
titrate the liberated ammonia. Calculate the percentage of nitrogen in the sample.
1. 03.89%
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3. O39.9%
4. O9.38%
5. O2.10%
Calculate the pH of a 0.1 M sodium hypoiodite solution.
a Nitrogen(I) oxide and hydrogen gases react to form ammonia gas and steam.
b Hydrogen peroxide reacts with an acidic aqueous solution of sodium hypochlorite to form oxygen and chlorine gases.
C Tin metal reduces the vanadyl ion (VO²+) to vanadium(III) ions in acidic solution. Tin(II) ions are also formed.
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- 1. Which statement regarding sulphuric acid is incorrect? a. Concentrated sulfuric acid is about 78% H2SO4 by mass and 10 molar b. It is a strong acid with respect to its first step ionisation c. Its second step ionization is not complete in concentrated solutions d. It is often used as a dehydrating agent because of its strong affinity for H2O 2. Which of the following statements concerning silicon and its bonding is false? a. Silicon dioxide consists of linear molecules b. Silicon has vacant 3d orbitals in its valence shell that can accept electrons from donor atoms c. Silicon does not form very stable Si–Si bonds unless the silicon atoms are bonded to very electronegative elements d. Silicon forms its strongest single bond with oxygenarrow_forward2. An effluent waste stream contains 3300mg/L organic matter ((CH2O) suspended and dissolved) and 27mg / L ammonium ion NH4+ (as N). Write chemical equations for the complete oxidation of (CH2O) and NH4+ and calculate the total BOD of this effluent in mg/L O2arrow_forwardWhich of the following best describes why magnesium hydroxide, found in milk of magnesia, is soluble in acidic solution? According to Le Chatelier's principle, the acid will react with magnesium ions in the solution, forming magnesium hydride and causing more magnesium hydroxide to dissolve. Magnesium hydroxide does not dissolve in acidic solutions. According to Le Chatelier's principle, the acid will react with hydroxide ions in the solution, forming water and thereby decreasing the concentration of hydroxide ions in solution causing more magnesium hydroxide to dissolve. According to Le Chatelier's principle, the acid will react with hydroxide ions in the solution, forming a precipitate. According to Le Chatelier's principle, the acid will react with water in the solution, forming hydroxide ions and thereby decreasing the concentration of magnesium ions in solution causing more magnesium hydroxide to dissolve.arrow_forward
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