Bài 4.15:
a) \(n_{H_2SO_4}=1.0,02=0,02\left(mol\right)\)
PTHH: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
0,04<-----0,02
=> mNaOH = 0,04.40 = 1,6 (g)
=> \(m_{dd.NaoH}=\dfrac{1,6.100}{20}=8\left(g\right)\)
b)
PTHH: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
0,04<-----0,02
=> mKOH = 0,04.56 = 2,24 (g)
=> \(m_{dd.KOH}=\dfrac{2,24.100}{5,6}=40\left(g\right)\)
=> \(V_{dd.KOH}=\dfrac{40}{1,045}=\dfrac{8000}{209}\left(ml\right)\)
Bài 4,16
a)
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,15<--0,3<-----0,15<--0,15
=> m = 0,15.56 = 8,4 (g)
b) \(C_{M\left(dd.HCl\right)}=\dfrac{0,3}{0,05}=6M\)
c)
\(C_{M\left(FeCl_2\right)}=\dfrac{0,15}{0,05}=3M\)