Answer
a) 0.18 M in CO₃²−
e) 0.36 M in Na⁺
Work Step by Step
Na₂CO₃ is a completely ionized salt, so 1mol of sodium carbonate dissociate in water to give 2mol of Na⁺ ions and 1mol of CO₃²⁻ ions, so:
Na₂CO₃ (aq) → 2Na⁺ (aq) + CO₃²⁻ (aq)
0.18 M 0.36 M 0.18 M
