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When acid is added:
Molecular: NaCHO2(aq) + H+(aq) => HCHO2(aq) + Na+(aq)
Ionic: CHO2-(aq) + H+(aq) => HCHO2(aq)
When base is added:
Molecular: HCHO2(aq) + NaOH(aq) => NaCHO2(aq) + H2O(l)
Ionic: HCHO2(aq) + OH-(aq) => CHO2-(aq) + H2O(l)
Solution
When acid is added:
Molecular: NaCHO2(aq) + H+(aq) => HCHO2(aq) + Na+(aq)
Ionic: CHO2-(aq) + H+(aq) => HCHO2(aq)
When base is added:
Molecular: HCHO2(aq) + NaOH(aq) => NaCHO2(aq) + H2O(l)
Ionic: HCHO2(aq) + OH-(aq) => CHO2-(aq) + H2O(l)

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