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氮吹仪弱酸弱碱的电离常数

点击次数:2012  发布日期:2016-11-19  【打印此页
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3   一些常见的氮吹仪德州牛仔弱酸弱碱的电离常数,列于表31中: 表31 常见弱酸弱碱的电离常数 电解质电 离 平 衡 温度 t/(℃) K砓a 或K砓b*pK砓a 或pK砓b 醋酸HAcH++Ac251.76 ×1054.75 硼酸H3BO3+H2OB(OH)4+H+207.3 ×10109.14 碳酸 H2CO3+H2OH++HCO325(K1)4.30 ×1076.37HCO3+H2OH++CO2325(K2)5.61 ×101110.25 氢氰酸HCNH++CN254.93 ×10109.31 氢硫酸 H2SH++HS18(K1)9.1 ×1087.04HSH++S218(K2)1.1 ×101211.96 草酸 H2C2O4H++HC2O425(K1)5.90 ×1021.23HC2O4H++C2O2425(K2)6.40 ×1054.19 蚁酸HCOOHH++HCOO201.77 ×1043.75H3PO4H++H2PO425(K1)7.52 ×1032.12 磷酸H2PO4H++HPO2425(K2)6.23 ×1087.21HPO24H++PO3425(K3)2.2 ×101312.67 亚硫酸 H2SO3H++HSO318(K1)1.54 ×1021.81HSO3H++SO2318(K2)1.02 ×1076.91 亚硝酸HNO2H++N


德州牛仔 O212.54.6 ×1043.37 QINGFUSUANHFH++F253.53 ×1043.45 GUISUAN H2SiO3H++HSiO3(CHANGWEN)2 ×10109.70HSiO3H++SiO23(CHANGWEN)1 ×101212.00 72DISANZHANG RONGYEZHONGDEHUAXUEPINGHENG  ANSHUINH3+H2ONH+ 4+OH251.77 ×1054.75   *pKZHE=lgKZHE,pKZHE=lgKZHE aabb   2.SHUIDELIZIJICHANGSHU   CHUNSHUISHIRUODIANJIEZHI,ZAISHUIRONGYEZHONGZONGCUNZAIHOBENSHENDEDIANLIPINGHENG,ZHEIKEKANZUOSUANJIAN 2 PINGHENGDEYIGETELI: H2OH++OH ZHE   SHUIDEDIANLIPINGHENG,YEKEYIYONGYIGEPINGHENGCHANGSHUKLAIBIAOSHIQITEZHENG: w ZHE K=[H+][OH] (ZAISHUIRONGYEZHONG[HO]KEKANZUOSHIBUBIANDECHANGSHU) w2   KZHE wCHENGWEISHUIDELIZIJICHANGSHU。CONGWULIHUAXUESHOUCEZHONGKECHACHUZHIDINGWENDUXIAKZHE wDEJING 14 QUEZHI。DANZAIYIBANQINGKUANGXIATONGCHANGQUKZHE w=10JINXINGJISUAN。   3.SHUIRONGYEZHONGDEpHJIQIJISUAN   TONGCHANGYONGpHBIAOSHISHUIRONGYEDESUANJIAN


XING。pHJIWEISHUIRONGYEZHONGH+LIZIDEXIANGDUINONGDUDE FUDUISHU: ZHE pH=lg[H+]=lg{c(H+)/c}   TONGYANGYEYONGpOHBIAOSHISHUIRONGYEZHONGOHLIZIXIANGDUINONGDUDEFUDUISHU: ZHE pOH=lg[OH]=lg{c(OH)/c}   ZAIRENHESHUIRONGYEZHONG,BUGUANQISHIJISHANGCHENGSUANXING、ZHONGXINGHUOSHIJIANXING,BUGUANQISHIJIDEH+LI ZINONGDUHEOHLIZINONGDUGEWEIDUOSHAO,YEBUGUANZAISHUIRONGYEZHONGSHIFOUHAICUNZAIQITAPINGHENG,YOUYU SHUIBENSHENDEDIANLIPINGHENGDECUNZAI,SHUIRONGYEZHONGDEH+LIZIYUOHLIZINONGDUDECHENGJIZONGSHIYIGE CHANGSHU。RUOYIZHONGLIZINONGDUZENGJIALE,LINGYIZHONGLIZINONGDUBIRANJIANSHAO,YIBAOCHITIXIPINGHENG。 [H+][OH]=KZHE w=1014pH+pOH=14 pH=14pOH   DANGRONGYEZHONGDE[H+]=[OH],JIpH=pOH=7SHI,RONGYECHENGZHONGXING;ERDANGpH<7, JIUSHI[H+]>107>[OH],RONGYECHENGSUANXING;DANGpH>7SHI,[H+]<107<[OH],RONG YECHENGJIANXING。   SHUIRONGYEDESUANJIANXINGSHIYOUSHUIRONGYEZHONGDESUAN、JIANDIANLIZAOCHENG[H+]、[OH]BIANHUADEJIE GUO。YINCITONGGUOSUANJIANDIANLIPINGHENGJIXIANGYINGDEPINGHENGCHANGSHU,KEYIQIUSUANRONGYEDEpH。   LI31 SHIJISUANNONGDUWEI0.10moldm3DEHAcRONGYEZHONGDEH+ ·LIZINONGDUJIOHLIZINONGDU, HAcDEDIANLIDUJIRONGYEDEpH。   JIE:SHEGAIRONGYEZHONG,HAcDEDIANLIDAPINGHENGHOU,H+LIZIDEPINGHENGNONGDUWEIxmol·dm3,HAcDEDIANLI DUWEI α   (1)DUIYUDIANLIPINGHENG:        HAcH++Ac  DIYIJIE RONGYEZHONGDESUANJIANPINGHENG73