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1¡¢ ÇëÍÆµ¼³ö·â±ÕºÍ¿ª·ÅÌåϵ̼ËáÆ½ºâÖÐ[H2CO3*]¡¢[HCO3-]ºÍ[CO32-]µÄ±í´ïʽ£¬²¢ÌÖÂÛ
ÕâÁ½¸öÌåϵ֮¼äµÄÇø±ð¡£ ½â: ¼ÙÉèCTΪ¸÷ÖÖ̼ËữºÏ̬Ũ¶ÈµÄ×ܺÍ,Êdz£Êý¡£*?2?C T?[H2CO3]?[HCO3]?[CO3] ?HCO???CO2???HCO??????23?3 ?????3????????C021CTCTT
* ÒÔ[H2CO3]Ϊ±äÁ¿±íʾCT£¬[HCO3?]£¬[CO32?]µÄ±íʾʽ º¬ÓÐKKºÍ[H?]12
??[H?]2[CO32?] K?[H][HCO3]K1?K2?1[HCO*][H2CO3*] 23 KK1?K22?[HCO3?]?1[HCO*][CO]?[H2CO3*]233 [H?][H?]2 2??°Ñ[HCO*],[HCO],[CO£¬?2µÃµ½:2333]´úÈëCT,?0£¬?1 ?2?[H]K[H][H]?1?12K1K1K2?1 ??(1??)??(1??)12??0?(1????2)K1[H]K1K2K2[H][H]
¿ª·ÅÌåϵ£¬¿¼Âǵ½CO2ÔÚÆøÒºÏàÖ®¼äµÄƽºâ£¬[H2CO3*] ²»±ä ¸ù¾ÝºàÀû¶¨ÂÉ£º [CO2(aq)] = KH Pco2 lg[H2CO3*] ¡Ö lg[CO2(aq)]
= lg KH + lg Pco2 = - 4.9
[H?][HCO3?]
K1?[H2CO3*] lg[HCO3-] = lg K1 + lg [H2CO3*] + pH
= -11.3 + pH K[HCO3?]?1[HCO*]23 [H?]
[H?]2[CO32?] K1?K2?[H2CO3*] lg[CO32-] = lgK1 + lgK2 + lg[H2CO3*] + 2pH
K?K[CO32?]?1?22[H2CO3*]= -21.6 + 2pH
[H]
2¡¢ Çëµ¼³ö×ÜËá¶È¡¢CO2Ëá¶È¡¢ÎÞ»úËá¶È¡¢×ܼî¶È¡¢·Ó̪¼î¶ÈºÍ¿ÁÐÔ¼î¶ÈµÄ±í´ïʽ×÷Ϊ
×Ü̼ËáÁ¿ºÍ·Ö²¼ÏµÊý£¨¦Á£©µÄº¯Êý¡£
×ÜËá¶È = [H+]+2 [H2CO3*] + [ HCO3-] - [ OH-]= CT (2¦Á0+¦Á1) +[H+]¨C KW /[H+] CO2Ëá¶È= [H+]+ [H2CO3*] - [CO32-] - [ OH-] = CT (¦Á0¨C¦Á2) + [H+] ¨C KW /[H+]
ÎÞ»úËá¶È= [H+]- [ HCO3-]-2 [CO32-] - [ OH-] = ¨C CT (¦Á1+2¦Á2) + [H+] ¨C KW /[H+]
×ܼî¶È = [OH-] + [HCO3-] + 2[CO32-]¨C [H+]= CT (¦Á1+ 2¦Á2) + KW /[H+] ¨C [H+] ·Ó̪¼î¶È=[OH-]+[CO32-]-[H2CO3*] ¨C [H+]=CT (¦Á2-¦Á0) + KW /[H+] ¨C [H+]
¿ÁÐÔ¼î¶È= [OH-]- [ HCO3-] - 2[H2CO3] ¨C [H+]= - CT (¦Á1+ 2¦Á0) + KW /[H+] ¨C [H+]
3£® ÏòÒ»º¬ÓÐ̼ËáµÄË®Ìå¼ÓÈëÖØÌ¼ËáÑΣ¬ÎÊ£º¢Ù×ÜËá¶È¡¢¢Ú×ܼî¶È¡¢¢ÛÎÞ»úËá¶È¡¢¢Ü·Ó̪¼î¶ÈºÍ¢ÝCO2Ëá¶È£¬ÊÇÔö¼Ó¡¢¼õÉÙ»¹ÊDz»±ä¡£ ¸ù¾ÝÉÏÌ嶨Òå¿ÉµÃ£º ¼ÓÈëÖØÌ¼ËáÑΣ¨HCO3-£© ¼ÓÈë̼ËáÑΣ¨CO32-£© 3¡¢ ÔÚÒ»¸öpHΪ6.5,¼î¶ÈΪ1.6mmol/LµÄË®ÌåÖÐ,Èô¼ÓÈë̼ËáÄÆÊ¹Æä¼î»¯,ÎÊÐè¼Ó¶àÉÙ
mmol/LµÄ̼ËáÄÆ²ÅÄÜʹˮÌåpHÉÏÉýÖÁ8.0.ÈôÓÃNaOHÇ¿¼î½øÐм,ÓÖÐè¼ÓÈë¶àÉÙ¼î
