Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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 = \(\frac{400}{1,045}=383ml\)
Hòa tan với một lượng xút chứ hk phải súp bạn ơi.
Gọi x là nHCl, y là nH2SO4
nNaOH=0.5.0.04=0.02mol
=>nOH-=0.02mol
PT:
H(+)+OH(-)-->H2O
0.02<0.02
=>nH+ trong 10ml hh axit=0.02
=>nH+ trong 100ml hh axit=0.02.10=0.2mol
PT:
H(+)+OH(-)-->H2O
0.2->0.2
=>nNaOH=0.2mol
m muối=mNa(+)+mCl(-)+mSO4(2-)=23.0.2+35.5x...
< = > 35.5x+96y=8.6 (1)
Ta lại có: nH+=x+2y=0.2 (2)
Từ (1)(2)=>x=0.08, y=0.06.
Vậy [HCl]=0.08M, [H2SO4]=0.06M.
PTHH: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Ta có: \(n_{NaOH}=\dfrac{30\cdot20\%}{40}=0,15\left(mol\right)=n_{CH_3COONa}=n_{CH_3COOH}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CH_3COONa}=0,15\cdot82=12,3\left(g\right)\\C_{M_{CH_3COOH}}=\dfrac{0,15}{0,5}=0,3\left(M\right)\end{matrix}\right.\)
\(n_{CH_3COOH}=\dfrac{50.12\%}{60}=0,1mol\)
\(2CH_3COOH+Na_2CO_3\rightarrow2CH_3COONa+CO_2+H_2O\)
0,1 0,05 ( mol )
\(m_{Na_2CO_3}=0,05.106=5,3g\)
\(m_{dd_{Na_2CO_3}}=\dfrac{5,3}{8,4\%}=63,09g\)
\(m_{CH_3COOH}=\dfrac{12.50}{100}=6\left(g\right)\\ \rightarrow n_{CH_3COOH}=\dfrac{6}{60}=0,1\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 ---> 2CH3COONa + CO2 + H2O
0,1------------>0,05
=> \(m_{ddNa_2CO_3}=\dfrac{0,05.106}{8,4\%}=63,1\left(g\right)\)
b,\(n_{HCl}=0,2.2=0,4\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2
Mol: 0,2 0,4
\(\Rightarrow m_{CuO}=0,2.80=16\left(g\right)\)
c,\(n_{ZnO}=\dfrac{16,2}{81}=0,2\left(mol\right)\)
PTHH: ZnO + H2SO4 → ZnSO4 + H2
Mol: 0,2 0,2
\(\Rightarrow V_{ddH_2SO_4}=\dfrac{0,2}{2}=0,1\left(l\right)\)
d,\(n_{H_2SO_4}=2.0,1=0,2\left(mol\right)\)
PTHH: H2SO4 + 2KOH → K2SO4 + 2H2O
Mol: 0,2 0,4
\(\Rightarrow V_{ddKOH}=\dfrac{0,4}{1}=0,4\left(l\right)\)
\(m_{NaOH}=\dfrac{200\cdot10\%}{100\%}=20\left(g\right)\\ \Rightarrow n_{NaOH}=\dfrac{20}{40}=0,5\left(mol\right)\\ PTHH:2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\\ \Rightarrow n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=0,25\left(mol\right)\\ \Rightarrow m_{H_2SO_4}=0,25\cdot98=24,5\left(g\right)\)
\(n_{NaOH}=0,25.1=0,25\left(mol\right)\)
PT: \(CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\)
Theo PT: \(n_{CH_3COOH}=n_{NaOH}=0,25\left(mol\right)\)
\(\Rightarrow m_{CH_3COOH}=0,25.60=15\left(g\right)\Rightarrow m_{ddCH_3COOH}=\dfrac{15}{12\%}=125\left(g\right)\)