Question

When 4.2g of sodium hydrogen carbonate (NaHCO3) is added to a solution of HCl weighing 10.0g, it is observed that 2.2g of CO2 is released into the atmosphere. The residue left behind is found to weigh 12.0g. Show that these observations are in agreement with the laws of conservation of mass.

Answer 1

Weight of $NaHC{O}_3=4.2g$

Weight of $HCl=10g$

Weight of $C{O}_2=2.2g$

Weight of residue $=12g$

According to law of conservation of mass

$NaHC{O}_3+HCl=C{O}_2+\text{residue}$

$4.2+10=2.2+12$

$14.2=14.2$

Since the masses are same before and after the reaction, thus results agree with the law of conservation of mass.

Hence proved.