\(m_{NaOH}=\dfrac{200.10}{100}=20\left(g\right)=>n_{NaOH}=\dfrac{20}{40}=0,5\left(mol\right)\)

PTHH: NaOH + HCl --> NaCl + H₂O

______0,5-------------->0,5

=> m_NaCl = 0,5.58,5 = 29,25(g)

m_{dd sau pư} = 200 + 100 = 300 (g)

=> \(C\%\left(NaCl\right)=\dfrac{29,25}{300}.100\%=9,75\%\)

\(n_{NaOH}=\dfrac{200.8\%}{40}=0,4\left(mol\right)\\ NaOH+HCl\rightarrow NaCl+H_2O\\ n_{HCl}=n_{NaOH}=0,4\left(mol\right)\\ CM_{HCl}=a=\dfrac{0,4}{0,8}=0,5M\)

\(n_{Na_2O}=\dfrac{12,4}{62}=0,2mol\)

\(Na_2O+H_2O\rightarrow2NaOH\)

0,2  \(\rightarrow\)    0,2   \(\rightarrow\)   0,4

\(C_{M_{NaOH}}=\dfrac{0,4}{\dfrac{500}{1000}}=0,8M\)

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56B

57C

58B

59A

60D

\(Na_2O+H_2O\rightarrow2NaOH\)

Khối lượng NaOH ban đầu:

\(m_{NaOH}=\dfrac{500.10}{100}=50g\)

Khối lượng NaOH được tạo ra từ Na2O:

\(m_{NaOH}=2.n_{Ca_2O}.M_{NaOH}=2.\dfrac{31}{62}.40=40g\)

Khối lượng NaOH sau cùng là: 50 + 40 = 90g

Khối lượng dd sau: 31 + 500 = 531g

Nồng độ % dd NaOH:

\(C\%_{NaOH}=\dfrac{90}{531}.100\%=16,95\%\)

\(a/\\MgO+2HCl \to MgCl_2+H_2O\\ n_{MgO}=\frac{8}{40}=0,2(mol)\\ b/\\ n_{HCl}=0,2.2=0,4(mol)\\ CM_{HCl}=\frac{0,4}{0,2}=2M\)

\(a)2NaOH+CuCl_2\rightarrow Cu\left(OH\right)_2+2NaCl\\ b)n_{NaOH}=\dfrac{4}{40}=0,1mol\\ n_{CuCl_2}=n_{Cu\left(OH\right)_2}=0,1:2=0,05mol\\ m_{ddCuCl_2}=\dfrac{0,05.135}{10}\cdot100=67,5g\\ c)n_{NaCl}=n_{NaOH}=0,1mol\\ C_{\%NaCl}=\dfrac{0,1.58,5}{\dfrac{4}{10}\cdot100+67,5-0,05.98}\cdot100=14,0625\%\)

\(n_{NaOH}=\dfrac{100.8%}{100\%.40}=0,2(mol)\\ n_{FeCl_2}=\dfrac{254.10\%}{100\%.127}=0,2(mol)\\ PTHH:2NaOH+FeCl_2\to Fe(OH)_2\downarrow +2NaCl\)

Vì \(\dfrac{n_{NaOH}}{2}<\dfrac{n_{FeCl_2}}{1}\) nên \(FeCl_2\) dư

\(\Rightarrow n_{Fe(OH)_2}=\dfrac{1}{2}n_{NaOH}=0,1(mol);n_{NaCl}=0,2(mol)\\ \Rightarrow m_{Fe(OH)_2}=0,1.90=9(g);m_{NaCl}=0,2.58,5=11,7(g)\\ b,C\%_{NaCl}=\dfrac{11,7}{100+254-9}.100\%=3,39\%\)

\(n_{NaOH}=0,2.0,5=0,1\left(mol\right)\\ NaOH+HCl\rightarrow NaCl+H_2O\\ n_{HCl}=n_{NaCl}=n_{NaOH}=0,1\left(mol\right)\\ a,C_{MddHCl}=\dfrac{0,1}{0,05}=2\left(M\right)\\ b,C_{MddNaCl}=\dfrac{0,1}{0,05+0,2}=0,4\left(M\right)\)