Recent content by orchidee7

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    Calc % Ag in Alloy: 0.6353g Ag2/ 0.5000g alloy x 100% = 12.9%

    Homework Statement An alloy of copper and silver weighing 0.5000 grams is dissolved in HNO3 and treated with H2S to precipitate both CuS and Ag2S. It is found that the solid sulphides weigh 0.7300 grams. Calculate the percentage of Ag in the alloy. (12.9 %) 2Ag+(aq) + H2S(aq)→ Ag2S(s) +...
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    Calculating Percent Yield of PbI2 in 2CsI + Pb(NO3)2 Reaction

    I didn't even think of that… I would multiply the percent purity by the mass rather than dividing. 22.9841 g Pb(NO3)2 x 0.7525 = 17.2955 g Pb(NO3)2 and 51.2354 g CsI x 0.8121 = 41.6082 g CsI Thank you so much!
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    Calculating Percent Yield of PbI2 in 2CsI + Pb(NO3)2 Reaction

    I just assumed it was necessary as the question had given the molar mass for the pure compounds…
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    Calculating Percent Yield of PbI2 in 2CsI + Pb(NO3)2 Reaction

    Sorry, it is the mass divided by the purity percentage of the compound 22.9841 g Pb(NO3)2 / 75.25% = 0.3054 g Pb(NO3)2
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    Calculating Percent Yield of PbI2 in 2CsI + Pb(NO3)2 Reaction

    Homework Statement In one experiment, 22.9841 grams of 75.25% pure Pb(NO3)2 (pure Pb(NO3)2 has a molar mass of 331.2 grams) was mixed with 51.2354 grams of 81.21% pure CsI (pure CsI has a molar mass of 259.80992 grams): 2CsI(aq) + Pb(NO3)2(aq) → 2CsNO3(aq) + PbI2(s) After the reaction...
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    Solve Backtitration Problem: Find mL of NaOH Used

    I'm stuck on how to find how many ml of NaOH were used in a back titration. A 0.6000 g sample of K2CO3 (138.2055 g/mol) is dissolved in enough water to make 200.0 mL of solution A. A 20.00 mL aliquot of solution A is taken and put into an Erlenmeyer flask. To the flask is added 20.00 mL of...
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