Răspuns:
a)
VsHCl= 400mL =0.4L
VCO2=1,12 L
n= 1,12 / 22,4 = 0,05moli CO2
1moli.....................................1mol
HCl + NaHCO3→ NaCl + CO2↑ + H2O
xmoli................................ 0,05moli
x= 0,05 x1/1 = 0,05 moli HCl
CM= n/Vs
CM = 0, 05 / 0,4 = 0,125 moli/ L
b)
2moli..........................................2moli
2NaCl + H2SO4→ Na2SO4 + 2HCl
ymoli........................................0,05moli
y=0,05 x 2 / 2=0,05moli NaCl
M NaCl= 23+35,5=58,5g/moli
n=m/M
m= n x M= 0,05×58,5= 2,925g NaCl
Explicație: