\(n_{Ca\left(OH\right)_2}=0,3\left(mol\right)\\ n_{H_3PO_4}=0,3\left(mol\right)\\ Vì:\dfrac{n_{Ca\left(OH\right)_2}}{n_{H_3PO_4}}=\dfrac{0,3}{0,3}=1\\ \Rightarrow Tạo.1.muối:CaHPO_4\\ Ca\left(OH\right)_2+H_3PO_4\rightarrow CaHPO_4+2H_2O\\ m_{\downarrow}=0\\ n_{CaHPO_4}=n_{Ca\left(OH\right)_2}=0,3\left(mol\right)\\ C_{MddCaHPO_4}=\dfrac{0,3}{0,3+0,3}=0,5\left(M\right)\)

PTHH: \(Na_2SO_4+CaCl_2\rightarrow2NaCl+CaSO_4\downarrow\)

Ta có: \(\left\{{}\begin{matrix}n_{Na_2SO_4}=0,1\cdot0,5=0,05\left(mol\right)\\n_{CaCl_2}=0,1\cdot0,4=0,04\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Na₂SO₄ dư

\(\Rightarrow\left\{{}\begin{matrix}n_{CaSO_4}=0,04\left(mol\right)\\n_{NaCl}=0,08\left(mol\right)\\n_{Na_2SO_4\left(dư\right)}=0,01\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaSO_4}=0,04\cdot136=5,44\left(g\right)\\C_{M_{NaCl}}=\dfrac{0,08}{0,1+0,1}=0,4\left(M\right)\\C_{M_{Na_2SO_4\left(dư\right)}}=\dfrac{0,01}{0,2}=0,05\left(M\right)\end{matrix}\right.\)

\(n_{CuSO_4}=\dfrac{15,2}{160}=0,095mol\\ CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

0,095          0,19              0,095            0,095

\(m_{rắn}=m_{Cu\left(OH\right)_2}=0,095.98=9,31g\\ V_{ddNaOH}=\dfrac{0,19}{2}=0,095l\\ b)C_{M_{Na_2SO_4}}=\dfrac{0,095}{0,04+0,095}\approx0,7M\\ c)Cu\left(OH\right)_2\xrightarrow[t^0]{}CuO+H_2O\)

0,095                 0,095

\(m_{rắn}=m_{CuO}=0,095.80=7,6g\)

PTHH 3ZnCl₂+2H₃PO₄----->Zn₃(PO₄)₂+6HCl

\(n_{ZnCl_2}\)=0,3.2=0,6(mol)

Theo phương trình =>\(\dfrac{1}{3}n_{ZnCl_2}=n_{Zn_3\left(PO_4\right)_2}=0,2\left(mol\right)\)

=>\(m_{Zn_3\left(PO_4\right)_2}\)=0,2.385=77(g)

Theo phương trình =>\(2n_{ZnCl_2}=n_{HCl}=1,2\left(mol\right)\)

=>\(C_{M_{HCl}}\)=\(\dfrac{1,2}{0,2+0,3}=2,4M\)

a. PTHH: 3NaOH + AlCl₃ ---> Al(OH)₃↓ + 3NaCl (1)

Ta có: \(C_{\%_{NaOH}}=\dfrac{m_{NaOH}}{100}.100\%=12\%\)

=> m_NaOH = 12(g)

=> \(n_{NaOH}=\dfrac{12}{40}=0,3\left(mol\right)\)

Ta lại có: \(C_{\%_{AlCl_3}}=\dfrac{m_{AlCl_3}}{200}.100\%=13,35\%\)

=> \(m_{AlCl_3}=26,7\left(g\right)\)

=> \(n_{AlCl_3}=\dfrac{26,7}{133,5}=0,2\left(mol\right)\)

Ta thấy: \(\dfrac{0,3}{3}< \dfrac{0,2}{1}\)

Vậy AlCl₃ dư

Theo PT₍₁₎: \(n_{Al\left(OH\right)_3}=\dfrac{1}{3}.n_{NaOH}=\dfrac{1}{3}.0,3=0,1\left(mol\right)\)

=> \(m_{Al\left(OH\right)_3}=0,1.78=7,8\left(g\right)\)

b. Ta có: \(m_{dd_{NaCl}}=12+200-7,8=204,2\left(g\right)\)

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

=> \(m_{NaCl}=0,3.58,5=17,55\left(g\right)\)

=> \(C_{\%_{NaCl}}=\dfrac{17,55}{204,2}.100\%=8,59\%\)

c. PTHH: 2Al(OH)₃ ---t^o---> Al₂O₃ + 3H₂O (2)

Theo PT₍₂₎: \(n_{Al_2O_3}=\dfrac{1}{2}.n_{Al\left(OH\right)_3}=\dfrac{1}{2}.0,1=0,05\left(mol\right)\)

=> \(m_{Al_2O_3}=0,05.102=5,1\left(g\right)\)

a)PTHH: ZnCl2+2KOH---->Zn(OH)2+2KCl

b)

mZnCl2=204.10100=20,4(g)ZnCl2=204.10100=20,4(g)

nZnCl2=20,4136=0,15(mol)ZnCl2=20,4136=0,15(mol)

nKOH=112.20%56=0,4(mol)KOH=112.20%56=0,4(mol)

=> 0,15/1 <  0,4/1=> KOH dư

Theo pthh, ta có :

nCu(OH)2=nZnCl2=0,15(mol)Cu(OH)2=nZnCl2=0,15(mol)

mCu(OH)2=0,15.98=14,7(g)Cu(OH)2=0,15.98=14,7(g)

c) m dd sau pư=204+112=316(g)

Theo pthh

nKOH=2nZnCl2=0,3(mol)KOH=2nZnCl2=0,3(mol)

C% KOH=

nKCl=2nZnCl2=0,3(mol)KCl=2nZnCl2=0,3(mol)

C% KCl=