需要金幣： 1000 個(gè)金幣 |
資料包括：完整論文 |  |
 |
| 轉(zhuǎn)換比率：金額 X 10=金幣數(shù)量， 例100元=1000金幣 | 論文字?jǐn)?shù)：5469 |  | |
| 折扣與優(yōu)惠：團(tuán)購(gòu)最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要：采用光譜分析方法研究了連二硫酸水溶液的穩(wěn)定性與酸度、溫度、時(shí)間的關(guān)系：當(dāng)酸度為1.0mol/L的時(shí)候，連二硫酸水溶液較穩(wěn)定，酸度增至7.0mol/L開(kāi)始分解明顯；在沸水浴條件下，酸度為1.0mol/L的時(shí)候連二硫酸即開(kāi)始分解；高氯酸濃度為6mol/L的連二硫酸溶液在一個(gè)小時(shí)內(nèi)沒(méi)有明顯的分解。研究了重量法測(cè)定連二硫酸鹽含量的條件：加入等體積的過(guò)氧化氫，加入高氯酸至濃度為7mol/L，沸水浴加熱半個(gè)小時(shí)，連二硫酸完全氧化為硫酸根，加入BaCl2溶液，生成硫酸鋇沉淀，按重量分析法測(cè)定。比較了重量法與重鉻酸鉀法測(cè)定連二硫酸的結(jié)果，二方法測(cè)定結(jié)果相近，重量法可行。 關(guān)鍵詞：連二硫酸錳；過(guò)氧化氫；紫外光譜；重量法
Abstract:The relationship of stability of dithionic acid with acidity, temperature and time was studied by spectral analysis. dithionic acid was stable in the 1.0 mol/L perchloric acid, and it became to decompose significantly when concentration of perchloric acid increased to 7.0 mol/L. In boiling water bath dithionic acid began to decompose at 1.0mol/L perchloric acid and at room temperature its decomposition didn’t observed until concentration of perchloric acid to 6 mol/L after one hour. The conditions of determing content of dithionic acid by gravimetric analysis was researched. The methode are the following: addition of isopyknic 30% H2O2 to dithionic acid solution and of perchloric acid to 7 mol/L, heating for 0.5h in boiling water, oxidation of dithionic acid to sulfate completely, addition of BaCl2 solution over stoichiometric value, content of dithionic acid is measured by Gravimetric method. Compare of concentration of dithionic acid determined by two methods showed the results was closely. The gravimetric method demonstrates feasibility of the method proposed. Key words: Manganese dithionate; Hydrogen peroxide; Ultraviolet spectrum; Gravimetric method |
