Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Gọi nồng độ mol của \(Fe_2\left(SO_4\right)_3\) và \(Ba\left(OH\right)_2\) lần lượt là x;y(mol)
\(Fe_2\left(SO_4\right)_3+3Ba\left(OH\right)_2-->2Fe\left(OH\right)_3+3BaSO_4\\ H_2SO_4+Ba\left(OH\right)_2-->BaSO_4+2H_2O\\ 2Fe\left(OH\right)_3-t^o->Fe_2O_3+3H_2O\)
Ta có: \(0,1x.160+\left(0,1y-0,004\right).233=4,925\)
Mặt khác \(0,3x=\left(0,1y-0,004\right)\)
Giải hệ ta được x;y
a/
\(CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2\downarrow+2NaCl\)
\(Cu\left(ỌH\right)_2\rightarrow CuO+H_2O\)
b/
\(n_{NaOH}=\dfrac{10}{40}=0,25\left(mol\right)\)
\(n_{Cu\left(ỌH\right)_2}=\dfrac{1}{2}n_{NaOH}=0,125\left(mol\right)\)
\(\rightarrow m_{Cu\left(OH\right)_2}=0,125.98=12,25\left(g\right)\)
\(n_{CuO}=n_{Cu\left(OH\right)_2}=0,125\left(mol\right)\)
\(\rightarrow m_{CuO}=0,125.80=10\left(g\right)\)
c/
\(V_{dd}=100+200=300\left(ml\right)=0,3\left(l\right)\)
\(n_{NaCl}=n_{NaOH}=0,25\left(mol\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,25}{0,3}\approx0,83M\)
(dư) = 0,2 - 0,1 =0, 1 (mol)
= 0,1 mol
= 0,2 M
\(C_{MddHCl}=\dfrac{n}{v}=>^nHCl=0,06\left(mol\right)\)
\(C_{MddBa\left(OH\right)_2}=\dfrac{n}{v}=>^nBa\left(OH\right)_2=0,04\left(mol\right)\)
\(2HCl+Ba\left(OH\right)_2->BaCl_2+2H_2O\)
0,06 0,03
\(\dfrac{0,06}{3}< \dfrac{0,04}{1}=>Ba\left(OH\right)_2\)dư => làm quỳ tím chuyển màu xanh
Khi cô cặn dd X thì có 0,01 mol \(Ba\left(OH\right)_2\)dư và 0,03 mol \(BaCl_2\)
=> \(^mcr=0,01.171+0,03.208=7,95\left(g\right)\)
\(NaOH+HCl\rightarrow NaCl+H_2O\)
\(n_D=n_{HCl}=n_{NaOH}=0,1\cdot0,015=1,5\cdot10^{-3}mol\)
\(C_{M_D}=\dfrac{1,5\cdot10^{-3}}{0,01}=0,15M\)
\(n_{AgCl}=\dfrac{2,87}{143,5}=0,02mol\)
\(AgNO_3+HCl\rightarrow AgCl\downarrow+HNO_3\)
0,02 0,02
\(\Rightarrow C_{M_E}=\dfrac{0,02}{0,08}=0,25M\)
Mà \(\left\{{}\begin{matrix}1\cdot C_{M_A}+3\cdot C_{M_B}=4\cdot0,15=0,6\\3\cdot C_{M_A}+C_{M_B}=4\cdot0,25=10\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}C_{M_A}=0,3M\\C_{M_B}=0,1M\end{matrix}\right.\)
\(n_{MnO_2}=\frac{69,6}{87}=0,8\left(mol\right)\)
\(PTHH:MnO_2+4HCl_{\left(\text{đ}\right)}\underrightarrow{t^o}MnCl_2+2H_2O+Cl_2\)
(mol)_____0,8_____3,2________0,8_____1,6_____0,8__
\(V_{Cl_2}=0,8.22,4=17,92\left(l\right)\)
\(n_{NaOH}=0,25.2=0,5\left(mol\right)\)
\(PTHH:2NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\)
(mol)______0,5______0,25___0,25_____0,25______
Tỉ lệ: \(\frac{0,5}{2}< \frac{0,8}{1}\rightarrow Cl_2\) dư
\(C_{M\left(NaCl\right)}=C_{M\left(NaClO\right)}=\frac{0,25}{0,25}=1\left(M\right)\)
\(n_{BaCl_2}=0,1\left(mol\right);n_{Na_2CO_3}=1,2\left(mol\right)\\ PTHH:BaCl_2+Na_2CO_3\rightarrow2NaCl+BaCO_3\downarrow\\ TL:\frac{0,1}{1}< \frac{1,2}{1}\rightarrow Na_2CO_3\cdot du\\ C_{M_{NaCl}}=\frac{0,2}{0,1+0,4}=0,4\left(M\right)\\ C_{M_{Na_2CO_3\cdot du}}=\frac{1,2-0,1}{0,1+0,4}=2,2\left(M\right)\)
\(n_{KCl}=0,1.1,5=0,15\left(mol\right)\)
\(n_{AgNO3}=0,25.1,2=0,3\left(mol\right)\)
\(PTHH:KCl+AgNO_3\rightarrow AgCl+KNO_3\left(1\right)\)
Ban đầu________0,15_0,3_______________________
Phứng__0,15______0,15____0,15____0,15
Sau______0___0,15______0,15_________0,15
a,\(m_{AgCl}=0,15.143,5=21,525\left(g\right)\)
b,\(V_{dd\left(spu\right)}=100+250=350\left(ml\right)=0,35\left(l\right)\)
\(CM_{KNO3}=\frac{0,15}{0,35}=0,43M\)
\(CM_{AgNO3\left(dư\right)}=\frac{0,15}{0,35}=0,43M\)