a) $2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O$

b)

n H2SO4 = 0,03.1 = 0,03(mol)

n NaOH = 2n H2SO4 = 0,06(mol)

=> CM NaOH = 0,06/0,05 = 1,2M

c) $H_2SO_4 + 2KOH \to K_2SO_4 + 2H_2O$

n KOH = 2n H2SO4 = 0,06(mol)

=> m KOH = 0,06.56 = 3,36 gam

=> m dd KOH = 3,36/5,6% = 60(gam)

=> V dd KOH = m/D = 60/1,045 = 57,42(ml)

nH2SO4=0,1(mol) 

a) PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O

b) 0,2___________0,1________0,1(mol)

mNaOH=0,2.40=8(g)

=>mddNaOH=(8.100)/25= 32(g)

c) mNa2SO4=0,1.142=14,2(g)

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

nKOH=0,2(mol) => mKOH=0,2.56=11,2(g)

=> mddKOH=(11,2.100)/8=140(g)

=> VddKOH= 140/1,085=129,03(ml)

Chúc em học tốt!

\(a/n_{HNO_3}=0,02.1=0,02mol\\ HNO_3+NaOH\rightarrow NaNO_3+H_2O\\ n_{NaOH}=n_{NaOH}=n_{NaNO_3}=0,02mol\\ m_{ddNaOH}=\dfrac{0,02.40}{4\%}\cdot100\%=20g\\ b/m_{ddHNO_3}=20.1,12=22,4g\\ C_{\%NaNO_3}=\dfrac{0,02.85}{22,4+20}\cdot100\%\approx4,01\%\)

a) \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: CO₂ + 2NaOH → Na₂CO₃ + H₂O

Mol:      0,15       0,3              0,15

\(C_{M_{ddNaOH}}=\dfrac{0,3}{0,2}=1,5M\)

b) Na₂CO₃: natri cacbonat

\(m_{Na_2CO_3}=0,15.106=15,9\left(g\right)\)

c) 

PTHH: 2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

Mol:       0,15          0,075

\(V_{ddH_2SO_4}=\dfrac{0,075}{1}=0,075\left(l\right)=75\left(ml\right)\)

\(n_{CO2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

a) Pt : \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O|\)

             1            2                   1               1

           0,15       0,3                0,15

\(n_{NaOH}=\dfrac{0,15.2}{1}=0,3\left(mol\right)\)

200ml = 0,2l

\(C_{M_{ddNaOH}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\)

b \(n_{Na2CO3}=\dfrac{0,3.1}{2}=0,15\left(mol\right)\)

⇒ \(m_{Na2CO3}=0,15.106=15,9\left(g\right)\)

Ten muoi thu duoc : natri cacbonat 

c) Pt : \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O|\)

                 2               1               1                2

              0,3              0,15

\(n_{H2SO4}=\dfrac{0,3.1}{2}=0,15\left(mol\right)\)

\(V_{ddH2SO4}=\dfrac{0,15}{1}=0,15\left(l\right)=150\left(ml\right)\)

 Chuc ban hoc tot

a) H₂SO₄ + 2NaOH --> Na₂SO₄ + 2H₂O

b) \(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\)

PTHH: H₂SO₄ + 2NaOH --> Na₂SO₄ + 2H₂O

                 0,2---->0,4

=> m_NaOH = 0,4.40 = 16 (g)

=> \(m_{dd.NaOH}=\dfrac{16.100}{20}=80\left(g\right)\)

c)

PTHH: H₂SO₄ + 2KOH --> K₂SO₄ + 2H₂O

                0,2---->0,4

=> m_KOH = 0,4.56 = 22,4 (g)

=> \(m_{dd.KOH}=\dfrac{22,4.100}{5,6}=400\left(g\right)\)

=> \(V_{dd.KOH}=\dfrac{400}{1,045}=382,775\left(ml\right)\)

\(n_{H_2SO_4}=0,2.1=0,2\left(mol\right)\\ pthh:H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\) 
          0,2                   0,4 
\(m_{\text{ }NaOH}=0,4.40=16g\\ m_{\text{dd}NaOH}=\dfrac{16.100}{20}=80g\) 
\(pthh:H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\) 
            0,2             0,4 
\(m_{KOH}=0,4.56=22,4g\\ m_{\text{dd}KOH}=\dfrac{22,4.100}{5,6}=400g\\ V_{\text{dd}}=\dfrac{400}{1,045}=382,7ml\)
\(V_{dd}=\dfrac{22,4}{1,045}=21,4354ml\)

\(n_{MgCO_3}=\dfrac{16,8}{84}=0,2mol\\ a.MgCO_3+H_2SO_4->MgSO_4+H_2O+CO_2\\ 2NaOH+H_2SO_{\text{4 }}->Na_2SO_4+2H_2O\\ b.n_{H_2SO_4dư}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}.80.0,1:40=0,1mol\\ n_{H_2SO_4\left(MgCO_3\right)}=0,2mol\\ c.C\%=\dfrac{98.0,3}{200}.100\%=14,7\%\\ V=0,2.22,4=4,48L\\ d.m_{ddsau}=200+16,8-44.0,2+80=288g\\ C\%_{Na_2SO_4}=\dfrac{40.0,1}{288}.100\%=1,39\%\\ C\%_{MgSO_4}=\dfrac{120.0,2}{288}.100\%=8,33\%\)

\(n_{MgCO_3}=\dfrac{16,8}{84}=0,2\left(mol\right)\)

\(n_{NaOH}=\dfrac{80}{40}=2\left(mol\right)\)

PTHH :

\(MgCO_3+H_2SO_4\rightarrow MgSO_4+H_2O+CO_2\uparrow\)

0,2              0,2                                         0,2 

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)

2                 1                 1

Vậy có 0,2 mol H2SO4 phản ứng với MgCO3 

       có 1 mol H2SO4 phản ứng với NaOH 

\(m_{H_2SO_4}=1,2.98=117,6\left(g\right)\)

\(c,C\%_{H_2SO_4}=\dfrac{117,6}{200}.100\%=58,8\%\)

\(V_{CO_2}=0,2.22,4=4,48\left(l\right)\)

\(d,m_{Na_2SO_4}=1.142=142\left(g\right)\)

\(m_{ddNaOH}=\dfrac{80.100}{10}=800\left(g\right)\)

\(m_{ddH_2SO_4dư}=1.98:58,8\%\approx166,67\left(g\right)\)

\(m_{ddNa_2SO_4}=800+166,67=966,67\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{142}{966,67}.100\%\approx14,69\%\)

nH2SO4= 2.0,05=0,1(mol)

PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O

a) nNaOH= 0,1.2=0,2(mol) => mNaOH=0,2.40=8(g)

=>mddNaOH= 8/20%= 40(g)

b) nNa2SO4=nH2SO4=0,1(mol)

=> mNa2SO4=142.0,1=14,2(g)

\(n_{H_2SO_4}=0,1.0,75=0,075mol\\ H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\)

0,075           0,15               0,075          0,15

\(a)m_{K_2SO_4}=0,075.175=13,05mol\)

\(b)H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\\ n_{NaOH}=0,075.2=0,15mol\\ m_{ddNaOH}=\dfrac{0,15.40}{15\%}\cdot100\%=40g\\ V_{ddNaOH}=\dfrac{40}{1,05}=38,1ml\)