Determine Limiting Reagen Experiment Essay

1282 Words Mar 4th, 2013 6 Pages
Investigation 3
Determine the Limiting Reagent

Chemistry
Investigation 3 Limiting Reagents

Aim: To determine the limiting reagent in a reaction.

Hypothesis: if the number of moles of the solutions added together equals the stoichiometry ratio in the balanced equation, then we would not expect a limiting reagent in the reaction.

Independent variable: The number of moles of the reactants
Dependent Variable: The limiting reagent
Constant Variable: The volume of reactants added

Equipment: 2 100 ml beaker 2 measuring cylinders 10 ml of 0.1 molL-1 HCL(aq), NAOH(aq) 20 ml of 0.1 molL-1H2SO4(aq), CuSO4(aq) 30 ml of 0.1 molL-1 Ba(NO3)2(aq) Universal indicator Filter Paper Funnel 4 test tubes

Reaction
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This excess CuSO4 results in the precipitation of BaSO4 when combined with Ba(NO3)2.

Hence in this reaction, Ba(NO3)2 is the limiting reagent.

Safety Issues:

Nitric acid is an irritant and direct eye contact causes severe burns and may even result to permanent eye damage. Direct skin contact, on the other hand, causes pain, redness, and serious skin burns.
NaOH: burns eyes, caustic, destroys skin cells.
Safety glasses are strongly recommended to be worn.

Conclusion: In conclusion, based on the results shown above, HCl, Ba(NO3)2 and Ba(NO3)2 are the limiting reagents for the three reactions respectively. This shows that the hypothesis is not supported There will be limiting reagent even though the number of moles of the solutions added together equals the stoichiometry ratio in the balanced equation. This means that the original concentration is not accurate. Due to human errors such as not using a pipette to measure the solution contributes to the results we have obtained.

Evaluation:

Second Hand Data

Group 1 Results: Lipakshi, Kat and Krista

| Limiting Reagent | Reaction A | Once the solution of NaOH and HCL was mixed and the indicator was added, the solution turned purple, thus indicating solution was basic and that NaOH was in excess. | Reaction B | Barium

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