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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)
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!
PTHH: \(H_2SO_4+2KOH\rightarrow K_2SO+2H_2O\)
Ta có: \(n_{H_2SO_4}=0,2\cdot1=0,2\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{KOH}=0,4\left(mol\right)\\n_{K_2SO_4}=0,2\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{ddKOH}=\dfrac{\dfrac{0,4\cdot56}{6\%}}{1,048}\approx356,2\left(ml\right)\\C_{M_{K_2SO_4}}=\dfrac{0,2}{0,2+0,3562}\approx0,36\left(M\right)\end{matrix}\right.\)
\(n_{H_2SO_4}=1.0,2=0,2\left(mol\right)\\ H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\\ 0,2.........0,4........0,2.......0,2\left(mol\right)\\ a.m_{ddKOH}=\dfrac{0,4.56.100}{6}=\dfrac{1120}{3}\left(g\right)\\ V_{ddKOH}=\dfrac{\dfrac{1120}{3}}{1,048}=\dfrac{140000}{393}\left(ml\right)\approx0,356\left(l\right)\)
\(b.C_{MddK_2SO_4}=\dfrac{0,2}{\dfrac{140000}{393}+0,2}\approx0,00056\left(M\right)\)
nH2SO4=0,02.1=0,02(ol)
a) PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O
0,04____________0,02____0,02(mol)
mNaOH=0,04.40= 1,6(g)
=>mddNaOH= (1,6.100)/20= 8(g)
b) PTHH: H2SO4 + 2 KOH -> K2SO4 + 2 H2O
0,2____________0,04(mol)
=>mKOH=0,04.56=2,24(g)
=>mddKOH= (2,24.100)/5,6=40(g)
=>VddKOH= mddKOH/DddKOH= 40/1,045=38,278(ml)
\(n_{H_2SO_4}=0,15.1=0,15\left(mol\right)\)
PT: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Theo PT: \(n_{KOH}=2n_{H_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow m_{KOH}=0,3.56=16,8\left(g\right)\)
\(\Rightarrow m_{ddKOH}=\dfrac{16,8}{5,6\%}=300\left(g\right)\)
\(\Rightarrow V_{ddKOH}=\dfrac{300}{10,45}\approx28,71\left(ml\right)\)
\(n_{H_2SO_4}=1.0,2=0,2(mol)\\ PTHH:2NaOH+H_2SO_4\to Na_2SO_4+2H_2O\\ a,n_{NaOH}=0,4(mol);n_{Na_2SO_4}=0,2(mol)\\ \Rightarrow \begin{cases} m_{Na_2SO_4}=0,2.142=28,4(g)\\ m_{dd_{NaOH}}=\dfrac{0,4.40}{20\%}=80(g) \end{cases}\\ b,2KOH+H_2SO_4\to K_2SO_4+2H_2O\\ \Rightarrow n_{KOH}=0,4(mol)\\ \Rightarrow m_{dd_{KOH}}=\dfrac{0,4.56}{5,6\%}=400(g)\\ \Rightarrow V_{dd_{KOH}}=\dfrac{400}{1,045}=382,78(ml)\)
Bước 1: nH2SO4 = VH2SO4 . CM H2SO4= 0,2 . 1 = 0,2mol
Bước 2:
PTHH: 2NaOH + H2SO4 → Na2SO4 + H2O
2 mol 1 mol
? mol 0,2mol
nNaOH=0,2.21=0,4mol.nNaOH=0,2.21=0,4mol.
m NaOH= n NaOH.MNaOH = 0,4 . (23 + 16 + 1) = 16g
Bước 3: C% = mNaOH : m dd NaOH => mdd NaOH = mNaOH : C% = 16 : 20% = 80g
a) nH2SO4 = 0,2 . 1 = 0,2 mol
H2SO4 + 2NaOH -> Na2SO4 + 2H2O
0,2 0,4
mNaOH = 0,4 . 40 = 16g
mddNaOH = \(\frac{16.100\%}{20\%}=80g\)
b) 2KOH + H2SO4 -> K2SO4 + 2H2O
0,4 <---------- 0,2
=> mKOH = 0,4 . 56 = 22,4 g
mddKOH = \(\frac{22,4.100\%}{5,6\%}=400g\)
VddKOH = \(\frac{400}{1,045}=383ml\)
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: \(n_{KOH}=2n_{H_2SO_4}=2\times0,2=0,4\left(mol\right)\)
\(\Rightarrow m_{KOH}=0,4\times56=22,4\left(g\right)\)
\(\Rightarrow m_{ddKOH}=\frac{22,4}{5,6\%}=400\left(g\right)\)
\(\Rightarrow V_{ddKOH}=\frac{400}{1,045}=382,78\left(ml\right)\)