Question

Напишіть молекулярні, повні та скорочені йонно-молекулярні рівняння між попарно взятими речовинами за поданими формулами. Що спостерігається під час реакції? a)Na2SO3, HNO3 b)CrCl 3 , KOH

Answer 1

Відповідь:

a)В ходе реакции образуется газ SO2, который можно наблюдать в виде пузырьков, выходящих из раствора.

b)В ходе реакции образуется осадок гидроксида хрома(III) K3[Cr(OH)6], который можно наблюдать в виде твердых частиц, выпадающих из раствора.

Answer 2

Molecular Equations:

a) Sodium sulfite (Na2SO3) + Nitric acid (HNO3) - Molecular equation: Na2SO3 + 2HNO3 → Na2SO4 + 2NO2 + H2O [[1]] - During the reaction, sodium sulfite reacts with nitric acid to form sodium sulfate, nitrogen dioxide, and water.

b) Chromium(III) chloride (CrCl3) + Potassium hydroxide (KOH) - Molecular equation: CrCl3 + 3KOH → Cr(OH)3 + 3KCl [[2]] - During the reaction, chromium(III) chloride reacts with potassium hydroxide to form chromium(III) hydroxide and potassium chloride.

Complete Ionic Equations:

a) Sodium sulfite (Na2SO3) + Nitric acid (HNO3) - Complete ionic equation: 2Na^+ + SO3^2- + 2H^+ + 2NO3^- → 2Na^+ + SO4^2- + 2NO2 + H2O [[1]] - During the reaction, the sodium ions (Na^+) and nitrate ions (NO3^-) remain unchanged, while the sulfite ions (SO3^2-) react with the hydrogen ions (H^+) to form sulfate ions (SO4^2-), nitrogen dioxide (NO2), and water.

b) Chromium(III) chloride (CrCl3) + Potassium hydroxide (KOH) - Complete ionic equation: Cr^3+ + 3Cl^- + 3K^+ + 3OH^- → Cr(OH)3 + 3K^+ + 3Cl^- [[2]] - During the reaction, the chromium(III) ions (Cr^3+) and chloride ions (Cl^-) remain unchanged, while the potassium ions (K^+) and hydroxide ions (OH^-) react to form chromium(III) hydroxide and potassium chloride.

Net Ionic Equations:

a) Sodium sulfite (Na2SO3) + Nitric acid (HNO3) - Net ionic equation: SO3^2- + 2H^+ → SO4^2- + H2O [[1]] - During the reaction, the sodium ions (Na^+), nitrate ions (NO3^-), and sodium sulfate (Na2SO4) are spectator ions and do not participate in the reaction. The net ionic equation focuses on the reaction between the sulfite ions (SO3^2-) and the hydrogen ions (H^+) to form sulfate ions (SO4^2-) and water.

b) Chromium(III) chloride (CrCl3) + Potassium hydroxide (KOH) - Net ionic equation: Cr^3+ + 3OH^- → Cr(OH)3 [[2]] - During the reaction, the chloride ions (Cl^-), potassium ions (K^+), and potassium chloride (KCl) are spectator ions and do not participate in the reaction. The net ionic equation focuses on the reaction between the chromium(III) ions (Cr^3+) and the hydroxide ions (OH^-) to form chromium(III) hydroxide.

Please note that the provided equations are simplified representations of the reactions and may not include all possible reaction products or conditions.