\(n_{FeCl_3}=0.1\cdot0.1=0.01\left(mol\right)\)

\(n_{NaOH}=0.5\cdot0.1=0.05\left(mol\right)\)

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

\(1............3\)

\(0.01...........0.05\)

Lập tỉ lệ : \(\dfrac{0.01}{1}< \dfrac{0.05}{3}\Rightarrow NaOHdư\)

Các chất có trong D : \(NaCl:0.03\left(mol\right),NaOH\left(dư\right):0.02\left(mol\right)\)

\(V=0.1+0.5=0.6\left(l\right)\)

\(\left[Na^+\right]=\dfrac{0.03+0.02}{0.06}=\dfrac{1}{12}\left(M\right)\)

\(\left[Cl^-\right]=\dfrac{0.03}{0.06}=0.5\left(M\right)\)

\(\left[OH^-\right]=\dfrac{0.02}{0.6}=\dfrac{1}{30}\left(M\right)\)

\(b.\)

\(m_{Fe\left(OH\right)_3}=0.01\cdot107=1.07\left(g\right)\)

\(n_{NaOH}=0.1\cdot0.1=0.01\left(mol\right)\)

\(n_{KOH}=0.1\cdot0.1=0.01\left(mol\right)\)

\(V=0.1+0.1=0.2\left(l\right)\)

\(\left[Na^+\right]=\dfrac{0.01}{0.2}=0.05\left(M\right)\)

\(\left[K^+\right]=\dfrac{0.01}{0.2}=0.05\left(M\right)\)

\(\left[OH^-\right]=\dfrac{0.01+0.01}{0.2}=0.1\left(M\right)\)

\(b.\)

\(pH=14+log\left[OH^-\right]=14+log\left(0.1\right)=13\)

\(c.\)

\(H^++OH^-\rightarrow H_2O\)

\(0.02........0.02\)

\(V_{dd_{H_2SO_4}}=\dfrac{0.02}{1}=0.02\left(l\right)\)

\(a.\)

\(n_{NaOH}=0.1\cdot0.1=0.01\left(mol\right)\)

\(n_{KOH}=0.1\cdot0.1=0.01\left(mol\right)\)

\(V=0.1+0.1=0.2\left(l\right)\)

\(\left[Na^+\right]=\dfrac{0.01}{0.2}=0.05\left(M\right)\)

\(\left[K^+\right]=\dfrac{0.01}{0.2}=0.05\left(M\right)\)

\(\left[OH^+\right]=\dfrac{0.01+0.01}{0.2}=0.1\left(M\right)\)

\(b.\)

\(pH=14+log\left(0.1\right)=13\)

\(c.\)

\(H^++OH^-\rightarrow H_2O\)

\(0.02.......0.02\)

\(V_{H_2SO_4}=\dfrac{0.02}{1}=0.02\left(l\right)\)

a) Ta có: \(n_{NaOH}=0,1\cdot0,1=n_{KOH}=0,01\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{OH^-}=0,02\left(mol\right)\\n_{Na^+}=n_{K^+}=0,01\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}\left[OH^-\right]=\dfrac{0,02}{0,2}=0,1\left(M\right)\\\left[Na^+\right]=\left[K^+\right]=\dfrac{0,01}{0,2}=0,05\left(M\right)\end{matrix}\right.\)

b) Ta có: \(pH=14+log\left[OH^-\right]=13\)

c) PT ion: \(OH^-+H^+\rightarrow H_2O\)

Theo PT ion: \(n_{H^+}=n_{OH^-}=0,02\left(mol\right)\)

\(\Rightarrow n_{H_2SO_4}=0,01\left(mol\right)\) \(\Rightarrow V_{ddH_2SO_4}=\dfrac{0,01}{1}=0,01\left(l\right)=10\left(ml\right)\)

a, \(\left[Na^+\right]=0,1\)

\(\left[K^+\right]=0,1\)

\(\left[OH^-\right]=0,2\)

