a, Ta co pthh
SO2 + H2O \(\rightarrow\) H2SO3
b, Dung dich tao thanh ( H2SO3) lam quy tim hoa do
c, Theo de bai ta co
nSO2 =\(\dfrac{12,8}{64}=0,2mol\)
VH2O=400ml=0,4 l
Theo pthh
nH3PO4=nSO2=0,2 mol
\(\Rightarrow\) Nong do mol cua dd thu duoc la
CM=\(\dfrac{n}{V}=\dfrac{0,2}{0,4}=0,5M\)
d, Ta co pthh
H2SO3 + Zn \(\rightarrow\) ZnSO3 + H2
Theo de bai ta co
nZn=\(\dfrac{9,75}{65}=0,15mol\)
Theo pthh
nH2SO3=\(\dfrac{0,2}{1}mol>nZn=\dfrac{0,15}{1}mol\)
\(\Rightarrow\) So mol cua H2SO3 du (tinh theo so mol cua Zn )
Theo pthh
nH2=nZn=0,15 mol
\(\Rightarrow\) The tich H2 thu duoc la
VH2=0,15.22,4=3,36 l