Limiting Reactant Calc & H2 Gas Prod per Flask

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SUMMARY

This discussion focuses on calculating the limiting reactant in the reaction between magnesium (Mg) and hydrochloric acid (HCl) to produce hydrogen gas (H2) and magnesium chloride (MgCl2). The procedure involves adding 25 mL of HCl solution to flasks containing varying weights of Mg ribbon (0.15g, 0.3g, and 0.6g). Participants are guided to convert the weight of Mg and HCl to moles, identifying the limiting reactant as the one that produces the least amount of hydrogen gas, following the stoichiometric relationship defined by the equation Mg + 2HCl → H2 + MgCl2.

PREREQUISITES
  • Understanding of stoichiometry in chemical reactions
  • Knowledge of molar conversions and calculations
  • Familiarity with the reaction between magnesium and hydrochloric acid
  • Basic laboratory skills for conducting chemical experiments
NEXT STEPS
  • Learn how to perform stoichiometric calculations in chemical reactions
  • Study the concept of limiting reactants in various chemical equations
  • Explore the production and measurement of hydrogen gas in laboratory settings
  • Investigate the effects of varying concentrations of reactants on reaction yield
USEFUL FOR

Chemistry students, laboratory technicians, and educators looking to enhance their understanding of chemical reactions, particularly in determining limiting reactants and gas production in experiments.

yjk91
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Procedure
1. Add 25 mL of HCL solution to each flask.
2. Weigh out 0.15g, 0.3g, and 0.6g of Mg ribbon and place each sample into its own balloon
1.0moles HCL/1L or 0.1 moles HCL/100mL solution

Mg + 2HCl --> H2 + MgCl2show the calculations determining the limiting reactant for each reaction.
0.15g
0.3g
0.6g

Help on how to get the limiting reactant!

And using the limiting reactant as the starting amount, determine the amount of hydrogen gas that was produced per reaction flask:
 
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Convert the weight of each reagent to mols, whichever gives the least number of mols is your limiting reagent (don't forget to divide by 2 where appropriate to represent 2 atoms/molecules being required).
 

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