Write net equations for each of the combinations of reactants below. Use appropriate ionic and molec — Descriptive Chemistry Chemistry Question
Problem Context
Write net equations for each of the combinations of reactants below. Use appropriate ionic and molecular formulas and omit formulas for all ions or molecules that do not take part in a reaction. Write structural formulas for all organic substances. You need not balance the equations. All reactions occur in aqueous solution unless otherwise indicated.
Solid sodium sulfide is added to water.
Model Answer
Na2S + H2O → 2Na+ + HS– + OH–
An aqueous solution of potassium triiodide is added to a solution of sodium thiosulfate.
Model Answer
I3– + S2O32– → 3I– + S4O62–
Excess aqueous sodium fluoride is added to aqueous iron(III) nitrate.
Model Answer
F– + Fe3+ → FeF63–
Strontium-90 undergoes beta decay.
Model Answer
90 38Sr → 90 39Y + -1 0β
Excess carbon dioxide is bubbled through a solution of calcium hydroxide.
Model Answer
CO2 + Ca(OH)2 → Ca2+ + HCO3–
Ethanol is warmed gently with acidified potassium dichromate.
Model Answer
CH3CH2OH + Cr2O72– + H+ → CH3CH=O (or CH3COOH) + Cr3+ + H2O