Concept explainers
Carbon monoxide is toxic because it binds more strongly to iron in hemoglobin (Hb) than does O2. Consider the following reactions and approximate standard free energy changes:
Using these data, estimate the equilibrium constant value at 25°C for the following reaction:
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Chapter 20 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
- Platinum(II) forms many complexes, among them those with the following ligands. Give the formula and charge of each complex. (a) two ammonia molecules and one oxalate ion (C2O42-) (b) two ammonia molecules, one thiocyanate ion (SCN-), and one bromide ion (c) one ethylenediamine molecule and two nitrite ionsarrow_forwardThe compound Cr(en)2(OH)2Cl has been prepared in several isomeric forms: Isomer A is optically inactive and undergoes no reaction with either AgNO3 or en. Isomer B is optically inactive and reacts with AgNO3 to form a white precipitate, but does not react with en. Isomer C is optically active and reacts both with en and AgNO3. Assuming the coordination number of chromium is 6, identify each of the three isomers by name and draw each of the structures.Hint: For the en ligand think about what angle the donor atoms form with the metal ion.arrow_forwardThe addition of S2- ion to Fe(OH)2(s) results in the formation of FeS(s). Explain why the addition of S2- ion to Cr(OH)3(s) does not result in the formation of Cr2S3(s).arrow_forward
- Cobalt (II) carbonate is slightly soluble in water (Ksp = 1.0 x 10-10). In the presence of an excess of ammonia, Co²+ forms a complex with six ammonia ligands that is somewhat favorable (K₁ = 1.3 x 105). What is the value of the equilibrium constant (Koverall) for the overall reaction that occurs? COCO3 (s) +6 NH3 (aq) → Co(NH)32+ (aq) + CO32- (aq) 1.3 x 10-5 3.6 x 10² 7.7 x 10-16 1.3 x 105 1.0 x 10-10arrow_forwardUse the thermodynamic data given below to compute the formation constant, Kf for [Zn(NH3)4]2+ in aqueous solution at 337.0 K. Species ΔfH0kJ/mol S0J/mol/K NH3(aq) -80.29 111.3 Zn2+(aq) -153.89 -112.1 [Zn(NH3)4]2+(aq) -533.5 301 Include 3 significant figuresarrow_forwardAn aqueous solution of an unknown solute is tested with litmus paper and found to be acidic. The solution is Weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could the unknown be: KOH, NH3, HNO3, KClO2, H3PO3, or CH3COCH3?arrow_forward
- Why is Fe2+ used asan electron donor chiefly in acidic environments?arrow_forwardAmmoniacal nitrogen can be determined by treatment of the sample with chloroplatinicacid; the product is slightly soluble ammonium chloroplatinate:H 2 PtCl 6 + 4NH 4 + → (NH 4 ) 2 PtCl 6 + 2H +The precipitate decomposes on ignition, yielding metallic platinum and gaseous products(NH 4 ) 2 PtCl 6 → Pt(s) + 2Cl 2 (g) + 2NH 3 (g) + 2HCl(g)Calculate the percentage of ammonia in a sample if 0.325g gave rise to 0.653g of platinum.arrow_forwardGiven the reaction: 2X + Cr2O3 → X2O3 + 2Cr Which of the following could be X? A Al B Ni C Sn D Pbarrow_forward
- Complete the equations of the following reactions and balance them: Na3[Cr(OH)6] + Br2 + NaOHarrow_forwardThe reaction of divalent manganese with oxygen in aqueous solution is given as follows: Mn2+ + 1/2O2(aq) + H2O = MnO2(s) + 2H+ The equilibrium constant (K) for this reaction is 23.7. It has been found that a lake water sample that contains no oxygen at 25 C, pH = 8.5, originally contained 0.6 mg/L of Mn2+. The sample was aerated (atmospheric conditions of the dissolved oxyen concentration is 9.2 mg/L) and after 10 days of contact with atmospheric oxygen, the Mn2+ concentration was 0.4 mg/L. The molecular weight of Mn is 55, O is 16 and H is 1. The change in free energy of formation at standard conditions (kcal/mole) are as follows: Mn2+ = -54.4, O2(aq) = +3.93, H2O = -56.69, MnO2(s) = -111.1, H+ = 0. (a) Assuming that the pH remains constant during aeration, will the precipitate continue to form after the measurement on the tenth day? (b) What should the Mn2+ concentration be (in moles/L) at equilibrium, assuming that pH and presence of dissolved oxygen are the same as in part "a".…arrow_forwardWhat is the oxidizing agent (oxidant) when acidified potassium permanganate reacts with hydrogen peroxide KMnO4 + H2O2arrow_forward
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