a, \(FeCl_3+3NaOH\rightarrow3NaCl+Fe\left(OH\right)_3\)

\(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\)

b, \(n_{FeCl_3}=0,4.2=0,8\left(mol\right)\)

Theo PT: \(n_{NaCl}=3n_{FeCl_3}=2,4\left(mol\right)\)

\(\Rightarrow C_{M_{NaCl}}=\dfrac{2,4}{0,4+0,2}=4\left(M\right)\)

c, \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=\dfrac{1}{2}n_{FeCl_3}=0,4\left(mol\right)\)

\(\Rightarrow m_{Fe_2O_3}=0,4.160=64\left(g\right)\)

\(n_{FeCl3}=2.0,4=0,8\left(mol\right)\)

PTHH : \(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)

              0,8----------------------->0,8----------->2,4

b) \(C_{MNaCl}=\dfrac{2,4}{0,4+0,2}=4M\)

c) \(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)

0,8--------------->0,4

\(\Rightarrow a=m_{Fe2O3}=0,4.160=64\left(g\right)\)

\(3NaOH+FeCl_3\rightarrow Fe\left(OH\right)_3+3NaCl\)

\(n_{NaCl}=n_{NaOH}=0,2.3=0,6\left(mol\right)\)

=> \(C_{M\left(NaCl\right)}=\dfrac{0,6}{0,2}=3M\)

\(n_{Fe\left(ỌH\right)_3}=\dfrac{1}{3}n_{NaOH}=0,2\left(mol\right)\)

\(2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe_2O_3+3H_2O\)

Ta có \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=0,1\left(mol\right)\)

=> m _Fe2O3 = 0,1 . 160=16(g)

\(a,PTHH:3NaOH+FeCl_3\rightarrow3NaCl+Fe\left(OH\right)_3\downarrow\\ 2Fe\left(OH\right)_3\rightarrow^{t^o}Fe_2O_3+3H_2O\uparrow\\ b,n_{FeCl_3}=1,5\cdot0,2=0,3\left(mol\right)\\ \Rightarrow n_{NaOH}=3n_{FeCl_3}=0,9\left(mol\right)\\ \Rightarrow V_{dd_{NaOH}}=\dfrac{0,9}{2}=0,45\left(l\right)\)

Theo đề: \(\left\{{}\begin{matrix}X:Fe\left(OH\right)_3\\A:NaCl\\Y:Fe_2O_3\end{matrix}\right.\)

Theo PT: \(n_{NaCl}=3n_{FeCl_3}=0,9\left(mol\right)\)

\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,9}{0,45+0,2}\approx1,4M\)

\(c,\) Theo PT: \(n_{Fe\left(OH\right)_3}=n_{FeCl_3}=0,3\left(mol\right);n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(OH\right)_3}=0,15\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}m_X=m_{Fe\left(OH\right)_3}=0,3\cdot107=32,1\left(g\right)\\m_Y=m_{Fe_2O_3}=0,15\cdot160=24\left(g\right)\end{matrix}\right.\)

\(n_{FeCl_3}=0.2\cdot0.4=0.08\left(mol\right)\)

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\)

\(0.08...........0.24..............0.08\)

\(2Fe\left(OH\right)_3\underrightarrow{^{^{t^0}}}Fe_2O_3+3H_2O\)

\(0.08...........0.04\)

\(m_{Fe_2O_3}=0.04\cdot160=6.4\left(g\right)\)

\(V_{dd_{NaOH}}=\dfrac{0.24}{0.5}=0.48\left(l\right)\)

\(FeCl_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaCl\) (1)

\(2Fe\left(OH\right)_3\rightarrow Fe_2O_3+3H_2O\) (2)

\(n_{FeCl_3}=0,2.0,4=0,08\left(mol\right)\)

Bảo toàn nguyên tố Fe : \(n_{FeCl_3}=2n_{Fe_2O_3}=0,08\left(mol\right)\)

=> \(n_{Fe_2O_3}=0,04\left(mol\right)\)

=> \(m_{Fe_2O_3}=0,04.160=6,4\left(g\right)\)

Theo PT (1) : \(n_{NaOH}=3n_{FeCl_3}=0,08.3=0,24\left(mol\right)\)

=> \(V_{NaOH}=\dfrac{0,24}{0,5}=0,48\left(l\right)\)

nCO2 = 0,3 mol

CO2 + Ba(OH)2 -> BaCO3 + H2O

0,3..........0,3...............0,3

mBaCO3 = 0,3 .197 = 59,1 g

CM Ba(OH)2 = 0,3 / 0,6 = 0,5 M

Chia nhỏ câu hỏi ra nhé

CaCl₂ trộn với NaOH không tạo kết tủa nha em!

thực tế thì p/ứ tạo ra Ca(OH)₂ kết tủa đó a :))

PTHH: Zn + 2HCl \(\rightarrow\) ZnCl₂ + H₂\(\uparrow\)
nZn = \(\dfrac{6,5}{65}=0,1\left(mol\right)\)
Theo PT: n_HCl = 2n_Zn =2.0,1=0,2(mol)
n_H2=n_Zn=0,1 ( mol )
=>V_H2=0,1 . 22,4= 2,24( l )
Đổi : 500ml=0,5l
=> C_M = \(\dfrac{n}{V}\) = \(\dfrac{0,2}{0,5}\) = 0,4( M )