please help me to answer the questions (7-12) and (7-14) that in yellow mark !!
ID: 580826 • Letter: P
Question
please help me to answer the questions (7-12) and (7-14) that in yellow mark !!
348 PART III Chemical Reactions 7.11 Give the approximate pKs values for the following acids (b) HNO, (c) HC10, pK, = pK,= Select the best answer and give the basis for your selection (a) Thermally most stable: PH4CI PH4Br PH.I (b) Strongest acid: H2O H.S H2Se H2 Te (c) Acidic oxide: Ag.0 V20s CO Ce20, (d) Strongest acid: MgF2 MgCl2 MgBr2 (e) Stronger base (toward a proton): PH2 NH2 7.12 7.13 Give equations to explain why adding ammonium acetate to either 7.14 What are the acid-base properties expected for the following? 7.15 Transition metal ions usually are encountered in igneous rocks in low oxidation zinc amidels) in tigid solid to dissolve (a) Mn2" (b) MnV (c) MnVI"I are many of their ores found in sedimentary rocks formed by the weathering of ignens rocks? Would the following increase, decrease, or have no effect on acidity of the solution? W (a) Addition of Li3N to liquid NH, (b) Addition of HgO to an aqueous KI solution (c) Addition of SiO2 to molten FeFeO (d) Addition of CuSO4 to aqueous (NH4)2SO4 (e) Addition of Al(OH)s to NaOH (f) Addition of KHSO4 to H2S04 (g) Addition of CHCO2K to liquid NHs 7.16 7.17 Some transition metals such as vanadium and molybdenum in their highest oxidation säc a)s form aggregated poly acids. Are the poly acids formed to the greater extent in ( acidic solution (b) strongly basic solution, or (c) intermediate pH values! the i 7.18 In general, anhydrous nitrites of a given metal ion have lower thermal stabilily trates, and similarly for the sulfites and sulfates. How may this be explained? Select the best response within each horizontal group and indicate the major bo your choice Strongest protonic acicd (a) SnH* (b) NH, (c) HsIO6 SbH3 H2Te SbH3 HIO PH (d) [Fe(H20)Fe(H20)+ H20 (e) Na(H20); K(H2O) Strongest Lewis acid (f) BF, (g) BeCI, (h) B(n-Bu)s BCl, BCI B(t-Bu)s Bl3 More basic toward BMe, Et,N (i) Me,N (2-MePyExplanation / Answer
7.12
a) Phosphonium Iodide, PH4I, is the most stable of these compounds since it is formed by direct combination of phosphorus, iodine, and water in a gaseous phase.
b) The acidity depends on the bond strength of H and the other element. Accordingly, H-Te is stronger than H-Se which is stronger than H-S which is stronger than H-O. So, H2Te is the strongest acid.
c) Basic oxides are always oxides of metals. So, among these, only one non-metal oxide is present - CO which is an acidic oxide.
d) The Mg-F bond is the stronger than Mg-Br and Mg-Cl. So, MgF2 is the strongest acid.
e) The strongest base is PH2- since the P has more orbitals to accommodate the H+.
7.14
The more the oxidation state, more is the acidic nature. Hence, Mn(VII) is the most acidic among the given.
Mn(IV) has Mn in the +4 oxidation state, an intermediate value, so it is amphoteric.
Mn2+ is least in oxidation state, so most basic.
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