Cho sơ đồ phản ứng: NaOH + H2SO4 -> Na2SO4 + H2O
Muốn trung hòa 100ml dung dich H2SO4 1M cần bao nhiêu l dung dịch NaOH 1M
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\(NaOH+HCl->NaCl+H_2O\\ 2NaOH+H_2SO_4->Na_2SO_4+2H_2O\\ a.V=\dfrac{0,1.1}{2}=0,05\left(L\right)\\ b.m_{ddH_2SO_4}=\dfrac{0,1.1.98}{2.0,1}=49\left(g\right)\)
\(a) 2NaOH + H_2SO_4 \to Na_2SO_4 + H_2O\\ n_{NaOH} = 2n_{H_2SO_4} = 0,1.1.2 = 0,2(mol)\\ \Rightarrow V_{dd\ NaOH} = \dfrac{0,2}{1} = 0,2(lít)\\ b) Na_2SO_3 + H_2SO_4 \to Na_2SO_4 + SO_2 + H_2O\\ n_{SO_2} = n_{Na_2SO_3} = \dfrac{12,6}{126} = 0,1(mol)\\ V_{SO_2} = 0,1.22,4 = 2,24(lít)\)
\(\left\{{}\begin{matrix}n_{HCl}=0,1.1=0,1\left(mol\right)\\n_{H_2SO_4}=0,1.1=0,1\left(mol\right)\end{matrix}\right.\)
PTHH:
\(NaOH+HCl\rightarrow NaCl+H_2O\)
0,1<------0,1
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
0,2<--------0,1
\(\Rightarrow V_{ddNaOH}=\dfrac{0,2+0,1}{1}=0,3\left(l\right)\)
Đáp án : A
nNaOH = 2nH2SO4 = 0,2 mol
=> V = 0,2 lit = 200 ml
\(n_{HCl}=0,1.1=0,1\left(mol\right);n_{H_2SO_4}=0,1.1=0,1\left(mol\right)\)
PTHH:
`NaOH + HCl -> NaCl + H_2O`
`2NaOH + H_2SO_4 -> Na_2SO_4 + 2H_2O`
Theo PT: `n_{NaOH} = 2n_{H_2SO_4} + n_{HCl} = 0,3 (mol)`
`=> V_{ddNaOH} = (0,3)/(1) = 0,3(l)`
\(n_{H_2SO_4}=0,15.1=0,15\left(mol\right)\)
PTHH: \(H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\)
________0,15------->0,3_________________________(mol)
=> \(m_{NaOH}=0,3.40=12\left(g\right)\)
=> \(m_{ddNaOH}=\dfrac{12.100}{10}=120\left(g\right)\)
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\(_{H_2SO_4}\)= \(\dfrac{100\cdot1}{1000}\)=0,1(mol)
H\(_2\)SO\(_4\) + 2NaOH → Na\(_2\)SO\(_4\) + 2H\(_2\)O
(mol) 0,1 → 0,2
⇒ V\(_{NaOH}\) = \(\dfrac{n_{NaOH}}{C_{M_{NaOH}}}\) = \(\dfrac{0,2}{1}\) = 0,2(lít)
2NaOH + H2SO4 → Na2SO4 + 2H2O
\(n_{H_2SO_4}=0,1\times1=0,1\left(mol\right)\)
Theo PT: \(n_{NaOH}=2n_{H_2SO_4}=2\times0,1=0,2\left(mol\right)\)
\(\Rightarrow V_{ddNaOH}=\dfrac{0,2}{1}=0,2\left(l\right)\)
Vậy muốn trung hòa 100 ml dung dịch H2SO4 1M cần 0,2 lít dung dịch NaOH 1M