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a) HCl +NaOH-----> NaCl + H2O
b)Ta có
n\(_{HCl}=0,4.0,5=0,2\left(mol\right)\)
m\(_{NaOH}=\frac{50.40}{100}=20\left(g\right)\)
n\(_{NaOH}=\frac{20}{40}=0,5\left(mol\right)\)
=> NaOH dư
=> dd A gồm NaOH dư và NaCl
Theo pthh
n\(_{NaOH}=n_{HCl}=0,2\left(mol\right)\)
n\(_{NaOH}dư=0,5-0,2=0,3\left(mol\right)\)
C\(_{M\left(HCl\right)}=\frac{0,3}{0,6}=0,5\left(M\right)\)
Theo pthh
n\(_{NaCl}=n_{NaOH}=0,2\left(mol\right)\)
C\(_{M\left(NaCl\right)}=\frac{0,2}{0,6}=0,33\left(M\right)\)
Chúc bạn học tốt
a) 2NaOH + Cl2 --> NaCl + NaClO + H2O
b) \(n_{Cl_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: 2NaOH + Cl2 --> NaCl + NaClO + H2O
0,1<----0,05--->0,05----->0,05
=> \(V_{ddNaOH}=\dfrac{0,1}{1}=0,1\left(l\right)\)
c)
\(\left\{{}\begin{matrix}C_{M\left(NaCl\right)}=\dfrac{0,05}{0,1}=0,5M\\C_{M\left(NaClO\right)}=\dfrac{0,05}{0,1}=0,5M\end{matrix}\right.\)
\(n_{NaOH}=0.2\cdot0.5=0.1\left(mol\right)\)
\(n_{CuSO_4}=0.1\cdot2=0.2\left(mol\right)\)
\(2NaOH+CuSO_4\rightarrow Na_2SO_4+Cu\left(OH\right)_2\)
\(0.1.............0.05...............0.05...........0.05\)
\(m_{Cu\left(OH\right)_2}=0.05\cdot98=4.9\left(g\right)\)
\(C_{M_{Na_2SO_4}}=\dfrac{0.05}{0.2+0.1}=0.167\left(M\right)\)
\(C_{M_{CuSO_4\left(dư\right)}}=\dfrac{0.2-0.05}{0.1}=1.5\left(M\right)\)
PTHH: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Ta có: \(n_{KOH}=0,2\cdot0,5=0,1\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4}=n_{K_2SO_4}=0,05\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{H_2SO_4}}=\dfrac{0,05}{0,1}=0,5\left(M\right)\\C_{M_{K_2SO_4}}=\dfrac{0,05}{0,2+0,1}\approx0,17\left(M\right)\end{matrix}\right.\)
Bài 1 :
200ml = 0,2l
100ml = 0,1l
\(n_{KOH}=0,5.0,2=0,1\left(mol\right)\)
a) Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,1 0,05 0,05
b) \(n_{H2SO4}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)
\(C_{M_{ddH2SO4}}=\dfrac{0,05}{0,1}=0,5\left(M\right)\)
c) \(n_{K2SO4}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)
\(V_{ddspu}=0,2+0,1=0,3\left(l\right)\)
\(C_{M_{K2SO4}}=\dfrac{0,05}{0,3}=\dfrac{1}{6}\left(M\right)\)
Chúc bạn học tốt
\(a,H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O\\ n_{H_2SO_4}=1.0,4=0,4\left(mol\right)\\ n_{NaOH}=0,4.2=0,8\left(mol\right)\\ b,V_{ddNaOH}=\dfrac{0,8}{0,5}=1,6\left(l\right)\\ c,n_{Na_2SO_4}=n_{H_2SO_4}=0,4\left(mol\right)\\ V_{ddNa_2SO_4}=0,4+1,6=2\left(l\right)\\ C_{MddNa_2SO_4}=\dfrac{0,4}{2}=0,2\left(M\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,1 0,4
0,1 0,2
0 0,2 0,1 0,1
\(a,V_{H_2}=0,1.22,4=2,24\left(l\right)\\ b,m_{dd}=6,5+0,4.36,5+50-0,1.2=70,9\left(g\right)\\ C\%_{ZnCl_2}=\dfrac{0,1.136}{70,9}.100\%=19,18\%\)
\(n_{H_2SO_4}=0,4\cdot1=0,4mol\)
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)
0,8 0,4
\(V_{NaOH}=\dfrac{0,8}{0,5}=1,6l\)
\(a,PTHH:Na_2CO_3+2HCl\rightarrow2NaCl+H_2O+CO_2\uparrow\\ b,n_{Na_2CO_3}=\dfrac{15,9}{106}=0,15\left(mol\right)\\ \Rightarrow n_{HCl}=0,3\left(mol\right)\\ \Rightarrow m_{CT_{HCl}}=0,3\cdot36,5=10,95\left(g\right)\\ \Rightarrow C\%_{HCl}=\dfrac{10,95}{200}\cdot100\%=5,475\%\\ c,n_{CO_2}=0,15\left(mol\right)\\ \Rightarrow V_{CO_2\left(đkc\right)}=0,15\cdot24,79=3,7185\left(l\right)\\ d,m_{CO_2}=0,15\cdot44=6,6\left(g\right)\\ n_{NaCl}=0,3\left(mol\right);n_{H_2O}=0,15\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}m_{CT_{NaCl}}=0,3\cdot58,5=17,55\left(g\right)\\m_{H_2O}=0,15\cdot18=2,7\left(g\right)\end{matrix}\right.\\ m_{dd_{NaCl}}=15,9+200-2,7-6,6=206,6\left(g\right)\\ \Rightarrow C\%_{NaCl}=\dfrac{17,55}{206,6}\cdot100\%\approx8,49\%\)
a) HCl +NaOH-----> NaCl + H2O
b)Ta có
nHCl=0,4.0,5=0,2(mol)HCl=0,4.0,5=0,2(mol)
mNaOH=50.40100=20(g)NaOH=50.40100=20(g)
nNaOH=2040=0,5(mol)NaOH=2040=0,5(mol)
=> NaOH dư
=> dd A gồm NaOH dư và NaCl
Theo pthh
nNaOH=nHCl=0,2(mol)NaOH=nHCl=0,2(mol)
nNaOHdư=0,5−0,2=0,3(mol)NaOHdư=0,5−0,2=0,3(mol)
CM(HCl)=0,30,6=0,5(M)M(HCl)=0,30,6=0,5(M)
Theo pthh
nNaCl=nNaOH=0,2(mol)NaCl=nNaOH=0,2(mol)
CM(NaCl)=0,20,6=0,33(M)M(NaCl)=0,20,6=0,33(M)
Chúc bạn học tốt
cho mình sửa lại là b = 0,33 nhé
Hoặc bạn có thể tra gg để kham khao nhé mình thật sự xin lỗi
Ht