Cr2O72-+62H+ +6 Fe3O4= 2Cr3+ + 18Fe3+ +31H2O此反应为氧化还原反应.首先根据得失电子守恒Cr2O72-中Cr为+6价,反应后全转化为+3价的Cr3+.反应中1个Cr2O72-得到2*3=6个电子Fe3O4中2个Fe为+3价,1个Fe为+2价,反应中1个Fe3O4失去1个电子,所以Cr2O72-系数为1,Cr3+ 系数为2,Fe3...
重铬酸钾(K2Cr2O7)是较强的氧化剂,在酸性条件下容易被还原成Cr3+,常用于铁矿石(主要成分为FeO和Fe2O重铬酸钾(K2Cr2O7)是较强的氧化剂,在酸性条件下容易被还原成Cr3+,常用于铁矿石(主要成分为FeO和Fe2O3)中铁含量的测定.(1)称取一定质量的K2Cr2O7配制成500mL标准溶液,在配制过程中使用的玻璃仪器,除烧杯和玻璃棒...
Balance the following redox reaction in acidic solution:H3PO2+Cr2O72−→H3PO4+Cr3+ Redox Reaction Among different types of chemical reactions, there is a one called redox reaction in which we can encounter both the processes of oxidation and reduction...
Simplify the result to get the lowest, whole integer values. a = 3 (Cr2O7{2-}) b = 2 (Fe{2+}) c = 14 (C2O4{2-}) d = 42 (H{+}) f = 2 (Cr3{3+}Fe{3+}) g = 28 (CO2) h = 21 (H2O) Step 4:...
Balance H2S + (Cr2O7)2{-} + H{+} = H2O + S + Cr3{+} Using the Algebraic Method Step 1: Label Each Compound With a Variable Label each compound (reactant or product) in the equation with a variable to represent the unknown coefficients. a H2S + b...
Answer to: Balance the equation: CH3CH2OH(aq) Cr2O7 2(aq) CH3COOH(aq) Cr3+(aq) By signing up, you'll get thousands of step-by-step solutions to...
Obtaining a stable Cr3+ phase at higher temperatures in the presence of hydraulic calcium aluminates (the phases found in calcium aluminate cement, CAC) in the Al2O3–CaO–Cr2O3 system remains a significant challenge in many application areas, as the formation of toxic, carcinogenic, and ...
另一份溶液,加热煮沸后,滴加稍过量SnCl2溶液,使Fe3+还原为Fe2+,用甲基橙除去过量SnCl2。然后用0.020 00 mol·L-1 K2Cr2O7标准溶液滴定,到达滴定终点时共用去K2Cr2O7标准溶液50.00 mL。计算聚合硫酸铁晶体中a、b、c的最简整数比。 (已知:Cr2O+6Fe2++14H+===2Cr3++6Fe3++7H2O) 答案 答案n(SO)=mol=...
Crystallization parameters of pure C12A7 polycrystals in "Ar" gas were evaluated to be m=3 and n=3 with a 3D growth mechanism of constant nuclei. Visible up-conversion emissions at 470nm and 540nm were observed from C12A7-Cr3+/Ho3+ powders under 808nm Xe lamp excitation. We proposed ...
Under approximate to 450 nm excitation, LGAP:Cr3+ shows broad NIR emission from 700 to 1100 nm with a bandwidth of approximate to 170 nm. Importantly, the fabricated pcLED demonstrates bright broadband NIR light and an excellent performance in night vision. The results promise the use of ...