Question

The following two reactions are investigated in this experiment. Select the coefficients to obtain the correct balanced equations. Alka-Selzter Reaction NaHCO3(aq) + C6H8O7(aq) → CO2(g) + Na3C6H5O7(aq) + H2O(l) Unknown Antacid Reaction CaCO3(aq) + HCl(aq) → CO2(g) + CaCl2(aq) + H2O(l)

Answer 1

(1) The balanced chemical reaction will be,

`9NaHCO_3(aq)+2C_6H_8O_7(aq)\rightarrow 3CO_2(g)+5Na_3C_6H_5O_7(aq)+3H_2O(l)`

(2) The balanced chemical reaction will be,

`CaCO_3(aq)+2HCl(aq)\rightarrow CO_2(g)+CaCl_2(aq)+H_2O(l)`

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

Part 1 :

The unbalanced chemical reaction is,

`NaHCO_3(aq)+C_6H_8O_7(aq)\rightarrow CO_2(g)+Na_3C_6H_5O_7(aq)+H_2O(l)`

This reaction is an unbalanced chemical reaction because in this reaction number of atoms are not balanced on both the sides.

In order to balance the chemical equation, the coefficient '9' put before the
`NaHCO_3`, the coefficient '2' put before the
`C_6H_8O_7`, the coefficient '5' put before the
`Na_3C_6H_5O_7` and the coefficient '3' put before the
`CO_2\text{ and }H_2O` then we get the balanced chemical equation.

The balanced chemical reaction will be,

`9NaHCO_3(aq)+2C_6H_8O_7(aq)\rightarrow 3CO_2(g)+5Na_3C_6H_5O_7(aq)+3H_2O(l)`

Part 2 :

The unbalanced chemical reaction is,

`CaCO_3(aq)+HCl(aq)\rightarrow CO_2(g)+CaCl_2(aq)+H_2O(l)`

This reaction is an unbalanced chemical reaction because in this reaction number of hydrogen and chlorine atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the
`HCl` then we get the balanced chemical equation.

The balanced chemical reaction will be,

`CaCO_3(aq)+2HCl(aq)\rightarrow CO_2(g)+CaCl_2(aq)+H_2O(l)`