½â:×ܼî¶È=KW/ [H+] + CT(¦Á1 + 2¦Á2) - [H+]
×ÜËá¶È Ôö¼Ó ²»±ä ×ÜËá¶È Ôö¼Ó Ôö¼Ó ÎÞ»úËá¶È ¼õÉÙ ¼õÉÙ ·Ó̪¼î¶È ²»±ä Ôö¼Ó CO2Ëá¶È ²»±ä ¼õÉÙ CT=1/£¨¦Á1 + 2¦Á2£©{[×ܼî¶È] + [H+] - [OH-]} Áî¦Á=1/£¨¦Á1 + 2¦Á2£©
µ±pHÔÚ5¡«9·¶Î§ÄÚ,[¼î¶È]¡Ý10-3mol/Lʱ, [H+],[OH-]Ïî¿ÉÒÔºöÂÔ²»¼Æ,µÃµ½¼ò»¯Ê½:CT=¦Á[¼î¶È]
µ±pH=6.5ʱ,²é±íµÃ¦Á1=0.5845,¦Á2=8.669¡Á10-5,Ôò¦Á=1.71,CT =¦Á[¼î¶È]=1.71¡Á1.6=2.736mmol/L
Èô¼ÓÈë̼ËáÄÆ½«Ë®µÄpHÉýÖÁ8.0,²é±íµÃ¦Á¡ä=1.018,´ËʱCTÖµÓë¼î¶ÈÖµ¾ùÓб仯.Éè¼ÓÈëµÄ̼ËáÄÆÁ¿Îª¦¤[CO32-],ÔòÓÐ
CT + ¦¤[CO32-]=¦Á¡ä{[¼î¶È] + 2¦¤[CO32-]}
¼´2.736 + ¦¤[CO32-]=1.018{1.6 + 2¦¤[CO32-]} ½âµÃ,¦¤[CO32-]=1.069 mmol/L
Èô¼ÓÈëÇâÑõ»¯Äƽ«Ë®µÄpHÉýÖÁ8.0,ÆäCTÖµ²¢²»±ä»¯,¿ÉµÃ: [¼î¶È] =CT/ ¦Á¡ä=2.736/1.018=2.688 mmol/L ¼î¶ÈÔö¼ÓÖµ¾ÍÊÇÓ¦¼ÓÈëµÄÇâÑõ»¯ÄÆÇ¿¼îÁ¿: ¦¤[OH-]=2.688-1.6=1.088 mmol/L
4¡¢ ¾ßÓÐ2.00¡Á10-3mol/L¼î¶ÈµÄË®£¬pHΪ7.00£¬Çë¼ÆËã [H2CO3*]¡¢[HCO3-]¡¢ [CO32-]
ºÍ[OH-]µÄŨ¶È¸÷ÊǶàÉÙ£¿
--½â:µ±pH = 7.00ʱ,CO3µÄŨ¶ÈÓë HCO3µÄŨ¶ÈÏà±È¿ÉÒÔºöÂÔ,²é±ípH = 7.00ʱ,
--3
Ôò[HCO3] = [¼î¶È] = 2.00¡Á10mol/l¡£ +--7
[H] = [OH] = 10 mol/l¡£
¡ù+--7-3-7-4
[HCO3] = [H][HCO3]/K1 = 1.00¡Á10¡Á2.00¡Á10/(4.55¡Á10) = 4.49¡Á10mol/l¡£
--+-11-3-7-7
[CO3] = K2[HCO3]/[H] = 4.69¡Á10¡Á2.00¡Á10/(1.00¡Á10) = 9.38¡Á10 mol/l¡£
5¡¢ ÈôÓÐË®A£¬pHΪ7.5£¬Æä¼î¶ÈΪ6.38mmol/L£¬Ë®BµÄpHΪ9.0£¬¼î¶ÈΪ0.80mmol/L£¬
ÈôÒÔµÈÌå»ý»ìºÏ£¬ÎÊ»ìºÏºóµÄÖµÊǶàÉÙ£¿ ½â£º
pH?7.5,??1.069,?0?0.06626,?1?0.9324,?2?1.38?10?3CT??[¼î¶È]?1.069?6.38?6.82£¨mmol)
pH?9.0,??0.9592,?0?0.002142,?1?0.9532,?2?4.47?10?2CT??[¼î¶È]?0.9592?0.80?0.7674£¨mmol)µÈÌå»ý»ìºÏºó£º
[H2CO3]?0.5[0.06626?6.82?0.002142?0.7674]?0.225(mmol)-[HCO3]?0.5[0.9324?6.82?0.9532?0.7674]?3.545(mmol)
K1 = [H][HCO3]/[HCO3] [H]=[HCO3]K1/[HCO3]
+
-+
-
-[HCO3]3.545pH?pK?lg?6.35?lg?7.55
[H2CO3]0.225
