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Topic: Metal Reaction with Acid: Zn + 4HNO3 -> Zn(NO3)2 + 2NO2 + 2H2O  (Read 9685 times)

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ewaters140

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Metal Reaction with Acid: Zn + 4HNO3 -> Zn(NO3)2 + 2NO2 + 2H2O
« on: May 22, 2006, 08:25:36 PM »
Alright i don't get any of this and i was hoping that someone could help
 We did a 5 part lab dealing with the reactions with zinc and different acids
Part 1
Zn + 4HNO3 -> Zn(NO3)2 + 2NO2 + 2H2O

3.75 g Zinc in 20 mL of 10M Nitric Acid

1. What is the Normality of nitric Acid? i got 50 N i think thats wrong though anyone know the answer

2. Mass of Zinc Nitrate predicted to be produced? I got 9.47g ?

Part 2 and 3 coming in next post
« Last Edit: May 23, 2006, 09:41:12 AM by Mitch »
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Offline Will

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Re: Help
« Reply #1 on: May 22, 2006, 08:30:36 PM »
Quote from: ewaters140 on May 22, 2006, 08:25:36 PM
We did a 5 part lab dealing with the reactions with copper and different acids
Part 1
Zn + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O

3.75 g Zinc in 20 mL of 10M Nitric Acid

1. What is the Normality of nitric Acid? i got 50 N i think thats wrong though anyone know the answer

2. Mass of Zinc Nitrate predicted to be produced? I got 9.47g ?

Theres a little bit of a mix-up between Zn and Cu here! I counted 3 zincs and 2 coppers, so could you clarify what you meant. Thanks. ;)
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ewaters140

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Re: Help
« Reply #2 on: May 22, 2006, 08:32:49 PM »
sorry my bad its all supposed to be zinc not copper i fixed it
« Last Edit: May 22, 2006, 08:38:03 PM by ewaters140 »
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ewaters140

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Re: Help i feel dumb
« Reply #3 on: May 22, 2006, 08:43:41 PM »
*Ignore me, I am impatient*
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Offline syko sykes

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Re: Help i feel dumb
« Reply #4 on: May 22, 2006, 08:55:37 PM »
first off don't *Ignore me, I am impatient*

secondly, for #2 i got 9.38 grams... could just be a difference in rounding or something... how did you get 9.47 grams
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Offline Will

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Re: Help i feel dumb
« Reply #5 on: May 22, 2006, 09:01:27 PM »
I have never used normality before, but from what I've read about it, it seems that for a monoprotic acid like HNO3 the normality is the same as the molarity, ie. 10N. ??? All the websites that try and explain normaility are quite useless!

I got 9.47085g, so 9.47g is fine (use 65.409 as Mr for Zn, and 14.007 as Mr for N and 15.999 as Mr for O).
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Offline syko sykes

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Re: Help i feel dumb
« Reply #6 on: May 22, 2006, 09:17:50 PM »
nevermind, 9.47 is right for number 2... i misread the equation before he changed so i was using the molar mass of Cu instead of Zn
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ewaters140

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Re: Help i feel dumb
« Reply #7 on: May 22, 2006, 09:34:45 PM »
anything on normality?
thanx so much for this
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Offline Borek

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Re: Help i feel dumb
« Reply #8 on: May 23, 2006, 03:19:19 AM »
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