1、0.10mol/L NaHCO3,已知H2CO3 k1=4.3*10的-7次,k2=5.6*10的-11次
2、0.10mol/LNH4Cl溶液,已知Kb(NH3)=1.8*10的-5次
1ã NaHCO3å¨è´¨å论ä¸å½ä½ä¸¤æ§ç©è´¨ï¼å¯ç¨ä¸å¼è¿ä¼¼è®¡ç®
[H+]=ï¼Ka1*Ka2ï¼^1/2=ï¼4.3*10^-7 *5.6*10^-11ï¼^1/2=4.9*10^-9
pH=-lg4.9*10^-9=8.31
2ãNH4+ <==>NH3 +H+ Ka(NH4+)=Kw/Kb(NH3)=10^-14 /1.8*10^-5=5.6*10^-10
ç±äºKa(NH4+)*0.1mol/L =5.6*10^-11>20Kw
èä¸c/ka(NH4+)>500
å æ¤å¯ç¨æç®å ¬å¼è®¡ç®
[H+]=ï¼Ka*cï¼^1/2=(5.6*10^-10 *0.1)^1/2=7.45*10^-6
pH=5.13
[H+]=ï¼Ka1*Ka2ï¼^1/2=ï¼4.3*10^-7 *5.6*10^-11ï¼^1/2=4.9*10^-9
pH=-lg4.9*10^-9=8.31
2ãNH4+ <==>NH3 +H+ Ka(NH4+)=Kw/Kb(NH3)=10^-14 /1.8*10^-5=5.6*10^-10
ç±äºKa(NH4+)*0.1mol/L =5.6*10^-11>20Kw
èä¸c/ka(NH4+)>500
å æ¤å¯ç¨æç®å ¬å¼è®¡ç®
[H+]=ï¼Ka*cï¼^1/2=(5.6*10^-10 *0.1)^1/2=7.45*10^-6
pH=5.13
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