The answer is 10 mol
Ferric Chloride, also known as Iron (III) Chloride (FeCl3), is a flocculant used in treating wastewater and drinking water manufacturing. Iron(III) hydroxide precipitates and adsorbs finely split particles and colloids when modest amounts of ferric chloride are introduced to raw water.
Both are tiny, with an effective ionic radius of 54 pm for A13+ and 65 pm for Fe3+ in six-fold coordination [2,3]. Both metal ions are hydrolyzed extensively and precipitated as hydroxides, greatly limiting the quantity of soluble aqueous species in neutral solutions.
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