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С[H+]Ũ¶ÈµÄË®ÖУ¬¼Ù¶¨ÈÜÒºÖнöÐγÉFe(OH)2+ºÍFe(OH)2+¶øÃ»ÓÐÐγÉFe2(OH)24+¡£Çë¼ÆËãÆ½ºâʱ¸ÃÈÜÒºÖÐ[Fe3+]¡¢[Fe(OH)2+]¡¢[Fe(OH)2+]¡¢[H+]ºÍpH¡£ ½â£ºFe?OH?3(s)?3H??Fe3??3H2O
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?2[Fe(OH)?]2][H ?7?4.9?10 [Fe3?]
C?[Fe3?]?[Fe(OH)2?]?[Fe(OH)?2]
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f(x)'?3[H?]2?1.78?10?3[H?]?4.9?10?7
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?3?8??3[H]?1.1?10£¬¿ÉÇóµÃ[H]?2.2?10
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·½³ÌʽµÄ¸ù±ØÐ¡ÓÚÈκÎÒ»¸ö£¬ËùÒÔÈ¡×îСֵ[H?]?2.2?10?3Ϊ½üËÆÖµ¡£ ?3?4?2?7??8f(x)?[H]?8.9?10[H]?4.9?10[H]?1.1?100 ?8-9-9?8?£¨1.57-1.1£©?10?8?4.7?10-9 1.06?10?4?10?1.08?10?1.1?10? f'(x)?3[H?]2?1.78?10?3[H?]?4.9?10?70 -5?6?7-5
?1.45?10?3.92?10?4.9?10?1.9?10x1?x0?f(x0)/f'(x0)?2.2?10?3?4.7?10-9/1.9?10-5?1.95?10?3?[H?]?1.95?10?3,pH?2.71 [Fe3?]?(1.95?10?3)3?9.1?103?6.75?10?5¼ÆËã
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9¡¢ ÒÑÖªFe3+ÓëË®·´Ó¦Éú³ÉµÄÖ÷ÒªÅäºÏÎPƽºâ³£ÊýÈçÏÂ: Fe3+ + H2O Fe(OH)2+ + H+ lgK1= - 2.16 Fe3+ + 2H2O Fe(OH)2+ + 2H+ lgK2= - 6.74 Fe(OH)3(s) Fe3+ + 3OH- lgK3= - 38 Fe3+ + 4H2O Fe(OH)4- + 4H+ lgK4= - 23 2Fe3+ + 2H2O Fe2(OH)24+ + 2H+ lgK= - 2.91
ÇëÓÃpc-pHͼ±íʾFe(OH)3(s)ÔÚ´¿Ë®ÖеÄÈܽâ¶ÈÓëpHµÄ¹ØÏµ. ½â:
(1)K1=[Fe(OH)2+][H+]/ [Fe3+]=[Fe(OH)2+]KW3/K3[H+]2 p[Fe(OH)2+]=3 lgKW - lgKso + 2 pH - lgK1=2 pH - 1.84 (2)K2=[Fe(OH)2+][H+]2/ [Fe3+]=[Fe(OH)2+]KW3/ K3 [H+] p[Fe(OH)2+]=3 lgKW ¨C lgK3 + pH - lgK2=pH + 2.74 (3)K3=[Fe3+][OH-]3=[Fe3+]KW3/[H+]3 p[Fe3+]=3 lgKW ¨C lgK3 + 3 pH=3 pH - 4
(4)K4=[Fe(OH)4-][H+]4/ [Fe3+]= Fe(OH)4-][H+]KW3/ K3 p[Fe(OH)4-]=3 lg KW - lgK4 - lgK3 - pH=19 - pH
(5)K=[Fe2(OH)24+][H+]2/ [Fe3+]2=[ Fe2(OH)24+]KW6/ K32[H+]4 p[Fe2(OH)24+]=6 lg KW - lgK - 2 lg K3 + 4 pH=4 pH - 5.09
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