The reaction is double displacement and the salt produced is sodium sulfate.
<h2>
Answer: A (+4)</h2>
Explanation:
The HCO₃ in NaHCO₃ has an oxidation state of -1. We know this because of the charge on HCO₃ and also by the fact that Na is a group 1 metal that always has a +1 oxidation state.
The sum of the oxidation states of the components of HCO₃ has to be equal to -1
⇒ H + C + 3 O = - 1
A rule of redox is that Oxygen always has a - 2 oxidation state and H usually has a + 1 oxidation state
⇒ 1 + C + 3(-2) = - 1 <em>[make C the subject of the equation and simplify]</em>
⇒ C = -1 - 1 + 6
C = + 4
<h2>
Answer: 4.94 g </h2>
Explanation:
Mass of solution of Na₃PO₄ = volume × density
= 35.9 mL × 1.10 g/mL
= 39.49 g
Now, since the solution only contains 12.5% Na₃PO₄, then the mass of Na₃PO₄ is 12.5% of 39.49 g
12.5% × 39.49 g = <u>4.94 g </u>
