Name Section Experiment 7: Synthesis of Strontium Oxalate DATA AND OBSERVATIONS
ID: 229619 • Letter: N
Question
Name Section Experiment 7: Synthesis of Strontium Oxalate DATA AND OBSERVATIONS 1. Mass of Sr(NOs)2 2. Moles of Sr(NOs)2 3. Moles of (NH4)2C:0 Which is smaller line 2 or 3? Which is your limiting reactant? 4. Mass of filter paper+SrC O 5. Mass of filter paper 6. Mass of SrC204 (actual yield) 7· Theoretical moles of Src,04 8. Theoretical mass of SrC204 (theoretical yield) 9. Percent yield of SrC 0 Post Lab Questions 1. What should be done if particles of the precipitate appear in the filtrate? 2. What could cause your percent yield of strontium oxalate to be a. above 100%? Explain your answer. b, below 100%? Explain your answer.Explanation / Answer
Answer
1) First confirm whether the precipitate is required to recycle or not with the instructor. If yes, filter the filtrate again and collect the precipitate. Later precipitate will be compared with the reactants which are used in the reaction and products formed in the reaction.
2)
a) The ideal or theoretical yield of the reaction is 100%. The possibilities for more than 100% yield are
(i) More quantity of the reactants may be used (error in the measurement of reactants)
(ii) Presence of impurities or unreacted chemicals due to inadequate purification.
(iii) Product may not be dried properly (product still contains solvent)
b) The actual yield is very often smaller the reasons are
(i) The reaction may be incomplete and the reactants are not completely converted to products.
(ii) May be reactants are converted to undesired by-products
(iii) Quantity may be lost in the seperation and purification of the desired product from the reaction mixture.
(iv) Unreacted impurities may be present in the reaction.
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