Solubility Rules

[denttiger]

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Hey! Does anyone know a good place to learn these. I memorized the 7 points in the Kaplan Blue Book.. like all salts of the NH4+ ion are soluble... But then I came across a question that went completely against one of them. It said that CaSO4 was soluble when one of the Kaplan rules definately said it wasn't. So now I'm just wondering about these and I want to make sure I know them! So any advice or help would be great! Thanks in advance!

 

[jdmsamurai]

SO4- is soluble i think

 

[scottyhoop]

Best bet would be your class room text. Mine has a decent table so let me know if you need it. I could type it up quickly if needed.
Scott

 

[poc91nc]

Every book varies slightly...but this is the one I use

Soluble:
- Group I and ammonium
- Nitrate, acetates, perchlorates
- Chloride, Iodide, bromide; except with copper(I), silver, lead(II), and Mercury(II)
- Sulfates; except with lead(II), strontium, calcium, barium

Insoluble:
- carbonates and phosphates
- hydroxides; except with group I, ammonium and group II starting with calcium and down
- sulfides, except with group I, II, and ammonium

 

[denttiger]

Hey thanks to everyone! Poc91nc that is the same chart I used and that is why I missed the CaSO4 question.. cuz my chart said it was insoluble.. who knows. Thanks again

 

[PD3]

Hey thanks to everyone! Poc91nc that is the same chart I used and that is why I missed the CaSO4 question.. cuz my chart said it was insoluble.. who knows. Thanks again

But his chart says sulfate is insoluble with Ca?

 

[denttiger]

yeah I know.. but in my original post I said the answer to the question said it was Soluble.

 

[doc toothache]

Hey! Does anyone know a good place to learn these. I memorized the 7 points in the Kaplan Blue Book.. like all salts of the NH4+ ion are soluble... But then I came across a question that went completely against one of them. It said that CaSO4 was soluble when one of the Kaplan rules definately said it wasn't. So now I'm just wondering about these and I want to make sure I know them! So any advice or help would be great! Thanks in advance!

try www.ausetute.com.au/solrules.html

 

[poc91nc]

According to Linus Pauling calcium sulfate is sparingly soluble, while sulfates of strontium, barium and lead are insoluble (more than 1g/100ml of water).

However...most modern texts aren't as nitpicky and usually have calcium sulfate as insoluble.

 

[denttiger]

Okay.. thanks a lot!!!

 

[thefifthbeatle]

I doubt the DAT would ask this.........