Answer:
+1
Explanation:
Let's consider the following equation.
NaHCO₃ + HCl ⇒ NaCl + CO₂ + H₂O
To determine the oxidation number of Na in NaHCO₃ we will use the following rule: the sum of the oxidation number of the elements present in a compound is equal to this charge. For this compound we know:
- The oxidation number of H is +1.
- The oxidation number of C is +4.
- The oxidation number of O is -2.
- The charge of the compound is zero (neutral compound)
Na + H + C + 3 O = 0
Na + (+1) + (+4) + 3 (-2) = 0
Na = +1
