Conversation Transcript   Boss:  Please sit down, Employee X.  I understand that you have been preparing our gold(III) hydroxide.  Is that correct? Employee X: Yes, Sir.  Is there a problem with the product? Boss: No, the product is fine but our supply of gold(III) chloride has run very low. Employee X: (nervously) Maybe that’s because I’m working so hard? Boss: (seriously) Perhaps.  Please describe how you are making the gold(III) hydroxide. Employee X: I mix the sodium hydroxide with the gold(III) chloride solution and our catalyst, then let it settle for about an hour and remove the clear liquid from the top.  Then I centrifuge (spin) the sludge.  I remove the rest of the liquid and finally, I let the material dry in the oven overnight. Boss: That’s not a very precise description.  How much gold(III) chloride and how much sodium hydroxide do you mix? Employee X: The first time I used 280 g of gold(III) chloride and 12 g of sodium hydroxide. Boss: Why did you use those amounts? Employee X: Those were the numbers I remember from my first day of work. But I only got about 24 g of gold(III)hydroxide. I was told the yield was too low and that I should get more than 200 g of product. So, I increased the amount of all reactants by 10 times. Boss: (in a surprised voice) Everything? Employee X: (nervously)Yes. Boss: Do you have a copy of the laboratory notebook for the reaction specification from your first day at work? Employee X: (sheepishly) No, I don't. It was easy to remember, so I didn't write it down. Boss: (frowning) You must write down detailed notes on all reactions. Boss: So you mixed 2800 g of gold(III) chloride and 120 g of sodium hydroxide? Employee X: That’s right, (pleased with himself) and I got about 248 g of gold(III) hydroxide, which is significantly higher than 200 g! Boss: And what happened to the liquid portion of each reaction? Employee X: I dumped it down the drain,  since I had already isolated the product. Boss: (heavy sigh) How many batches of product have you made with this second combination? Employee X: Five batches a week for a month. Boss: As you know gold is very expensive - about $77 per gram. And you made 20 batches?!   Boss: (seriously) This meeting is over. I have a suspicion that something is not right, but I don’t have the time to figure it out. I have hired ChemDetective to investigate this matter. We will resume production only after we have their report. You may take the next 2 days as casual leave. Someone will get in touch with you after we have seen the report from ChemDetective.   The question is " What is the maximum mass of gold(III) hydroxide that can be made from the amounts that Employee X mixed in the second reaction? "

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Conversation Transcript

 

Boss:  Please sit down, Employee X.  I understand that you have been preparing our gold(III) hydroxide.  Is that correct?

Employee X: Yes, Sir.  Is there a problem with the product?

Boss: No, the product is fine but our supply of gold(III) chloride has run very low.

Employee X: (nervously) Maybe that’s because I’m working so hard?

Boss: (seriously) Perhaps.  Please describe how you are making the gold(III) hydroxide.

Employee X: I mix the sodium hydroxide with the gold(III) chloride solution and our catalyst, then let it settle for about an hour and remove the clear liquid from the top.  Then I centrifuge (spin) the sludge.  I remove the rest of the liquid and finally, I let the material dry in the oven overnight.

Boss: That’s not a very precise description.  How much gold(III) chloride and how much sodium hydroxide do you mix?

Employee X: The first time I used 280 g of gold(III) chloride and 12 g of sodium hydroxide.

Boss: Why did you use those amounts?

Employee X: Those were the numbers I remember from my first day of work. But I only got about 24 g of gold(III)hydroxide. I was told the yield was too low and that I should get more than 200 g of product. So, I increased the amount of all reactants by 10 times.

Boss: (in a surprised voice) Everything?

Employee X: (nervously)Yes.

Boss: Do you have a copy of the laboratory notebook for the reaction specification from your first day at work?

Employee X: (sheepishly) No, I don't. It was easy to remember, so I didn't write it down.

Boss: (frowning) You must write down detailed notes on all reactions.

Boss: So you mixed 2800 g of gold(III) chloride and 120 g of sodium hydroxide?

Employee X: That’s right, (pleased with himself) and I got about 248 g of gold(III) hydroxide, which is significantly higher than 200 g!

Boss: And what happened to the liquid portion of each reaction?

Employee X: I dumped it down the drain,  since I had already isolated the product.

Boss: (heavy sigh) How many batches of product have you made with this second combination?

Employee X: Five batches a week for a month.

Boss: As you know gold is very expensive - about $77 per gram. And you made 20 batches?!

 

Boss: (seriously) This meeting is over. I have a suspicion that something is not right, but I don’t have the time to figure it out. I have hired ChemDetective to investigate this matter. We will resume production only after we have their report. You may take the next 2 days as casual leave. Someone will get in touch with you after we have seen the report from ChemDetective.

 

The question is "

What is the maximum mass of gold(III) hydroxide that can be made from the amounts that Employee X mixed in the second reaction? "

 

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