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BÀI GIẢNG CÁC PHƯƠNG PHÁP PHÂN TÍCH VÀ ỨNG DỤNG NGƯỜI SOẠN LÂM HOA HÙNG

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<strong>CÁC</strong> PHẢN <strong>ỨNG</strong> CHUẨN ĐỘ THÔNG <strong>DỤNG</strong><br />

Phản ứng tạo phức<br />

H 2− n+ n−4 +<br />

2 Ψ + M ⇄ MΨ + 2H<br />

Taïo phöùc theo tyû leä mol 1:1<br />

Khi taïo phöùc, H + thoaùtra<br />

Ñaëc ñieåm cuûa<br />

PÖ cuûaEDTA cua ⇒ Phöùc MΨ n−4 phuï thuoäc pH dd<br />

Duøng Dung dd ñeäm pH tao taïo moâi moi tröôøng tröông chuaån chuan ñoä<br />

vôùi ion kim sao cho β’ MΨ ñaït yeâu caàu ñònh löôïng.<br />

loaïi<br />

Ñieàu Ñieu kieän cuûa cua phaûn phan öùng öng chuaån chuan ñoä<br />

1/ Phöùc MΨ phaûi beàn (β’ MΨ ≥ 10 -8 ) ôû pH chuaån ñoä<br />

2/ Phöùc chæ thò-M cuõng beàn nhöng phaûi keùm beàn hôn phöùc MΨ.<br />

3/ CB taïo phöùc thöôøng chaäm ⇒ chuaån ñoä chaäm hay ñun nheï<br />

4/ Loaïi aûnh höôûng cuûa caùc ion KL nhieãu taïo phöùc beàn vôùi EDTA<br />

33

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