Barium oxalate is used as a colorant to produce the green color in fireworks. Im

Question

Barium oxalate is used as a colorant to produce the green color in fireworks. Imagine that you have been assigned to prepare barium oxalate by reacting barium hydroxide octahydrate (Ba(OH)2·8H2O) with oxalic acid dihydrate (H2C2O4·2H2O). Find the number of grams of oxalic acid dihydrate that would be required to completely react with 5.3 g of barium hydroxide octahydrate. Use correct significant figures. Do not include a unit with your answer or it will be counted wrong.

Explanation / Answer

Answer – We are given, mass of Ba(OH)2·8H2O = 5.3 g

Reaction - Ba(OH)2·8H2O + H2C2O4·2H2O ----> BaC2O4 + 12 H2O

Now we need to calculate the moles of Ba(OH)2·8H2O

Moles of Ba(OH)2·8H2O = 5.3 g / 315.46 g.mol-1

                                          = 0.0168 moles

From the balanced reaction

1 mole of Ba(OH)2·8H2O = 1 moles of H2C2O4·2H2O

So, 0.0168 moles of Ba(OH)2·8H2O = ?

= 0.0168 moles of H2C2O4·2H2O

Mass of H2C2O4·2H2O = 0.0168 moles * 126.07 g/mol

                                      = 2.1 g

2.1 grams of oxalic acid dihydrate that would be required to completely react with 5.3 g of barium hydroxide octahydrate

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