8/10/2019 CSL_Worksheet 4.8.doc

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8/10/2019 CSL_Worksheet 4.8.doc

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Worksheet 4.8

Excess reagent stoichiometry

No. Question Answer

dissolved in (2) cm#of ).44& mol dm+#potassium bromate 5rO#! solution

according to the equation:

,7r2O#s! " 65rO#aq! " &5O$aq!

,527r2O4aq! " 2$2Ol! " #r2aq!

/etermine which reagent is in excess and

thus calculate the mass of bromine

formed in the reaction.

5 &,., cm#of ).*60 mol dm+#tin''!chloride solution is added to ,0.2 cm#of

(.22# mol dm+#ammonium hydroxide

solution to generate a precipitate of tin''!

hydroxide.

a 3rite an equation- including states-

for this precipitation reaction.

b 3hat mass of precipitate is

produced

6 One of the ma8or commercial uses ofsulfuric acid is in the production of

phosphoric acid and calcium sulfate. The

calcium sulfate is used as a component in

fertili9ers. The equation for this reaction

is:

7a#O&!2s! " #$2%O&aq!

#7a%O&s! " 2$#O&aq!

/etermine the masses of both reactants

calcium phosphate and sulfuric acid! that

would be required to produce ()) ;g ofcalcium sulfate- assuming the process is

only 4,< efficient.

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Pearson Education Australia (a division of Pearson Australia Group Pty Ltd) 2008.This pae fro! the Chemistry"For use with the IB Diploma Programme SL Teachers Resource !ay #e reproduced for classroo! use.