详解: (1)从表中数据可知电离常数: H3PO2HFH2CO3HCNHCO3,酸性: H3PO2HFH2CO3HCNHCO3,故答案为: C; (2)由甲胺是一元弱碱,在水中电离方程式为 CH3NH2+H2O CH3NH3+OH,可迁移到乙胺 (H2NCH2CH2NH2)的的第一步电离方程式: H2NCH2CH2NH2+H2O =[H,NCH2CH2NH3]+OH ,第二步电离方程式为 [HNCH2CH2NH2]+...
常温下,几种酸或碱的电离常数如表所示。酸或碱HCNH2CO3H3PO2(次磷酸)HFCH3NH2(甲胺)Ka或Kb6.2×10-14.5×10-7、4.7×10-115.
2.下列物质(均为0.1mol/L),不能用强酸标准溶液直接滴定的是( )A.NaCN(Ka=6.2×10-10) B.NaAC(Ka=1.7×10-5)C.HCOONa(Ka=1.8×10-4) D.CH3NH2(Ka=2.30×10-11)答案给的是B,感觉BC都对,为什么C是错的!
What is the Kb for the {eq}HCOO^- {/eq} ion? Kb and Ka: Ka is the acid dissociation constant. A large Ka value indicates a strong acid because it means the acid is largely dissociated into its ions. A Large Ka value also means the formation of products in ...
(2) 甲胺是一元弱碱,在水中电离方程式为CH3NH2+H2OCH3NH+OH- , 则乙胺(H2NCH2CH2NH2)的第一步电离方程式为。 (3) 已知:HF(aq)H+(aq)+F-(aq) ∆H<0 ①增大0.1mol/L HF溶液的浓度,HF的电离程度(填“增大”“减小”或“不变”),向HF溶液中滴加烧碱溶液,当c(HF)=10c(F-)时,c(H+)=mol/...
(2)由甲胺是一元弱碱,在水中电离方程式为CH_3NH_2+H_2O⇌CH_3NH_3^++OH^-,可迁移到乙胺(H2NCH2CH2NH2)的第一步电离方程式:H_2NCH_2CH_2NH_2+H_2O⇌[H_2NCH_2CH_2NH_3]^++OH^-,第二步电离方程式为[H_3NCH_2CH_2NH_2]^++H_2O⇌[H_3NCH_2CH_2NH_3]^(2+)+OH^-,故答案...
Explain the significance of the numerical value of an equilibrium constant in terms of the direction of equilibrium for a reaction. Write the Equilibrium Constant of reaction.(NH_4)_2CO_3(s) \rightleftharpoons 2 NH_3(g) + CO_2(g) + H_2O(g) K_c =.....
常温下,几种酸或碱的电离常数如表所示。酸或碱HCNH2CO3H3PO2(次磷酸)HFCH3NH2(甲胺)Ka或Kb6.2×10-104.5×10-7、4.7×10-115.9×10-e卷通组卷网
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【题目】气态亚硝酸(HNO2或HONO)是大气中的一种污染物。 (1)亚硝酸的电离平衡常数Ka=6.0×10﹣6,其电离方程式为___。 (2)亚硝酸分子中各原子最外层电子均达到稳定结构,其电子式为___。 (3)亚硝酸进入人体可以与二甲胺[(CH3)2NH]迅速反应生成亚硝酸胺[CH3)2N-N=O],亚硝酸胺是最重要的化学致癌物之一...