Axit 2 nút là gì
Axit những nấc, phân li từng nấc ra ion H+. Thường thì nấc sau yếu rộng nấc trước từ bỏ 10^4 đến 10^5 lần.
Kết luận axit 2 nút là phân li gấp đôi để ra ion H+
Ôn tập:
1. Hàng gồm các axit 2 mức là:
A. HCl, H2SO4, H2S, CH3COOH
B. H2CO3, H2SO3, H3PO4, HNO3
C. H2SO4, H2SO3, HF, HNO3
D. H2S, H2SO4, H2CO3, H2SO3
Đáp án D
2.
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Nguyên nhân h3po3 là axit 2 nấc
H3PO3 là axit 2 nấc do ta thấy vào H3PO3 thì phường ko liên kiết cùng với 3 nhóm OH cơ mà chỉ lk cùng với 2 nh OH, đồng thời này lại liên kết trực tiếp với cùng một nt H, do đó việc phân li nt H đó thoát khỏi H3PO3 là khôn cùng khó
3. Minh chứng h2s là axit 2 nấc
H2S H(+) + HS(-) ; Ka1 = 1.1*10^ -7
HS(-) H(+) + S(2-) ; 1.0*10^ -14
Tag: hai nào
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