Câu 1:
a, $CuO$
$CuO+2HCl\to CuCl_2+H_2O$
b, $MgO, KOH, Zn$
$MgO+2HCl\to MgCl_2+H_2O$
$KOH+HCl\to KCl+H_2O$
$Zn+2HCl\to ZnCl_2+H_2$
c, $BaCl_2$
$BaCl_2+H_2SO_4\to BaSO_4+2HCl$
d, $Zn$
$Zn+2HCl\to ZnCl_2+H_2$
Câu 2:
a,
$Ca(OH)_2+2HNO_3\to Ca(NO_3)_2+2H_2O$ (Phản ứng trung hoà)
b,
$n_{Ca(OH)_2}=\dfrac{100.7,4\%}{74}=0,1(mol)$
$\to n_{HNO_3}=2n_{Ca(OH)_2}=0,2(mol)$
$\to C\%_{HNO_3}=\dfrac{0,2.63.100}{300}=4,2\%$
c,
$m_{\text{dd spu}}=300+100=400g$
$n_{Ca(NO_3)_2}=0,1(mol)$
$\to C\%_{Ca(NO_3)_2}=\dfrac{0,1.164.100}{400}=4,1\%$
d,
$Ca(OH)_2+H_2SO_4\to CaSO_4+2H_2O$
$\to n_{H_2SO_4}=0,1(mol)$
$\to m_{dd H_2SO_4}=0,1.98:10\%=98g$
