Barium carbonate is the source of barium compounds.  It is produced in an aqueous precipitation reaction from barium sulfide and sodium carbonate.  (Barium sulfide is a soluble compound obtained by heating the mineral barite, which is barium sulfate, with carbon.)  What are the molecular equation and net ionic equation for the precipitation reaction?  A solution containing 33.9 g barium sulfide requires 21.2 g of sodium carbonate to react completely with it, and 15.6 g of sodium sulfide is produced in addition to whatever barium carbonate is obtained.  How many grams of barium sulfide are required to produce 500 tons of barium carbonate?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.