【题文】测定晶体中KSCN的含量:称取10.0g样品,配成1000 mL溶液。量取20.00 mL溶液于锥形瓶中,加入适量稀硝酸,再加入几滴Fe(NO3)3溶液作指示剂,
向Fe(NO3)3 溶液中滴加 KSCN,然后再滴加 SnCl2,先后的颜色变化是( A)⏺A 血红色,无色;BCD 血红色,沉淀
三价铁离子，硝酸根离子，氯离子在溶液中是可以大量共存的，虽然硝酸根三价铁离子具有强氧化性，但是他们不能把氯离子氧化，当然了如果是浓硝酸溶液，有时候也可以把氯离子氧化氮在高中阶段我们不去讨论，因此他三个离子是可以大量共存的，所以说你加入硫氰酸钾后还会出现白红色溶液，注意不是红色沉淀。
Write a balanced equation with the physical states: Fe(NO_3)_3+NH_4OH to Write and balance the net ionic equation for Cu(NO3)2 + FeCl2. Write the net ionic reaction for Fe(NO_3)_3 and KSCN. Write a balanced chemical equation for the following redox reaction: I^- (...
ZnSO4 + K3PO4 = Zn3(PO4)2 + K2O4S Br2 + NaOH = NaBr + H2O + NaBrO C2H6O2 + H = C3H8 + H2O 近期平衡的方程式 練習 KSCN-++H2O-++Fe(NO3)3-++NaH2PO4-+ = KNO3-++NaSCN-++Fe2O3-++H3PO4-+ 反应物产品 K11✔️ S11✔...
向Fe(NO3)3溶液中加入铁粉,充分振荡,滴加少量盐酸酸化后,再滴入1滴KSCN溶液,溶液变红原Fe(NO3)3只有部分被Fe还 相关知识点: 试题来源: 解析 不能你明、若全部及e存为,Fe^(3+) Fe^(2+) 可有反应:3Fe^(2+)+4H^++NO_3^-=3Fe^(3+)+2H_2O+NO↑ ...
3典例2测定KSCN的含量:称取10.0g样品配成1000 mL溶液量取20.00 mL于锥形瓶中,并加入几滴Fe(NO3)3溶液用 0.1000mol/LAgNO_3 标准溶液滴定,达到滴定终点时消耗 AgNO3标准溶液20.00 mL。(1)滴定时发生的离子反应为SCN^-+Ag^+=AgSCN↓则终点时的现象是(2)KSCN的质量分数为 反馈...
g = 1 (Fe(NO3)3) h = 1 (Ag) Step 4: Substitute Coefficients and Verify Result Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. ...
One well was the stock + 0.1M Fe(NO3)3(darker red than stock), and the other well was stock + 0.1M KSCN.(even darker than when 0.1 Fe(NO3)3was added to the other well). Why? I also need a net ionic equation to explain it... but as far as I know, it's the same reaction...
Fe(NO3)32241.8597 KSCN697.1807 C2H8N2O43124.09592 产品 草酸铁硝酸钾硫脲 C6Fe2O121375.747 KNO36101.1032 CH4N2S676.12086 这个计算器将确定反应的限制试剂。 Instructions To calculate the limiting reagent, enter an equation of a chemical reaction and press the Start ...