Một số công thức sử dụng trong điện phân - Hoá 12

1. Điện phân nóng chảy

- Ở trạng thái nóng chảy, các tinh thể chất điện phân bị phá vỡ thành các ion chuyển động hỗn loạn. Khi có dòng điện một chiều chạy qua: + Ion dương chạy về cathode (cực âm) nhận electron (bị khử). + Ion âm chạy về anode (cực dương) và nhường electron (bị oxi hoá).

Ví dụ 1: Điện phân sodium chloride (NaCl) nóng chảy điều chế Na.

* Ở cực dương (anode): sự oxi hoá ion Cl^- thành Cl₂♌: \({\rm{C}}{{\rm{l}}^ - } \to \frac{1}{2}{\rm{C}}{{\rm{l}}_{\rm{2}}}{\rm{ + e}}\)

* Ở cực âm (cathode): sự khử ion Na⁺🌜 thành Na: \({\rm{N}}{{\rm{a}}^{\rm{ + }}}{\rm{ + 1e}} \to {\rm{Na}}\)

* Phương trình điện phân:

2. Điện phân dung dịch

Cathode (-) chứa ion dương (cation)

Anode (+) chứa ion âm (anion)

Thứ tự khử ở cathode:

Au³⁺ > Ag⁺ > Hg²⁺ > Cu²⁺ > H⁺ > H₂O.

(Chỉ có ion kim loại sau Al³⁺ mới bị khử)

Mⁿ⁺ + ne \( \to \) M (M sau Al)

Hết Mⁿ⁺ thì H₂O bị khử

2H₂O+ 2e \( \to \) H₂ + 2\(O{H^ - }\) (pH >7)

Thứ tự oxi hoá ở anode:

\({S^{2 - }} > {I^ - } > B{r^ - } > C{l^ - } > O{H^ - } > {H_2}O\) (Các anion như \(NO_3^ - \), \(SO_4^{2 - }\),\(PO_4^{3 - }\),\(CO_3^{2 - }\), \({F^ - }\),\(ClO_4^ - \)coi như không bị điện phân). \({S^{2 - }}\)\( \to \) S + 2e

2X^- → X₂ + 2e ( X=Cl, Br, I)

4\(O{H^ - }\)\( \to \)O₂ + 2H₂O + 4e

Hết \(C{l^ - }\), \(O{H^ - }\)nước bị oxi hoá:

2H₂O \( \to \) O₂ + 4H⁺+ 4e (pH<7)

3. Một số công thức sử dụng trong điện phân

Định luật Faraday: \(m = \frac{{A.I.t}}{{n.F}}\) Trong đó: m khối lượng chất thu dược ở điện cực (gam) A là khối lượng mol nguyên tử thu được ở điện cực (amu) n là số electron nguyên tử hoặc ion đã cho hoặc nhận. I là cường độ dòng điện (A) t là thời gian điện phân (s) F là hằng số Faraday (F = 965000) Bước 1: Tính n e trao đổi = \(\frac{{I.t}}{F}\) Bước 2: Viết quá trình điện phân xảy ra ở 2 điện cực Bước 3: Tính lượng chất đã điện phân hoặc lượng chất thu được sau điện phân.

Chú ý: V _khí = V _{khí (anode)} + V _{khí (cathode)}

m _{dung dịch giảm} = m _{kim loại} + m _{khí thoát ra}

m _cathode = m _{kim loại.}

4. Bài tập vận dụng

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