\(\left[SO_4^{2-}\right]=0,2\)

\(\left[H^+\right]=0,4\)

b, \(n_{H^+}=0,1.0,4=0,04\left(mol\right)\)

\(n_{OH^-}=0,1.0,2=0,02\left(mol\right)\)

\(H^++OH^-\rightarrow H_2O\)

\(\Rightarrow n_{H^+dư}=0,02\left(mol\right)\)

\(\Rightarrow\left[H^+\right]=\dfrac{0,02}{200}=10^{-4}\)

\(\Rightarrow pH=4\)

$n_{NaOH} = n_{KOH} = 0,1.0,1 = 0,01(mol)$
$n_{H_2SO_4} = 0,02(mol)$

              OH^- + H⁺ → H₂O

       Bđ : 0,01...0,04..................(mol)

      Pư : 0,01...0,01...................(mol)

Sau pư :   0......0,03...................(mol)

$V_{dd} = 0,1 + 0,1 = 0,2(lít)$

Vậy : 

 $[K^+] = [Na^+] = \dfrac{0,01}{0,2} = 0,05M$
$[H^+] = \dfrac{0,03}{0,2} = 0,15M$
$[SO_4^{2-}] = \dfrac{0,02}{0,2} = 0,1M$

b)

$pH = -log(0,15) = 0,824$

a, \(n_{HCl}=0,2.0,1=0,02\left(mol\right)=n_{H^+}=n_{Cl^-}\)

\(n_{H_2SO_4}=0,2.0,15=0,03\left(mol\right)=n_{SO_4^{2-}}\) \(\Rightarrow n_{H^+}=2n_{H_2SO_4}=0,06\left(mol\right)\)

\(\Rightarrow\Sigma n_{H^+}=0,02+0,06=0,08\left(mol\right)\)

\(n_{Ba\left(OH\right)_2}=0,3.0,05=0,015\left(mol\right)=n_{Ba^{2+}}\) 

\(\Rightarrow n_{OH^-}=2n_{Ba\left(OH\right)_2}=0,03\left(mol\right)\)

\(H^++OH^-\rightarrow H_2O\)

0,03___0,03 (mol) ⇒ n_H⁺ dư = 0,05 (mol)

\(Ba^{2+}+SO_4^{2-}\rightarrow BaSO_4\)

0,015___0,015______0,015 (mol) ⇒ n_SO4^2- dư = 0,015 (mol)

⇒ m = m_BaSO4 = 0,015.233 = 3,495 (g)

\(\left[Cl^-\right]=\dfrac{0,02}{0,2+0,3}=0,04\left(M\right)\)

\(\left[H^+\right]=\dfrac{0,05}{0,2+0,3}=0,1\left(M\right)\)

\(\left[SO_4^{2-}\right]=\dfrac{0,015}{0,2+0,3}=0,03\left(M\right)\)

b, pH = -log[H⁺] = 1

\(n_{Al_2(SO_4)_3}=0,1.0,2=0,02(mol)\\ n_{KOH}=0,2.0,3=0,06(mol)\\ PTHH:Al_2(SO_4)_3+6KOH\to 2Al(OH)_3\downarrow+3K_2SO_4\)

Vì \(\dfrac{n_{Al_2(SO_4)_3}}{1}>\dfrac{n_{KOH}}{6}\) nên \(Al_2(SO_4)_3\) dư

\(a,n_{K_2SO_4}=\dfrac{1}{2}n_{KOH}=0,3(mol)\\ n_{Al(OH)_3}=\dfrac{1}{3}n_{KOH}=0,2(mol)\\ \Rightarrow m_{Al(OH)_3}=0,2.78=15,6(g)\\ C_{M_{K_2SO_4}}=\dfrac{0,3}{0,5}=0,6M\)

\(b,K_2SO_4\) ko tác dụng được với \(KOH\), bạn xem lại đề 

thế dd X chứa gì 
K2SO4 kh tác dụng đc mà Al2(SO4)3 tác dụng đc mà