ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿¹¤Òµ·ÏË®Öг£º¬ÓÐÒ»¶¨Á¿µÄCr2O72-ºÍCrO42-£¬ËüÃÇ»á¶ÔÈËÀ༰Éú̬ϵͳ²úÉúºÜ´óΣº¦£¬±ØÐë½øÐд¦Àí¡£³£ÓõĴ¦Àí·½·¨ÓÐÒÔÏÂÁ½ÖÖ£º
·½·¨1£º»¹Ô³Áµí·¨
¸Ã·¨µÄ¹¤ÒÕÁ÷³ÌΪ£º
CrO42- Cr2O72-Cr3+Cr(OH)3
ÆäÖеڢٲ½´æÔÚƽºâ2CrO42-£¨»ÆÉ«£©+2H+Cr2O32-£¨³ÈÉ«£©+H2O
(1)ÈôƽºâÌåϵµÄpH=2£¬¸ÃÈÜÒºÏÔ______É«¡£
(2)ÄÜ˵Ã÷µÚ¢Ù²½·´Ó¦´ïƽºâ״̬µÄÊÇ_____£¨ÌîÐòºÅ£©
A£®Cr2O72-ºÍCrO42-µÄŨ¶ÈÏàͬ
B£®2v£¨Cr2O72-£©=v£¨CrO42-£©
C£®ÈÜÒºµÄÑÕÉ«²»±ä
(3)µÚ¢Ú²½ÖУ¬»¹Ô1mol Cr2O72-Àë×Ó£¬ÐèÒª______molµÄFeSO4¡¤7H2O¡£
(4)µÚ¢Û²½Éú³ÉµÄCr(OH)3ÔÚÈÜÒºÖдæÔÚÒÔϳÁµíÈܽâƽºâ£ºCr(OH)3(s) Cr3+(aq)+3OH(aq)£¬³£ÎÂÏ£¬Cr(OH)3µÄÈܶȻýKsp=c(Cr3+)¡¤c3(OH)=1032£¬ÒªÊ¹c(Cr3+)½µÖÁ105mol/L£¬ÈÜÒºµÄpHÓ¦µ÷ÖÁ______¡£
·½·¨2£ºµç½â·¨
¸Ã·¨ÓÃFe×öµç¼«µç½âº¬Cr2O72-µÄËáÐÔ·ÏË®£¬Ëæ×ŵç½âµÄ½øÐУ¬ÔÚÒõ¼«¸½½üÈÜÒºpHÉý¸ß£¬²úÉúCr(OH)3³Áµí¡£
(5)ÓÃFe×öµç¼«µÄÔÒòΪ______£¨Óõ缫·´Ó¦Ê½½âÊÍ£©¡£
(6)ÔÚÒõ¼«¸½½üÈÜÒºpHÉý¸ß£¬ÈÜÒºÖÐͬʱÉú³ÉµÄ³Áµí»¹ÓÐ______¡£
¡¾´ð°¸¡¿³È C 6 5 Ñô¼«·´Ó¦ÎªFe2e=Fe2+£¬Ìṩ»¹Ô¼ÁFe2+ Fe(OH)3
¡¾½âÎö¡¿
(1)ÈÜÒºÏÔËáÐÔ£¬c(H+)½Ï´ó£¬ÉÏÊöƽºâÓÒÒÆ£¬¸ÃÈÜÒºÏÔ³ÈÉ«£»
(2)A£®·´Ó¦¹ý³ÌÖпÉÄܳöÏÖCr2O72-ºÍCrO42-µÄŨ¶ÈÏàͬ£¬µ«·´Ó¦²»Ò»¶¨´ïµ½Æ½ºâ״̬£¬A´íÎó£»
B£®2v£¨Cr2O72-£©=v£¨CrO42-£©£¬Ã»Óбê³öÕýÄæ·´Ó¦ËÙÂÊ£¬ÎÞ·¨Åж¨·´Ó¦ÊÇ·ñ´ïµ½Æ½ºâ״̬£¬B´íÎó£»
C£®Æ½ºâʱ¸÷ÎïÖʵÄŨ¶È²»Ôٸı䣬¼´ÈÜÒºµÄÑÕÉ«²»Ôٸı䣬¿ÉÒÔÅжϷ´Ó¦´ïµ½Æ½ºâ״̬£¬CÕýÈ·£»×ÛÉÏËùÊöÑ¡C£»
(3)¸ù¾Ýµç×ÓµÃʧÊغã¿ÉÒÔÖªµÀ£¬»¹Ô1mol Cr2O72-Àë×ӵõ½Cr3+£¬µÃµ½µç×Ó£º2¡Á£¨6-3£©=6mol£¬Fe2+±»Ñõ»¯ÎªFe3+£¬ÐèÒªFeSO4¡¤7H2OµÄÎïÖʵÄÁ¿Îª=6mol£»
(4)µ±c(Cr3+)=105mol/Lʱ£¬ÈÜÒºµÄc(OH)= mol/L =109mol/L£¬c(H+)= mol/L =105mol/L£¬pH=5£¬¼´ÒªÊ¹c(Cr3+)½µÖÁ105mol/L£¬ÈÜÒºµÄpHÓ¦µ÷ÖÁ5£»
(5)ÓÃFe×öÑô¼«£¬·¢ÉúÑõ»¯·´Ó¦£¬Ê§µç×Ó£ºFe2e=Fe2+£¬²úÉúµÄÑÇÌúÀë×Ó×ö»¹Ô¼Á½«Cr2O72-»¹Ô³ÉCr3+£»
(6)ÈÜÒºÖÐÇâÀë×ÓÔÚÒõ¼«µÃµç×Ó±»»¹ÔΪÇâÆø£¬Òõ¼«¼«·´Ó¦Îª£º2H++2e=H2¡ü£¬ÈÜÒºËáÐÔ¼õÈõ£¬ÈÜÒºpHÉý¸ß£¬ÑÇÌúÀë×Ó±»Ñõ»¯ÎªÌúÀë×Ó£¬ËáÐÔ¼õÈõ£¬ÌúÀë×Ó²úÉú³ÁµíFe(OH)3¡£