Aqueous aluminum sulfate is mixed with aqueous ammonium hydroxide

Al2(SO4)3 + 6(NH3•H2O) → 2Al(OH)3 + 3(NH4)2SO

Explanation:

Aluminium sulfate react with ammonium hydroxide to produce aluminium hydroxide and ammonium sulfate.

If you are looking for the equation

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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the correct answer is:

a. formation of precipitation