0.93g/cm3,質(zhì)量分數(shù)為0.182的氨水30ml:
n(NH3)=30*0.93*0.182 /17=0.30mol
50ml0.1mol/lAgNO3:
n(Ag+)=0.005mol
則總銀濃度:c(Ag)=0.005/0.1=0.05mol/L
游離的氨濃度c(NH3)=(0.30-0.005*2)/0.1=2.9mol/L
查表:累積穩(wěn)定常數(shù):β1=10^3.40 β2=10^7.40 數(shù)據(jù)來自北師大版《無機化學(xué)》
[Ag+]= c(Ag)* 1/ { 1 + β1*[NH3] + β2* [NH3]^2 }
=0.050 * 1 /{ 1 + 10^3.40 *2.9 + 10^7.40 *2.9^2}
=2.4*10^-10(mol/L)
[Ag(NH3)+]= c(Ag)* { β1*[NH3] }/ { 1 + β1*[NH3] + β2* [NH3]^2 }
=0.050 * 10^3.40 *2.9 /{ 1 + 10^3.40 *2.9 + 10^7.40 *2.9^2}
=1.7*10^-6(mol/L)
[Ag(NH3)2+]= c(Ag)* { β2* [NH3]^2 }/ { 1 + β1*[NH3] + β2* [NH3]^2 }
=0.050 * 10^7.40 *2.9^2 /{ 1 + 10^3.40 *2.9 + 10^7.40 *2.9^2}
=0.050(mol/L)