Chemistry help

[blαh2355]

I tried looking at answers on google but they didn't help explain much on how to do it so here goes. Can you guys please help me with this? What mass of Na2CrO4 is required to precipitate all of the silver ions from 75 ml of .100 M solution of AgNO3?

[Foofoojack]

http://lmgtfy.com/?q=What+mass+of+Na2CrO4+is+required+to+precipitate+all+of+the+silver+ions+from+75+ml+of+.100+M+solution+of+AgNO3%3F

[Rocket50]

I tried looking at answers on google but they didn't help explain much on how to do it so here goes. Can you guys please help me with this? What mass of Na2CrO4 is required to precipitate all of the silver ions from 75 ml of .100 M solution of AgNO3?

Oh boy. Organic chem. It's been 3 months, but I'll try.

okay, so you have 75ml of .100 M AgNO3, and what to know how much of the other crap will precipitate it. First, create the equation. It is a double substitution reaction.

Na2CrO4 + AgNO3 -> NaN03 + Ag2CrO4

Balance

Na2Cr04 + 2AgNO3 -> 2NaNO3 + Ag2CrO4



Find the number of moles in 75ml of .100M solution of AgNO3

0.075L AgNO3 x (0.100M / 1L)

= 7.5x10^-3 moles of AgNO3

So according to the equation, it would require only half the amount of Na2CrO4 to react with the all the AgNO3 molecules, so therefore it would require only half the number of moles of Na2CrO4 to react with all of the AgNO3, so 7.5x10^-3 / 2 = 3.75x10^-3 mols of Na2CrO4. Find mass. Sig. Figs.

[blαh2355]

http://lmgtfy.com/?q=What+mass+of+Na2CrO4+is+required+to+precipitate+all+of+the+silver+ions+from+75+ml+of+.100+M+solution+of+AgNO3%3F

I tried looking at answers on google but they didn't help explain much on how to do it

Yeah that helps so much.

Oh boy. Organic chem. It's been 3 months, but I'll try.

Na2CrO4 + AgNO3 -> NaN03 + Ag2CrO4

I think you just nailed it. But when you wrote out that first equation, where'd the Ag2 come from?

[Rocket50]

Yeah that helps so much.

Refresh

[Rocket50]

Yeah that helps so much.
I think you just nailed it. But when you wrote out that first equation, where'd the Ag2 come from?

CrO4 has charge of -2, and Ag +1

[blαh2355]

Thanks for the help rocket.

[Cake Faice]

http://lmgtfy.com/?q=What+mass+of+Na2CrO4+is+required+to+precipitate+all+of+the+silver+ions+from+75+ml+of+.100+M+solution+of+AgNO3%3F

Way to read the OP.

And I hope to god that's not high school chemistry.

[Rocket50]

Thanks for the help rocket. :)

No prob :P

Way to read the OP.

And I hope to god that's not high school chemistry.

IT IS

[blαh2355]

Way to read the OP.

And I hope to god that's not high school chemistry.

AP Chem, summer assignment :L

[Rocket50]

AP Chem, summer assignment :L

What grade is this

[Tiger Guy]

AP Chem, summer assignment :L

>AP

That's the real problem breh.

[Rocket50]

>AP

I did this in grade 11 ._.

[blαh2355]

I did this in grade 11 ._.

As will I. I took the tree line second from the top.

[Rocket50]

As will I. I took the tree line second from the top.

LOL. AP classes.

I was offered AP math and AP science, but I said, "fuck thattttt, extra work for bragging rights and lower GPA is stupid"