Is aluminum sulfite a base?The formula is Al2(SO3)3 and can you give me some other examples of bases?

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docmartin | High School Teacher | (Level 1) eNoter

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Aluminum sulfite is a base. It's conjugate acid, sulfurous acid, is a weak acid. This makes it a relatively strong base. Note that conjugates are always opposites this way: if a base is weak, it's conjugate acid is strong, and vice versa. It is only when a base us extremely weak (and is therefore the conjugate of a very strong acid) that we say that it is not a base and is only a salt. While the strongest bases have hydroxide groups, there are a lot of bases that do not contain hydroxide. Examples include: NH3 -- Ammonia NaCH3CO2 -- Sodium acetate KNO2 -- Potassium nitite
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kait-mu | Student, Grade 10 | (Level 1) eNoter

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yes, Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hrdreted potassium aluminiumsulfate (potassium alun) with the formula KAL(SO4)2.12H2O). The wider class of compounds known as alums have the related empirical formula,AB(SO4)2.12H2O.

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amin196 | Student, Undergraduate | (Level 1) eNoter

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Aluminum sulfite is neither an acid or base, it's a salt. However, when combined with water or another substance, the entire solution can become either become an acid or a base depending on the direction of equilibrium (kPa). 

Here are some examples of bases and their respective formulas:

Calcium Hydroxide - Ca(OH)2

Sodium Hydroxide - NaOH

Potassium Hydroxide - KOH

Barium Hydroxide - Ba(OH)2

Notice how all of these bases have an Hydroxide Ion (OH-), this is often a general indicator that a substance is a base. However, this heuristic should only be used for common substances and is not true for all compounds containing OH (especially complex substances).


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