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H3PO4çåå¸ç³»æ°=[H+]^3 /{ [H+]^3 +[H+]^2*Ka1 +[H+]*Ka1 *Ka2 +Ka1*Ka2*Ka3}
=(10^-6)^3 / { (10^-6)^3 +(10^-6)^2 *10^-2.12 +(10^-6)*(10^-2.12)* (10^-7.21 )+ (10^-2.12)* (10^-7.21 )*(10^-12.66)
=1.24*10^-4
H2PO4-çåå¸ç³»æ°=[H+]^2*Ka1 /{ [H+]^3 +[H+]^2*Ka1 +[H+]*Ka1 *Ka2 +Ka1*Ka2*Ka3}
=(10^-6)^2 *10^-2.12 / { (10^-6)^3 +(10^-6)^2 *10^-2.12 +(10^-6)*(10^-2.12)* (10^-7.21 )+ (10^-2.12)* (10^-7.21 )*(10^-12.66)
=0.941
HPO42-çåå¸ç³»æ°=[H+]*Ka1*Ka2 /{ [H+]^3 +[H+]^2*Ka1 +[H+]*Ka1 *Ka2 +Ka1*Ka2*Ka3}
=(10^-6) *(10^-2.12)* (10^-7.21 ) / { (10^-6)^3 +(10^-6)^2 *10^-2.12 +(10^-6)*(10^-2.12)* (10^-7.21 )+ (10^-2.12)* (10^-7.21 )*(10^-12.66)
=0.058
PO43-çåå¸ç³»æ°=Ka1*Ka2*Ka3 /{ [H+]^3 +[H+]^2*Ka1 +[H+]*Ka1 *Ka2 +Ka1*Ka2*Ka3}
=(10^-2.12)* (10^-7.21 ) *(10^-12.66) / { (10^-6)^3 +(10^-6)^2 *10^-2.12 +(10^-6)*(10^-2.12)* (10^-7.21 )+ (10^-2.12)* (10^-7.21 )*(10^-12.66)
=1.27*10^-8
å æ¤ H2PO4- >HPO42- >H3PO4 >PO43-
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