Notes: Limiting & Excess

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Notes: Limiting & Excess WCHS Chemistry

NaHCO3 (s) + HC2H3O2 (aq) → H2CO3 (aq) + NaC2H3O2 (aq) H2O (l) + CO2 (g) https://www.youtube.com/watch?v=Ot93gQONqk0

LIMITING & EXCESS STOICH RULES Rule #1: The limiting reactant controls your stoichiometry. Limiting reactant = the one that you run out of first Excess reactant = the one that is left over Limiting Frame + Wheels → Bike! 1 2 1 10 10 5 0.42 moles 0.84 moles 0.42 moles

LIMITING & EXCESS STOICH RULES Frame + Wheels → Bike! 1 2 1 10 16 8 0.42 moles 0.62 moles 0.31 moles Be careful! Just because it’s the smallest number Doesn’t mean it’s always limiting!

LIMITING & EXCESS STOICH RULES Rule #2: CHECK THE RATIO ! Just because there is MORE of something doesn’t mean it is EXCESS! Limiting & excess isn’t about which has more or less --- It’s about the ratio!

If you have 0. 30 moles of Ag(NO3)2 and 0 If you have 0.30 moles of Ag(NO3)2 and 0.50 moles of KCl, which is the limiting reactant? Which is excess? Limiting! Ag(NO3)2 + KCl → AgCl2 + KNO3 2 2 0.30 moles 0.50 moles 1:2 ratio Need 0.60 KCl, but have less Steps: Balance: the coefficients tell you the ratio of moles! Convert ALL given info into MOLES Check your ratio, then label limiting reactant = the one that does not satisfy the RATIO