无机及分析化学第四章答案.doc

第四章酸碱平衡与酸碱滴定法 1、(1) Cl NH 4][][][ 3 ???? OH NH H (2)324)( CO NH][][][][2][ 3332 ??????? OH NH HCO CO HH (3)32 CO H][][][2][ 3 23 ??????? OH HCO CO H (4)42 PO NaH ][][2][][][ 34 2443 ???????? OH PO HPO PO HH (5)42SO H HCOOH ?][][2][][][ 244 ????????? OH SO HSO HCOO H 2、(1 )错;(2 )对;(3 )对。 3 、略 4、(1) L mol ?? HCN 1010 ????aK 1? CN 510 1410 ????????bK ??wbK cK 20 ?,500 /??bKc 3510 26 .110 ][ ??????????b cK OH , pOH= , pH= (2)42 HPO Na L mol ??12 .2 1??apK ,20 .7 2??apK ,36 .12 3??apK ??23][ aaKKH???,78 .9)(2/1 23?????aapK pK pH (3) Ac NH L mol 4 ?? 7514 5 410 10 10 )()(][ ????????????? HAc K NH KH aa ??, pH= (4) Cl NH L mol 4 ?? 3 NH 510 ????bK ,?4 NH 10 51410 56 .510 ????????aK ??waK cK 20 ?,500 /??aKc 61010 46 .710 56 .][ ??????????a cK H , pH= (5)422 mol ?? 2110 ????aK ,5210 ????aK , 按一元弱酸计算??waK cK 20 1?,500 / 1??aKc 2 222210 13 .52 )10 (10 ][ ????????????????H , pH= (6)43 PO HL mol ml ?? 3110 ????aK ,8210 ????aK ,13 310 ????aK , / 1 ?aK ??aK 按一元弱酸计算, ??waK cK 20 1?,500 / 1??aKc 2 323310 41 .22 )10 (10 ][ ????????????????H , pH= (7)43 PO HL mol ml ??+ NaOH L mol ml ?? pH=)( )( lg 42 431?? PO Hc PO HcpK a ?=1 1 lg12 .2?= (8)43 PO HL mol ml ??+ NaOH L mol ml ?? 5832110 19 .210