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\(n_{Ba\left(OH\right)_2}=0,5.0,2=0,1\left(mol\right);n_{H_2SO_4}=0,3.0,4=0,12\left(mol\right)\)
PTHH: Ba(OH)2 + H2SO4 → BaSO4↓ + 2H2O
Mol: 0,1 0,1 0,1
Ta có: \(\dfrac{0,1}{1}< \dfrac{0,12}{1}\) ⇒ Ba(OH)2 hết, H2SO4 dư
\(C_{M_{H_2SO_4dư}}=\dfrac{0,12-0,1}{0,2+0,3}=0,04M\)
mdd sau pứ = 200.2,3+300.1,6-0,1.233 = 916,7 (g)
\(C\%_{H_2SO_4dư}=\dfrac{0,02.98.100\%}{916,7}=0,21\%\)
a/ \(n_{KOH}=0,2.1=0,2\left(mol\right);n_{H_2SO_4}=0,3.1=0,3\left(mol\right)\)
PTHH: 2KOH + H2SO4 → K2SO4 + 2H2O
Mol: 0,2 0,1 0,1
Ta có: \(\dfrac{0,2}{2}< \dfrac{0,3}{1}\) ⇒ KOH hết, H2SO4 dư
b/ \(m_{H_2SO_4dư}=\left(0,3-0,1\right).98=19,6\left(g\right)\)
c/ Vdd sau pứ = 0,2 + 0,3 = 0,5 (l)
d/ \(C_{M_{ddK_2SO_4}}=\dfrac{0,1}{0,5}=0,2M\)
\(C_{M_{ddH_2SO_4dư}}=\dfrac{0,3-0,1}{0,5}=0,4M\)
Câu 1:
a. PTHH: MgCl2 + HCl ---x--->
CaCO3 + 2HCl ---> CO2↑ + H2O + CaCl2 (1)
b. Ta có: \(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Theo PT(1): \(n_{HCl}=2.n_{CO_2}=2.0,3=0,6\left(mol\right)\)
Đổi 400ml = 0,4 lít
=> \(C_{M_{HCl}}=\dfrac{0,6}{0,4}=1,5M\)
c. PTHH: HCl + NaOH ---> NaCl + H2O (2)
Vậy chất tác dụng với nước bắp cải tím là NaCl (muối ăn.)
Vậy dung dịch sau phản ứng làm nước bắp cải tím thành màu xam lam đậm.
Câu 2:
a. PTHH: CuO + H2SO4 ---> CuSO4 + H2O
b. Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
Ta lại có: \(C_{\%_{H_2SO_4}}=\dfrac{m_{H_2SO_4}}{100}.100\%=19,6\%\)
=> \(m_{H_2SO_4}=19,6\left(g\right)\)
=> \(n_{H_2SO_4}=\dfrac{19,6}{98}=0,2\left(mol\right)\)
Ta thấy: \(\dfrac{0,1}{1}< \dfrac{0,2}{1}\)
Vậy H2SO4 dư.
Theo PT: \(n_{CuSO_4}=n_{CuO}=0,1\left(mol\right)\)
=> \(m_{CuSO_4}=0,1.160=16\left(g\right)\)
Ta có: \(m_{dd_{CuSO_4}}=8+100=108\left(g\right)\)
=> \(C_{\%_{CuSO_4}}=\dfrac{16}{108}.100\%=14,81\%\)
a) \(n_{KOH}=0,1.1=0,1\left(mol\right)\)
PTHH: 2KOH + H2SO4 → K2SO4 + 2H2O
Mol: 0,1 0,1 0,1
b) \(V_{ddH_2SO_4}=\dfrac{0,1}{0,5}=0,2\left(l\right)\)
c) \(C_{M_{ddK_2SO_4}}=\dfrac{0,1}{0,1+0,2}=0,333M\)
a) 2NaOH + H2SO4→ Na2SO4 + 2H2O
b) nNaOH = CMNaOH . V= 1. 0,1= 0,1mol
PTHH:
2NaOH + H2SO4 → Na2SO4 + 2H2O
2 1 1 2
0,1 0.05 0,05 0,1
VH2SO4 = 0,05/0,5 =0,1l
c) Vdd sau phản ứng = 0,1+0,1=0,2l
CM = 0,05/0,2 = 0,25M
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
1 1 1 1
0,3 0,3 0,3 0,3
\(n_{Mg}=\dfrac{7,2}{24}=0,3\left(mol\right)\)
a). \(n_{H2}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
⇒\(V_{H2}=n.22,4=0,3.22,4=6,72\left(l\right)\)
b). \(80ml=0,08l\)
\(n_{H2SO4}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
→\(C_M=\dfrac{n}{V}=\dfrac{0,3}{0,08}=3,75\left(M\right)\)
c). \(n_{MgSO4}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
\(V_{MgSO4}=n.22,4=0,3.22,4=6,72\left(l\right)\)
→\(C_M=\dfrac{n}{V}=\dfrac{0,3}{6,72}=0,04\left(M\right)\)
d). \(MgSO_4+Ba\left(OH\right)_2\rightarrow Mg\left(OH\right)_2+BaSO_4\downarrow\)
1 1 1 1
0,3 0,3 0,3
\(n_{BaSO4\uparrow}=\dfrac{0,3.1}{1}\)=0,3(mol)
→\(m_{BaSO4\downarrow}=n.M=0,3.233=69,9\left(g\right)\)
\(n_{Ba\left(OH\right)_2}=\dfrac{0,3.1}{1}\)=0,3(mol)
\(\rightarrow V_{ddBa\left(OH\right)_2}=\dfrac{n}{C_M}=\dfrac{0,3}{1,6}=0,1875\left(l\right)\)
100ml = 0,1l
\(n_{H2SO4}=3.0,1=0,3\left(mol\right)\)
a) Pt : \(H_2SO_4+2KOH\rightarrow K_2SO_4+2H_2O|\)
1 2 1 2
0,3 0,6 0,3
b) \(n_{K2SO4}=\dfrac{0,3.1}{1}=0,3\left(mol\right)\)
⇒ \(m_{K2SO4}=0,3.174=52,2\left(g\right)\)
c) \(n_{KOH}=\dfrac{0,3.2}{1}=0,6\left(mol\right)\)
\(V_{ddKOH}=\dfrac{0,6}{2}=0,3\left(l\right)\)
d) \(V_{ddspu}=0,1+0,3=0,4\left(l\right)\)
\(C_{M_{K2SO4}}=\dfrac{0,3}{0,4}=0,75\left(M\right)\)
Chúc bạn học tốt
\(n_{H_2SO_4}=0,4\cdot1=0,4mol\)
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)
0,8 0,4
\(V_{NaOH}=\dfrac{0,8}{0,5}=1,6l\)
1.
a, \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: CO2 + 2NaOH → Na2CO3 + H2O
Mol: 0,05 0,1
b, \(C_{M_{ddNaOH}}=\dfrac{0,1}{0,1}=1M\)
2.
a, \(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: 0,2 0,4 0,2
b,\(m_{CuO}=0,2.80=16\left(g\right)\)
c, \(C\%_{ddCuCl_2}=\dfrac{0,2.135.100\%}{16+200}=12,5\%\)
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