Trung hòa 20ml dd H2SO4 1M bằng dd NaOH 20%
a. Viết PTHH
b. Tính khối lượng dd NaOH can dùng
c. Nếu trung hòa dd H2SO4 trên bang dd KOH 5.6% ( D= 1.045g/ml) thì cân bao nhiêu ml dung dịch KOH
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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 = 0.2*1=0.2 mol
2NaOH + H2SO4 --> Na2SO4 + H2O
0.4________0.2
mNaOH = 0.4*40=16g
2KOH + H2SO4 --> K2SO4 + H2O
0.4______0.2
mKOH= 0.4*56=22.4g
mddKOH = 22.4*100/5.6=400g
VddKOH = 400/1.045=382.77ml
\(n_{H_2SO_4}=0,2\times1=0,2\left(mol\right)\)
H2SO4 + 2NaOH → Na2SO4 + 2H2O (1)
a) Theo PT1: \(n_{NaOH}=2n_{H_2SO_4}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{NaOH}=0,4\times40=16\left(g\right)\)
b) H2SO4 + 2KOH → K2SO4 + 2H2O (2)
Theo PT2: \(n_{KOH}=2n_{H_2SO_4}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{KOH}=0,4\times56=22,4\left(g\right)\)
\(\Rightarrow m_{ddKOH}=\frac{22,4}{5,6\%}=400\left(g\right)\)
\(\Rightarrow V_{ddKOH}=\frac{400}{1,045}=382,78\left(ml\right)\)
nH2SO4=0,02.1=0,02(mol)nH2SO4=0,02.1=0,02(mol)
PTHH: H2SO4+2NaOH→Na2SO4+2H2OH2SO4+2NaOH→Na2SO4+2H2O
pư..............0,02..........0,04..............0,02...........0,04 (mol)
⇒mNaOH=0,04.40=1,6(g)⇒mNaOH=0,04.40=1,6(g)
⇒mddNaOH(20%)=1,620%=8(g)⇒mddNaOH(20%)=1,620%=8(g)
PTHH: H2SO4+2KOH→K2SO4+2H2OH2SO4+2KOH→K2SO4+2H2O
pư............0,02............0,04............0,02..........0,04 (mol)
⇒mKOH=0,04.56=2,24(g)⇒mKOH=0,04.56=2,24(g)
⇒mddKOH(5,6%)=2,245,6%=40(g)⇒mddKOH(5,6%)=2,245,6%=40(g)
⇒VKOH=401,045≈38,28(ml)
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
=> mNaOH = 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
=> mKOH = 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
\(m_{KOH}=0,4.56=22,4g\\
m_{\text{dd}KOH}=\dfrac{22,4.100}{5,6}=400g\\
V_{\text{dd}}=\dfrac{400}{1,045}=382,7ml\)
\(V_{dd}=\dfrac{22,4}{1,045}=21,4354ml\)
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!
Đổi 100ml = 0,1 lít
Ta có: \(C_{M_{KOH}}=\dfrac{n_{KOH}}{0,1}=0,5M\)
=> \(n_{KOH}=0,05\left(mol\right)\)
a. PTHH: 2KOH + H2SO4 ---> K2SO4 + 2H2O
b. Theo PT: \(n_{H_2SO_4}=\dfrac{1}{2}.n_{KOH}=\dfrac{1}{2}.0,05=0,025\left(mol\right)\)
Vì H2SO4 là chất lỏng nên thể tích bằng số mol của chính nó.
c. PTHH: KOH + HCl ---> KCl + H2O
Theo PT: \(n_{HCl}=n_{KOH}=0,05\left(mol\right)\)
=> \(m_{HCl}=0,05.36,5=1,825\left(g\right)\)
Ta có; \(C_{\%_{HCl}}=\dfrac{1,825}{m_{dd_{HCl}}}.100\%=20\%\)
=> \(m_{dd_{HCl}}=9,125\left(g\right)\)
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
\(V_{ddH_2SO_4}=\dfrac{0,075}{1}=0,075\left(l\right)=75\left(ml\right)\)
\(n_{H2SO4}=0,02.1=0,02\left(mol\right)\)
PTHH: \(H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\)
pư..............0,02..........0,04..............0,02...........0,04 (mol)
\(\Rightarrow m_{NaOH}=0,04.40=1,6\left(g\right)\)
\(\Rightarrow m_{ddNaOH\left(20\%\right)}=\dfrac{1,6}{20\%}=8\left(g\right)\)
PTHH: \(H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\)
pư............0,02............0,04............0,02..........0,04 (mol)
\(\Rightarrow m_{KOH}=0,04.56=2,24\left(g\right)\)
\(\Rightarrow m_{ddKOH\left(5,6\%\right)}=\dfrac{2,24}{5,6\%}=40\left(g\right)\)
\(\Rightarrow V_{KOH}=\dfrac{40}{1,045}\approx38,28\left(ml\right)\)
Vậy..............
,Em cảm ơn ạ <3