Hydroiodic acid was neutralized with potassium hydrogen carbonate. The resulting salt was reacted with a solution containing potassium dichromate and sulfuric acid. When the formed simple substance interacted with aluminum, a salt was obtained. This salt was dissolved in water and mixed with potassium sulfide solution, resulting in a precipitate and gas evolution. Write the equations for the four reactions described.
HI + KHCO3 = KI + CO2 + H2O
6KI + K2Cr2O7 + 7H2SO4 = 3I2 + Cr2(SO4)3 + 4K2SO4 + 7H2O
2Al + 3I2 = 2AlI3
2AlI3 + 3K2S + 6H2O = 2Al(OH)3↓ + 3H2S↑ + 6KI
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