Honors Chemistry help plese

[MikeMike]

Ok we did a lab today in chemistry and we are doing the write up now. We have only been in the class two weeks and i have a few questions


Here was the Procedure
put 2 or 3 drops of aqueous Lead II Nitrate PB(NO3)2 and 2 or 3 drops of sodium iodide NaI, what compound would be formed from this? we came up with PbI (no balancing) or Lead Iodide is this correct?


Second problem
Put aqueous Copper II sulfate (CuSO4) and add a few grains of Iron (Fe) what would the rustic looking solid formed be? Iron Oxide? or what?

And what are the two products formed? I have no idea on this one

Third Problem
Put zinc (Zn) and aqueous hydrochloric acid (HCl) into a test tube. What gas is produced in this reaction? Hydrogen or what?


Please help our teacher has said we are on out own for this lab and we cannot figure thos problems out the others are not as confusing as these and we can figure them out. Please help

TIA
Mike

 

[agnitrate]

Originally posted by: nourdmrolNMT1
Ok we did a lab today in chemistry and we are doing the write up now. We have only been in the class two weeks and i have a few questions


Here was the Procedure
put 2 or 3 drops of aqueous Lead II Nitrate PB(NO3)2 and 2 or 3 drops of sodium iodide NaI, what compound would be formed from this? we came up with PbI (no balancing) or Lead Iodide is this correct?

Yep. That's a solubility rule. IIRC, Chloride, Iodide, and Bromide are soluble except in solutions of Ag, Hg, and Pb. So there's your precipitate.

Second problem
Put aqueous Copper II sulfate (CuSO4) and add a few grains of Iron (Fe) what would the rustic looking solid formed be? Iron Oxide? or what?

And what are the two products formed? I have no idea on this one

Think single replacement reaction. It has to do with the electronegativity of the ion I believe. The chemistry buffs here will correct me if I'm wrong but it's definitely a single replacement. You will get Cu(s) and FeSO4 as your products (assuming you use Fe +2, not +3).

Third Problem
Put zinc (Zn) and aqueous hydrochloric acid (HCl) into a test tube. What gas is produced in this reaction? Hydrogen or what?

Should be the same as the one above. Since the acid is already in aqueous, I'm pretty sure you will just get hydrogen gas like you stated. It seems like it would just be a simple single replacement from Zn(s) + HCl (aq) -> Zn(Cl)2 (s) + H2 (g). I'm not sure that zinc chloride yields a precipitate though. I'm pretty sure it doesn't but maybe somebody else knows better.

Good luck. Chemistry is fun.

-silver

 

[MikeMike]

thanks for that, more help would be good

 

[Mday]

Originally posted by: nourdmrolNMT1
thanks for that, more help would be good

hehehe

silver's comments are right on. the middle one threw me a bit, i am not very good with ternary compounds. all the *ites and *ates confuse my pee brain =P

anyway, nourdmrolNMT1 (wtf long ass nonsensical nick?), from a guy who's nick is agnitrate (silver nitrate)... i would take his word for it =P

 

[MikeMike]

Originally posted by: Mday

Originally posted by: nourdmrolNMT1
thanks for that, more help would be good

hehehe

silver's comments are right on. the middle one threw me a bit, i am not very good with ternary compounds. all the *ites and *ates confuse my pee brain =P

anyway, nourdmrolNMT1 (wtf long ass nonsensical nick?), from a guy who's nick is agnitrate (silver nitrate)... i would take his word for it =P

know ur damn role Nitro MT (1 is just there) NMT is my remote controlled nitro car

 

[agnitrate]

Originally posted by: nourdmrolNMT1

Originally posted by: Mday

Originally posted by: nourdmrolNMT1
thanks for that, more help would be good

hehehe

silver's comments are right on. the middle one threw me a bit, i am not very good with ternary compounds. all the *ites and *ates confuse my pee brain =P

anyway, nourdmrolNMT1 (wtf long ass nonsensical nick?), from a guy who's nick is agnitrate (silver nitrate)... i would take his word for it =P

know ur damn role Nitro MT (1 is just there) NMT is my remote controlled nitro car

Umm... perhaps that would be appropriate if there were a smiley or two in the post but otherwise, that's just plain rude.

-silver

 

[Howard]

He's saying his nick is no (know) ur (your) dm (damn) rol (role)

 

[rgwalt]

Problem 1: Solubility rules tell us that Lead Iodide will be formed. However, NO3 has a charge of -1, so lead must have a charge of +2. You can conclude this looking at the formula for Pb(NO3)2. Now, you should know that sodium has a charge of +1 and iodide has a charge of -1, so the balanced formula for lead iodide is PbI2. You can write and balance the equation on your own from there.

Problem 2: See AgNitrate's post

Problem 3: Hydrogen gas is evolved in the reaction. I don't believe that ZnCl (or ZnCl2, can't remember which) will precipitate out of solution. I don't have my gen chem book anymore...

Ryan

 

[MikeMike]

Thanks guys