a) Ba(OH)₂ + 2HCl --> BaCl₂ + 2H₂O

b) \(n_{Ba\left(OH\right)_2}=0,5.0,4=0,2\left(mol\right)\)

PTHH: Ba(OH)₂ + 2HCl --> BaCl₂ + 2H₂O

               0,2------>0,4----->0,2

=> \(V_{ddHCl}=\dfrac{0,4}{1,5}=\dfrac{4}{15}\left(l\right)\)

c) \(m_{BaCl_2}=0,2.208=41,6\left(g\right)\)

2HCl+Ba(OH)₂->BaCl₂+2H₂O

0,4------0,2-----------0,2 mol

n _Ba(OH)2=0,5.0,4=0,2 mol

=>V_HCl=\(\dfrac{0,4}{1,5}\)=\(\dfrac{4}{15}l\)

=>m _BaCl2=0,2.208=41,6g

\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ a,PTHH:H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\\ b,n_{KOH}=2.n_{H_2SO_4}=2.0,2=0,4\left(mol\right)\\ m_{ddKOH}=\dfrac{0,4.56.100}{11,2}=200\left(g\right)\\ c,n_{K_2SO_4}=n_{H_2SO_4}=0,2\left(mol\right)\\ \Rightarrow m_{K_2SO_4}=174.0,2=34,8\left(g\right)\)

H₂SO₄+2KOH->K₂SO₄+2H₂O

0,2---------0,4---------0,2 mol

n _H2SO4=0,2 mol

=>m _KOH =0,4.56=22,4g

=>m_dd=200g

c.m_K2SO4=0,2.174=34,8g

\(n_{Ba\left(OH\right)_2}=0,5.0,2=0,1\left(mol\right);n_{H_2SO_4}=0,3.0,4=0,12\left(mol\right)\)

PTHH: Ba(OH)₂ + H₂SO₄ → BaSO₄↓ + 2H₂O

Mol:        0,1             0,1           0,1

Ta có: \(\dfrac{0,1}{1}< \dfrac{0,12}{1}\) ⇒ Ba(OH)₂ hết, H₂SO₄ dư

\(C_{M_{H_2SO_4dư}}=\dfrac{0,12-0,1}{0,2+0,3}=0,04M\)

m_{dd sau pứ} = 200.2,3+300.1,6-0,1.233 = 916,7 (g)

\(C\%_{H_2SO_4dư}=\dfrac{0,02.98.100\%}{916,7}=0,21\%\)

a) \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)

\(n_{KOH}=\dfrac{200.11,2\%}{56}=0,4\left(mol\right)\)

\(n_{H_2SO_4}=\dfrac{1}{2}n_{KOH}=0,2\left(mol\right)\)

\(m_{ddH_2SO_4}=\dfrac{0,2.98}{10\%}=196\left(g\right)\)

b) \(n_{K_2SO_4}=\dfrac{1}{2}n_{KOH}=0,2\left(mol\right)\)

\(m_{ddsaupu}=200+196=396\left(g\right)\)

=> \(C\%_{K2SO4}=\dfrac{0,2.174}{396}.100=8,79\%\)

c) \(3KOH+FeCl_3\rightarrow Fe\left(OH\right)_3+3KCl\)

\(n_{FeCl_3}=n_{Fe\left(OH\right)_3}=\dfrac{1}{3}n_{KOH}=\dfrac{2}{15}\left(mol\right)\)

=>\(V_{FeCl_3}=\dfrac{2}{15}=0,13\left(l\right)\)

\(m_{Fe\left(OH\right)_3}=\dfrac{2}{15}.107=14,27\left(g\right)\)

KOH 11,2% hay 11,2 gam em?

1:

a) \(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)

PTHH: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\uparrow\)

______0,2------>0,2------------------->0,2_____(mol)

=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

b) \(V_{ddH_2SO_4}=\dfrac{0,2}{1}=0,2\left(l\right)\)

2:

a) 

\(n_{HCl}=2.0,2=0,4\left(mol\right)\)

PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)

______0,2<------0,4------------------>0,2______(mol)

=> \(m_{Mg}=0,2.24=4,8\left(g\right)\)

b) \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)

a) PTHH : H₂SO₄ + 2KOH ----> K₂SO₄ + 2H₂O

b) n_H2SO4 = 0,2 . 1 = 0,2(mol)

Theo pthh : n_KOH = 2n_h2so4 = 0,4 (mol)

--> m_KOH = 0,4.56 = 22,4 (g)

---> m_(ddKOH)  = 22,4 : 6 . 100 = 373,33 (g)

---> V_(ddKOH) = 373,33 : 1,048 = 356,23 (ml)

p/s: check lại hộ mình phát =)))