K - Skuola.net
K - Skuola.net
K - Skuola.net
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[EDTA]= la somma di tutte le specie<br />
di EDTA in forma libera<br />
Influenza del pH: α<br />
H 4 Y H 3 Y - + H +<br />
H 3 Y - H 2 Y 2- + H +<br />
H 2 Y 2- HY 3- + H +<br />
HY 3- Y 4- + H +<br />
K a1<br />
K a2<br />
K a3<br />
K a4<br />
=<br />
=<br />
=<br />
=<br />
[H + ]<br />
[H + ]<br />
[H + ]<br />
[H 4 Y]<br />
[H 3 Y - ]<br />
[H 3 Y - ]<br />
[H 2 Y 2- ]<br />
[HY 3- ]<br />
[H 2 Y 2- ]<br />
[H + ] [Y 4- ]<br />
[HY 3- ]<br />
[EDTA ]= [H 4 Y]+ [H 3 Y - ] + [H 2 Y 2- ] + [HY 3- ] + [Y 4- ] +[H 6 Y 2+ ] + [H 5 Y+ ]<br />
[H3Y- K ]<br />
[EDTA] = [H4Y] + a1 [H4Y] Ka2 Ka3 +<br />
+<br />
[H] +<br />
[H] +<br />
[H] +<br />
Le specie H 6 Y 2+<br />
e H 5 Y + a pH>2<br />
sono trascurabili<br />
[1]<br />
[H2Y2- ] Ka4 [HY3- ]<br />
+<br />
[H] +<br />
[2]