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ÒÑÖªFe(OH)3 ºÍNi(OH)2µÄÈܶȻý·Ö±ðΪ1.0¡Á10£­36ºÍ6¡Á10£­18£¬¶ÔÓÚԭʼŨ¶È¸÷Ϊ0.01 moldm£­3 µÄFe3+ºÍNi2+Àë×Ó»ìºÏÈÜÒº£¬ÎÒÃÇ¿ÉÒÔÕÒµ½Ò»¸öºÏÊʵÄpH·¶Î§£¬µÃµ½Fe(OH)3³Áµí£¬Ê¹Ni2+ºÍFe3+µÃµ½·ÖÀ룬¼´·ÖÈçÏÂÁ½ÖÖÇé¿ö¼ÆË㣺
    (1) ¼ÆËãFe3+Éú³ÉFe(OH)3³Áµíºó»¹Ê£ÏÂ0.1% Fe3+ʱµÄ×îСpHÖµ¡£
    (2) ¼ÆËã¸ÕºÃûÓÐNi(OH)2³ÁµíʱµÄ×î´ópHÖµ¡£


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shiningx(½ð±Ò+5,VIP+0):лл
ÈÜÒºÖб»³ÁµíÀë×ÓµÄŨ¶ÈСÓÚ1.0 ¡Á 105 mol¡¤L1ʱ,¿ÉÈÏΪ¸ÃÀë×ÓÒѱ»³ÁµíÍêÈ«.
Àý6-6 ÔÚ0.01 mol L1 µÄFeCl3ÈÜÒºÖÐ,Óû²úÉúFe(OH)3³Áµí,ÈÜÒºµÄpHÖµ×îСΪ¶àÉÙ ÈôʹFe(OH)3³ÁµíÍêÈ«,ÈÜÒºµÄpHÖµÖÁÉÙΪ¶àÉÙ ÒÑÖª: = 2.6410 39
½â Fe(OH)3³ÁµíÔÚÈÜÒºÖдæÔÚÏÂÁÐÆ½ºâ:
Fe(OH)3 (s) Fe3+ + 3 OH-
¸ù¾ÝÈܶȻý¹æÔò,Óû²úÉúFe(OH)3³Áµí,ÖÁÉÙÓ¦Âú×ã:
Q = [Fe3+][OH-]3 ¡Ý
[OH ] ¡Ý (mol L¨C1)
pOH = -lg[OH-] = 12.19
Ôò pH = 14 ¨C 12.19 = 1.81
¼´ pHÖµ²»µÃµÍÓÚ1.81,·ñÔò²»»á³öÏÖFe(OH)3³Áµí.
ÓûʹFe(OH)3³ÁµíÍêÈ«,Ôò³ÁµíºóÈÜÒºÖÐ[Fe3+]¡Ü1¡Á10-5 mol L1,´Ëʱ
(mol L¨C1)
pOH = -lg[OH] = 11.19
Ôò pH = 14 ¨C 11.19 = 2.81
¼´Fe(OH)3³ÁµíÍêȫʱ,pHÖµ²»ÄÜСÓÚ2.81,˵Ã÷pHÖµ1.81ʱ¿ªÊ¼³Áµí,pHÖµ´ïµ½2.81ʱ³ÁµíÍêÈ«.
ÓÉÒÔÉÏÀý×Ó¿ÉÖª,¶ÔÓÚÄÑÈܽðÊôÇâÑõ»¯Îï,´Ó¿ªÊ¼²úÉú³Áµíµ½³ÁµíÍêÈ«ÓÐÒ»¸öpHÖµ·¶Î§,¿ØÖÆËá¶È¶Ô³ÁµíµÄÉú³ÉºÍ³ÁµíÍêÈ«Æð×ÅÖØÒª×÷ÓÃ.Áò»¯ÎïµÄ³ÁµíÒ²ÓëÈÜÒºµÄËá¶ÈÃÜÇÐÏà¹Ø,Çë¿´ÏÂÀý.
Àý6-7 25¡æÊ±Ïòº¬ÓÐ0.001 mol L1 HClÓë0.01 mol L1 NiCl2µÄË®ÈÜÒºÖгÖÐøÍ¨ÈëH2SÆøÌå(ά³ÖÆä±¥ºÍ),ͨ¹ý¼ÆËã˵Ã÷ (1)ÊÇ·ñ»áÉú³ÉNiS³Áµí (2)Ni2+ ÊÇ·ñ³ÁµíÍêÈ« ÒÑÖª
½â (1)NiCl2ÈÜÒºÖÐ,[H+] = 0.001 mol L1 ¼´pH = 3.0
ͨÈëH2S ʹ֮ά³Ö±¥ºÍ,ËùÒÔ[H2S] = 0.1 mol L1,Ôò¿ÉÇó³öÈÜÒºÖеÄ[S2]
´ËʱÀë×Ó»ý
¹ÊÈÜÒºÖÐÓÐNiS³ÁµíÉú³É.
(2)Éú³ÉNiS³ÁµíµÄ·´Ó¦Ê½Îª
Ni2+ + H2S = NiS¡ý+ 2 H+
´Ë·´Ó¦µÄƽºâ³£Êý¿ÉÓÉÏÂÃæÁ½¸ö·´Ó¦Çó³ö:
H2S = 2 H+ + S2
Ni2+ + S2 = NiS¡ý
Á½¸ö·´Ó¦Ïà¼Ó¼´µÃNi2+ + H2S = NiS¡ý+ 2 H+,Æä·´Ó¦Æ½ºâ³£ÊýΪ
ÅжÏNi2+ ÊÇ·ñ³ÁµíÍêÈ«,Ö»Ðè¼ÆËã[ Ni2+]ÊÇ·ñСÓÚ
Éè·´Ó¦´ïƽºâʱ[ Ni2+] = x mol L1
Ni2+ + H2S NiS¡ý + 2 H+
ÆðʼŨ¶È / mol L1 0.01 0.001
ƽºâŨ¶È / mol L1 x 0.1 0.001+2(0.01x)
¹Ê
ÉèÆ½ºâʱ[ Ni2+]ºÜС,½üËÆÈÏΪ0.01- x 0.01,ÔòÉÏʽ¼ÆËãÈçÏÂ
½âµÃ
Òòx >1.0¡Á105 mol¡¤L1, ¹ÊNi2+ δÄܳÁµíÍêÈ«.
±¾ÎÄÀ´×Ô: ¸ßÖл¯Ñ§½Ì°¸Íø(http://www.hua-xue.com/) ×ªÔØÇë×¢Ã÷Ïêϸ³ö´¦£º£ºhttp://www.hua-xue.com/down/s_511.html
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