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### Topic: Chemical equations, help needed  (Read 21626 times)

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#### Sbaraka

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##### Chemical equations, help needed
« on: May 16, 2009, 09:45:57 PM »
I need some help figuring out how to do these chemical equations and also perhaps if you could tell me as to what type of reaction it is (single replacement reaction, double replacement reaction etc.) these are suppose to be ionic as well if that makes a difference.

Ferric Nitrate + potassium thiocyanate = Iron (III) Thiocyanate + Potassium Nitrate
Fe (NO3)3 + KSCN → Fe (SCN)+2 + KNO3

the one above i figure to be wrong because i can't balance it.

calcium chloride + acetic acid + ammonium oxalate
CaCl2 + CH3COOH + (NH4)2C2O4 →

Ammonium molybdate + sodium hydroxide
(NH4) 2MoO4 + NaOH →

Barium Chloride + Nitric acid + sulfuric acid
BaCl2 + HNO3 + H2SO4 →

Sodium Sulfate + Barium Chloride
Na2SO4 + BaCl2 →

Sodium Phosphate + Nitric acid + Ammonium Molybdate
Na3PO4 + HNO3 + (NH4)2MoO4 →

Sodium Chloride + Nitric acid + Silver Nitrate
NaCl + HNO3 + AgNO3 →

Acetic acid + Iron (III) Chloride
CH3COONa + FeCl3 →

how do i go about solving these?

any sort of help/assistance is appreciated

#### Borek

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##### Re: Chemical equations, help needed
« Reply #1 on: May 17, 2009, 04:31:30 AM »
First, write left sides in forms of ions.

Second - consult solubility tables. Where do you see ions that will give precipitate?
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#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #2 on: May 19, 2009, 03:30:21 AM »
okay what about the ones with three things like this one

CaCl2 + CH3COOH + (NH4)2C2O4 → CaC2O4 + CH3COOH + NH4Cl

like does the acetic acid just stay on its own? how do i tell what happens with all those elements. and apart from the acetic acid part is it right?

and with the first one i did on the original post, the ferric one, how do i fix it?

ps. is there an edit button? i can't seem to see it.
pss. nevermind looks like you just can't edit the original post

EDIT: just gonna keep adding them as i do them. (these are not balanced, i just want to know if i'm doing it right)

(NH4) 2MoO4 + NaOH → NH4OH + (Na) 2 MoO4

Na2SO4 + BaCl2 → Ba SO4 + NaCl

#### Borek

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##### Re: Chemical equations, help needed
« Reply #3 on: May 19, 2009, 04:10:09 AM »
I already told you - go net ionic.
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#### AWK

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##### Re: Chemical equations, help needed
« Reply #4 on: May 19, 2009, 04:33:03 AM »
Quote
okay what about the ones with three things like this one

CaCl2 + CH3COOH + (NH4)2C2O4 → CaC2O4 + CH3COOH + NH4Cl

like does the acetic acid just stay on its own? how do i tell what happens with all those elements. and apart from the acetic acid part is it right?

Do not use the acetic acid in the equation, which is used to ensure us the precipitate is just calcium oxalate (insoluble under this condition) - moreover should be 2NH4Cl
AWK

#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #5 on: May 19, 2009, 05:56:14 AM »
thanks for the help guys. really starting to understand how to write the equations, in the past i've just been given say the left side of the equation, told to swap the cations etc which doesn't really help me learn when and stuff.  and balancing. thats it really.

I already told you - go net ionic.

is this referring to the Iron(III) equation?(the first one) i think i fixed it?

Fe (NO3)3 + 3KSCN → Fe (SCN)3 + 3KNO3

CaCl2 + (NH4)2C2O4 → CaC2O4 + 2NH4Cl

so is that correct then? and AWK i previously stated that i haven't bothered balancing them yet, just trying to get the basic equation right.(above ones are balanced)

#### Borek

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##### Re: Chemical equations, help needed
« Reply #6 on: May 19, 2009, 06:16:06 AM »
is this referring to the Iron(III) equation?(the first one) i think i fixed it?

