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nCuSO4 = 2 . 0,2 = 0,4 mol
nNaOH = 1 . 0,3 = 0,3 mol
CuSO4 + 2NaOH -> Na2SO4 + Cu(OH)2 \(\downarrow\)
0,4(dư); 0,3(hết) --->0,15 ------>0,15
Cu(OH)2 \(^{to}\rightarrow\)CuO + H2O
0,15------------->0,15
mC(CuO) = 0,15 . 80 = 12 g
CM(Na2SO4) = \(\dfrac{0,15}{0,5}\) = 0,3 M
CM(CuSO4) dư = \(\dfrac{0,25}{0,5}\) = 0,5 M
a,
nCuSO4=0,4
nNaOH=0,3
CuSO4 + 2NaOH -----> Cu(OH)2 + Na2SO4
phuong trình : 1 2
bài cho : 0,4 0,3
tỉ lệ : 0,4 < 0,15 --->CuSO4 dư
Cu(OH)2 ----> CuO + H2o
chất rắn A : Cu(OH)2
dung dịch :Na2SO4
b,
nCu(OH)2=\(\dfrac{1}{2}\)nNaOH=0,15
nCuO=nCu(OH)2=0,15
mCuO=12g
c, nNa2SO4=0,15
CM(Na2SO4)=0,15:\(\dfrac{200+300}{1000}\) = 0,3 M
PTHH: \(CuCl_2+2NaOH\rightarrow2NaCl+Cu\left(OH\right)_2\downarrow\)
\(Cu\left(OH\right)_2\xrightarrow[]{t^o}CuO+H_2O\)
Ta có: \(\left\{{}\begin{matrix}n_{CuCl_2}=0,2\cdot2=0,4\left(mol\right)\\n_{NaOH}=0,2\cdot2=0,4\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,4}{2}\) \(\Rightarrow\) CuCl2 còn dư
\(\Rightarrow\left\{{}\begin{matrix}n_{NaCl}=0,4\left(mol\right)\\n_{Cu\left(OH\right)_2}=0,2\left(mol\right)=n_{CuO}=n_{CuCl_2\left(dư\right)}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CuO}=0,2\cdot80=16\left(g\right)\\C_{M_{NaCl}}=\dfrac{0,4}{0,2+0,2}=1\left(M\right)\\C_{M_{CuCl_2}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\\\end{matrix}\right.\)
\(a,2NaOH+MgSO_4\rightarrow Mg\left(OH\right)_2+Na_2SO_4\\ n_{NaOH}=0,5.1=0,5\left(mol\right)\\ b,n_{Mg\left(OH\right)_2}=\dfrac{0,5}{2}=0,25\left(mol\right)=n_{Na_2SO_4}\\ m_{kt}=m_{Mg\left(OH\right)_2}=58.0,25=14,5\left(g\right)\\ c,V_{ddX}=V_{ddNaOH}+V_{ddMgSO_4}=0,5+0,5=1\left(l\right)\\ C_{MddNa_2SO_4}=\dfrac{0,25}{1}=0,25\left(M\right)\)
a.
\(Na_2CO_3+Ba\left(OH\right)_2\rightarrow BaCO_3+2NaOH\)
b.
\(n_{BaCO_3}=n_{Na_2CO_3}=0,2.1=0,2\left(mol\right)\\ m_{kt}=197.0,2=39,4\left(g\right)\)
c.
\(n_{Ba\left(OH\right)_2}=n_{Na_2CO_3}=0,2\left(mol\right)\\ C\%_{Ba\left(OH\right)_2}=\dfrac{0,2.171.100\%}{200}=17,1\%\)
a)
$BaCl_2 + H_2SO_4 \to BaSO_4 + 2HCl$
$n_{BaCl_2} = 0,1 < n_{H_2SO_4} = 0,2$ nên $H_2SO_4$ dư
$n_{BaSO_4} = n_{BaCl_2} = 0,1(mol)$
$m_{BaSO_4} = 0,1.233 = 23,3(gam)$
b)
A gồm :
$HCl : 0,1.2 = 0,2(mol)$
$H_2SO_4\ dư : 0,2 - 0,1 = 0,1(mol)$
$V_{dd} = 0,1 + 0,1= 0,2(lít)$
$C_{M_{HCl}} = \dfrac{0,2}{0,2} = 1M$
$C_{M_{H_2SO_4}} = \dfrac{0,1}{0,2} = 0,5M$
c)
$2NaOH + H_2SO_4 \to Na_2SO_4 + 2H_2O$
$n_{NaOH} = 2n_{H_2SO_4\ dư} = 0,2(mol)$
$m_{dd\ NaOH} = \dfrac{0,2.40}{15\%} = 53,33(gam)$
a)PTHH: \(Ba\left(OH\right)+Na_2CO_3\rightarrow2NaOH+BaCO_3\downarrow\)
\(BaCO_3\underrightarrow{t^o}BaO+CO_2\uparrow\)
Ta có: \(n_{Ba\left(OH\right)_2}=0,4\cdot0,2=0,08\left(mol\right)\)
\(\Rightarrow n_{NaOH}=0,16mol\) \(\Rightarrow C_{M_{NaOH}}=\dfrac{0,16}{0,4}=0,4\left(M\right)\) (Coi Vdd thay đổi không đáng kể)
b) Theo PTHH: \(n_{BaCO_3}=n_{Ba\left(OH\right)_2}=n_{BaO}=0,08mol\) \(\Rightarrow m_{BaO}=0,08\cdot153=12,24\left(g\right)\)
nBaCl2 = 2 . 0,2 = 0,4 mol
nNa2SO4 = 1. 0,3 = 0,3 mol
BaCl2 + Na2SO4 -> BaSO4v\(\downarrow\) + 2NaCl
0,4(dư);0,3(hết) --->0,3--------->0,3
mBaSO4 = 0,3 . 233=69,9 g
CM(NaCl) = \(\dfrac{0,3}{0,5}\) = 0,6 M
a) BaCl2 + Na2SO4 → 2NaCl + BaSO4↓
\(n_{BaCl_2}=0,2\times2=0,4\left(mol\right)\)
\(n_{Na_2SO_4}=0,3\times1=0,3\left(mol\right)\)
Theo PT: \(n_{BaCl_2}=n_{Na_2SO_4}\)
Theo bài: \(n_{BaCl_2}=\dfrac{4}{3}n_{Na_2SO_4}\)
Vì \(\dfrac{4}{3}>1\) ⇒ BaCl2 dư, Na2SO4 hết ⇒ Tính theo Na2SO4
b) Theo PT: \(n_{BaSO_4}=n_{Na_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow m_{BaSO_4}=0,3\times233=69,9\left(g\right)\)
c) \(\Sigma V_{dd}saupư=200+300=500\left(ml\right)=0,5\left(l\right)\)
Theo PT: \(n_{NaCl}=2n_{Na_2SO_4}=2\times0,3=0,6\left(mol\right)\)
\(\Rightarrow C_{M_{NaCl}}=\dfrac{0,6}{0,5}=1,2\left(M\right)\)
Theo PT: \(n_{BaCl_2}pư=n_{Na_2SO_4}=0,3\left(mol\right)\)
\(\Rightarrow n_{BaCl_2}dư=0,4-0,3=0,1\left(mol\right)\)
\(\Rightarrow C_{M_{BaCl_2}}dư=\dfrac{0,1}{0,5}=0,2\left(M\right)\)