Lab I4 - Mikalah Millheim Lab Partner Ashlin Chavez EXP I1 April 6 2016 Concentration of stock Ca(NO3)2(aq.1000 M Concentration of stock KIO3(aq.01001 M

# Lab I4 - Mikalah Millheim Lab Partner Ashlin Chavez EXP I1...

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Mikalah Millheim Lab Partner: Ashlin Chavez EXP. I1 April 6, 2016 Concentration of stock Ca(NO 3 ) 2 (aq): .1000 M Concentration of stock KIO 3 (aq): .01001 M Solution One Solution Two mL Ca(NO 3 ) 2 solution 25 10 mL KIO 3 solution 25 25 Mass of filter paper (grams) .8942 .8902 Mass of filter paper+ppt .8952 .8934 Mass of ppt .0010 .0032 Moles Ca(NO 3 ) 2 .0025 .001 Moles KIO 3 2.5x10 -4 2.5x10 -4 Expected mass ppt .0487 .0487 25 mL Ca(NO 3 ) 2 x .1000 moles = .0025 moles 1 1000 mL 25 mL KIO 3 x .01001 moles = 2.5x10 -4 moles 1 1000 mL Given: Ca(NO 3 ) 2 (aq) + 2KIO 3 (aq) → Ca(IO 3 ) 2 (s) + 2KNO 3 (aq) .0025 mol Ca(NO 3 ) 2 x 1 mole Ca(IO 3 ) 2 x 389.89 grams = .975 grams Ca(IO 3 ) 2 1 1 mole Ca(NO 3 ) 2 1 mole Ca(IO 3 ) 2 Limiting Reactant : 2.05x10 -4 mol KIO 3 x 1 mole Ca(IO 3 ) 2 x 389.89 grams = .0487 grams Ca(IO 3 ) 2 1 2 mole KIO 3 1 mole Ca(IO 3 ) 2 Results from III:
Presence of Ca 2+ Presence of IO 3 - Supernatant from sol’n 1 Positive Positive Supernatant from sol’n 2 Positive Positive Results from IV: When Ca(NO 3 ) 2 (aq) was added dropwise to KIO 3 (aq), the mixture slowly became more cloudy and exhibited the same characteristics as the mixture created in part IA.

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