No, I mean all the reactions.

Net ionic means: show everything as ions, cancel whatever is just a spectator.

Adding information about phase (like (aq), (s) and so on) won't hurt.
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#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #7 on: May 21, 2009, 02:50:35 AM »
lil question, got a compound with ferric potassium and nitrate, what's the correct name for it? i remember someone saying something like, ferrous pottassium nitrate or something along those lines.

and you know how when doing an experiment, say you have calcium chloride, and you add some acetic acid, then you add ammonium oxalate. is there a name for the acetic acid/ammonium oxalate (because the acetic acid does something but doesn't create the positive/negative reaction, and how the ammonium oxalate does)
is there a name for these types of chemicals in experiments?
« Last Edit: May 21, 2009, 03:06:20 AM by Sbaraka »

#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #8 on: May 21, 2009, 03:52:31 AM »
Whatsup with the modify tool? can't seem to modify previous post...

just asking if there is a gas given off when Sodium Hydroxide is added to ammonium Molybdate?
chemical equation?? (this is what i think it to be, but i haven't got a gas in there being put off.)
(NH4) 2MoO4 + 2NaOH → 2NH4OH + Na 2MoO4

the reason i ask this is because in my ammonium test, i use red litmus paper to indicate the presence of ammonium through the acidity, but without putting the litmus paper in the solution, which leads me to think that there is a gas being put off? oh by the way the solution got heated for 5 minutes before the litmus paper was placed inside the test tube(but not in the liquid)
« Last Edit: May 21, 2009, 04:04:21 AM by Sbaraka »

#### Borek

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##### Re: Chemical equations, help needed
« Reply #9 on: May 21, 2009, 04:28:15 AM »
If there was an excess NaOH, what will happen to water ammonia solution?
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#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #10 on: May 21, 2009, 05:00:38 AM »
think i figured it out, Ammonium Hydroxide gas.

any help with this though?

Quote
you know how when doing an experiment, say you have calcium chloride, and you add some acetic acid, then you add ammonium oxalate. is there a name for the acetic acid/ammonium oxalate (because the acetic acid does something but doesn't create the positive/negative reaction, and how the ammonium oxalate does)
is there a name for these types of chemicals in experiments?
« Last Edit: May 21, 2009, 05:15:23 AM by Sbaraka »

#### cliverlong

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##### Re: Chemical equations, help needed
« Reply #11 on: May 21, 2009, 05:26:05 AM »
think i figured it out, Ammonium Hydroxide gas.

No. There is no such gas

Ammonium hydroxide is a way of thinking about what is produced when ammonia (partially) dissolves in water

Look at

http://en.wikipedia.org/wiki/Ammonium_hydroxide

Look at the equation for the reaction

Particularly look at the double-headed arrow. What do you know about such reactions? As Borek asked, what is the effect of adding excess (sodium) hydroxide to such a solution?

Clive

#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #12 on: May 21, 2009, 08:02:13 AM »
i dont know much about chemistry so i'm kinda just taking pot shots here. but sodium is like the most reactive thing i know of that we use at school. so im guessing something like the sodium would replace the ammonium? kicking out the ammonia on its own? by itself as a gas? i really have no idea....

i tried googling it and stuff but i couldn't find nothing

#### Borek

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##### Re: Chemical equations, help needed
« Reply #13 on: May 21, 2009, 08:30:32 AM »
You don't start with a solution of gaseous ammonia, but with a solution of NH4+. This is a weak acid, that reacts with sodium hydroxide (more like hydroxide, than sodium).
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#### Sbaraka

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##### Re: Chemical equations, help needed
« Reply #14 on: May 21, 2009, 08:33:28 AM »
i give up, thanks for the help guys, been a massive help.
really appreciate it, just gonna finish what i can of this report then hand it in tomorrow, i should pass none the less.

so once again thanks, might just stick around these forums and see what i can learn.