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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 = \(\frac{400}{1,045}=383ml\)
\(n_{H_2SO_4}=0,1.0,75=0,075mol\\ H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O\)
0,075 0,15 0,075 0,15
\(a)m_{K_2SO_4}=0,075.175=13,05mol\)
\(b)H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\\ n_{NaOH}=0,075.2=0,15mol\\ m_{ddNaOH}=\dfrac{0,15.40}{15\%}\cdot100\%=40g\\ V_{ddNaOH}=\dfrac{40}{1,05}=38,1ml\)
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.250ml=0,25l ; nHCl=0,25.1,5=0,375mol
KOH+HCl->KCl+H2O
1mol 1mol 1mol
0,375 0,375 0,375
VKOh=0,375/2=0,1875l
b.CM KCL=0,375/0,25=1,5M
c.NaOH+HCL=NaCl+H2O
1mol 1mol
0,375 0,375
mdd NaOH=0,375.40.100/10=150g
\(n_{H_2SO_4}=0,15.1=0,15\left(mol\right)\)
PT: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Theo PT: \(n_{KOH}=2n_{H_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow m_{KOH}=0,3.56=16,8\left(g\right)\)
\(\Rightarrow m_{ddKOH}=\dfrac{16,8}{5,6\%}=300\left(g\right)\)
\(\Rightarrow V_{ddKOH}=\dfrac{300}{10,45}\approx28,71\left(ml\right)\)
a, nH2SO4=0.02*1=0.02(mol)
H2SO4 + NaOH ➞ Na2SO4 +H2O
0.02.........0.02........0.02.........0.02.......(mol)
m dung dịch NaOH=(0.02*40)*100/20=4(g)
b) H2SO4 + KOH ➞ K2SO4 +H2O
....0.02.......0.02..........0.02......0.02...(mol)
mdung dịch KOH=(0.02*56)*100/5.6=20(g)
Vdung dịch=20/1.045=19.139(ml)