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Precipitate Lab

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Introduction

Precipitate Lab Lauren Kelly Partner: Shanice Sproule Mr. Chase IB Chemistry Sr(Cl)2 + CuSO4 --> SrSO4 + Cu(Cl)2 Method 1. Obtain the materials needed to perform this experiment. 2. Place the funnel holder on the retort stand and place the funnel in one of the slots 3. Place the folded funnel paper into the funnel. (First weigh the filter paper) 4. Mix the three agents in one of the beakers until the crystals of the Strontium Chloride turns into fluffy clumps 5. Pour the contents of the beaker into the filter carefully. If needed, use the stir stick to direct the liquid. Use De-Ionized water to rinse the remainder of the precipitate from the beaker into the filter. ...read more.

Middle

m Sr (Cl)2= 2.015 g M Sr (Cl)2= 158.526 g/mol m CuCl2=2.035 g M CuCl2= 159.611 g/mol n Sr(Cl)2= 2.015 g / 158.526 g/mol =0.0127108 mol =0.0127 mol n CuCl2= 2.035 g / 159.611 g/mol =0.0127497 mol =0.0128 mol Mole ratio is 1:1 for this reaction, there was 0.0127123 moles of Strontium Chloride, you would need 0.0127 moles of Copper (II) Sulphate, but since there was0.0127498 moles of the Copper, (slightly more than the number of Strontium Chloride) means the Strontium Chloride is the limiting factor in this reaction. Seeing as the Strontium Chloride is the limiting factor for this reaction: n Sr(Cl)2= 0.0128 mol (1:1) M SrSO4= 183.685 g/mol m= 0.0128 mol x 183.685 g/mol = 2.335058826 g SrSO4 produced =2 g SrSO4 produced The amount of precipitate had left in our experiment was 0.522 g, which was quite far away form the theoretical mass of 2.335 g. ...read more.

Conclusion

Perhaps put someone in charge of ensuring that no agents are ever re-added after being used or contaminated to ensure the purest agents possible. Human error in measuring, not zeroing the balance, not being precise with water measurements etc Human error results in data that is inaccurate in many different areas of the experiment. Doing multiple trials to ensure accuracy, and also perhaps having a partner double check each step before proceeding with the experiment. Possibility of impure air effecting experiment Making mass larger because of other agents acting in the experiment Performing the experiment in a ventilated room, or with the use of a fume hood. Didn't heat the beaker at the beginning Excess moisture present in experiment Heat beaker at the beginning next time ?? ?? ?? ?? 2 ...read more.

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