Упрощенная HTML-версия
466
MnO
4
Ǧ
/ Mn
2+
ɠԛɣɟ ԛɲɿɧ ɇɟɪɧɫɬ ɬɟԙɞɟɭɿɧ ɠԥɧɟ ɬɨɬɵԕɫɵɡ
-
ɞɚɧɞɵɪԑɵɲɬɵԙ ɠɚɪɬɵɥɚɣ ɪɟɚɤɰɢɹ ɬɟԙɞɟɭɿɧ ɠɚɡɚɦɵɡ:
MnO
4
Ǧ
+ 8 ɇ
+
+ 5 Ɲ Ɇ
n
2+
+ 4 ɇ
2
Ɉ
) Mn (a
)H(a) MnO (a lg
5
059 ,0 ) Mn /
MnO (E ) Mn /
MnO (E
2
8
4
2
4
0
2
4
ɋɭɞɵԙ ɛɟɥɫɟɧɞɿɥɿɝɿ ɇ
2
Ɉ ɬɟԙɞɟɣ ɛɿɪɥɿɤɬɿ ɚɥɚɞɵ. Ⱦɟɦɟɤ,
ɠԛɣɟɧɿԙ ɷɥɟɤɬɪɨɞɬɵԕ ɩɨɬɟɧɰɢɚɥɵ ɬɟԙ:
[ɇ
+
] = 1 ɦɨɥɶ/ɥ: ȿ
0
= 1,51 + 0,059 / 5 lg 1 = 1,51 B;
[ɇ
+
] = 1 10
2
ɦɨɥɶ/ɥ: ȿ
0
= 1,51 + 0,059 / 5 lg (1 10
Ǧ
2
)
8
= 1,32 B.
MnO
4
Ǧ
Mn
2+
ɚɣɧɚɥɭɵ ԕɵɲԕɵɥ ɨɪɬɚɧɵ ԕɚɠɟɬ ɟɬɟɞɿ,
ɫɨɧɞɵԕɬɚɧ ɫɭɬɟɝɿ ɢɨɧɵɧɵԙ (ɨɪɬɚɧɵԙ ɪɇ ɦԥɧɿɧɿԙ ɬԧɦɟɧɞɟɭɿɦɟɧ)
ɤɨɧɰɟɧɬɪɚɰɢɹɫɵɧɵԙ ԧɫɭɿɦɟɧ ɠԛɣɟɧɿԙ ɷɥɟɤɬɪɨɞɬɵԕ ɩɨɬɟɧɰɢɚɥɵ
ɇɟɪɧɫɬ ɬɟԙɞɟɭɿ ɛɨɣɵɧɲɚ ɚɪɬɚɞɵ, ɫɨԑɚɧ ɫԥɣɤɟɫ ɩɟɪɦɚɧɝɚɧɚɬ
ɢɨɧɵɧɵԙ
MnO
4
Ǧ
ɬɨɬɵԕɬɵɪԑɵɲɬɵԕ ɛɟɥɫɟɧɞɿɥɿɝɿ ɚɪɬɚɞɵ.
5
-
ɬɚɩɫɵɪɦɚ
.
30 ɦɢɧɭɬɬɚ, ɤԛɲɿ 2,5 Ⱥ ɷɥɟɤɬɪɨɥɢɬ ɟɪɿɬɿɧɞɿɫɿ
ɚɪԕɵɥɵ ɬɨԕ ԧɬɤɟɧɞɟ ɟɪɿɬɿɧɞɿɞɟɧ 2,77 ɝ ɦɟɬɚɥɥ ɛԧɥɿɧɟɞɿ.
Ɇɟɬɚɥɞɵԙ ɷɤɜɢɜɚɥɟɧɬɬɿɤ ɦɚɫɫɚɫɵɧ ɟɫɟɩɬɟԙɿɡ.
ɒɟɲɭɿ:
ɟɫɟɩɬɿԙ ɛɟɪɿɥɝɟɧɿɧ Ɏɚɪɚɞɟɣ ɡɚԙɵɧɵԙ ɬɟԙɞɟɭɿɧɟ
(I = 2,5 A; m = 2,77 ɝ; t = 30 ɦɢɧ = 1800 ɫ) ԕɨɹɦɵɡ:
ɗ (Ɇɟ) =
m F / I t = 2,77 96500 / 2,5
1800 = 59,4 ɝ/ɦɨɥɶ.
Ȼɚԕɵɥɚɭ ɬɟɫɬɟɪɿ
1.
Ɍɨɬɵԕɫɵɡɞɚɧɞɵɪԑɵɲ ԕɚɫɢɟɬɿ ɠɨԑɚɪɵ ɦɟɬɚɥɞɵ ɤԧɪɫɟɬɿԙɿɡ:
Ⱥ)
Na; E
°
Na
+
/ Na =
–
2,71 B
Ȼ)
Mg; E
°
Mg
2+
/ Mg =
–
2,37 B
ȼ
)
Al; E° Al
3+
/ Al =
–
1,66 B
Ƚ
)
Fe; E° Fe
2+
/ Fe =
–
0,44 B
Ⱦ)
Ag; E
°
Ag
+
/ Ag = + 0,80 B