PLEASE GET OUT YOUR GREEN PACKET & RUBRIC & HW SHEET & HIGHLIGHTER Work Day! Quest Day!

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Stoichiometric Calculations

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Presentation transcript:

PLEASE GET OUT YOUR GREEN PACKET & RUBRIC & HW SHEET & HIGHLIGHTER Work Day! Quest Day!

LIMITING REACTANTS AND PERCENT YIELD Ex: Sodium sulfate and water are created when 50 g of NaOH and 75 g of H 2 SO 4 are mixed. Calculate the percent yield if only 25 g of sodium sulfate are made. Steps: 1.Write and balance equation 2.Calculate how much Na 2 SO 4 can be made with 50 g NaOH 3.Calculate how much Na 2 SO 4 can be made with 75 g of H 2 SO 4 The lower # from 2 and 3 is how much Na 2 SO 4 you can make! 1.Percent yield = actual yield (25g)/theoretical yield (answer above) x 100 How much did I actually get/How much should I have gotten?

ANSWERS 1.H 2 SO 4 (aq) + 2NaOH (aq)  Na 2 SO 4 (aq) + 2H 2 O (l) 2.(50g/40.00/2*140.15)=  90 g of Na 2 SO 4 3.(75/98.09*140.15)=  110 g of Na 2 SO 4 NaOH is the limiting reagent so I can only make 90 grams of Na 2 SO g / 90 g = …  30 % yield

DISCUSSION Do you think that you will have more or less copper than you started with? Why could a group have less copper? Why could a group have “more copper”?

HW REVIEW Review the homework with your lab group. We will check answers as a class in a bit. Log on homework sheet and total “Unit 6 homework” Out of 40 points & highlight

WORK DAY! 1.Please retrieve your copper from the hood 2.Weigh your copper and filter paper in the back 3.Calculate the weight of your copper (subtract off your filter paper) 4.Tell the teacher your final mass 5.They will tell you your initial mass 6.Continue working on your PowerPoint! Homework:  Finish PowerPoint  Finish green packet

WORK TIME! Work on your PowerPoint as a group Finish your green packet Last 30 minutes for Quest! Homework:  Finish powerpoint  Finish green packet

STOICHIOMETRY QUEST Exit Task: (when finished with your Quest) On a piece of paper WITHOUT your name. (or with your name… who cares!) What words of advice do you have for next year’s students doing the copper lab? Homework:  Finish PowerPoint  Finish green packet