Removing Pb2+ from Water: EPA Standards & NaCl Solution

[sveioen]

[SOLVED] Removing Pb from water

The Environmental Protection Agency recommends that Pb2+ have a concentration not exceeding 1.00 x 10-7 M in drinking water. What concentration of NaCl could be used to remove the lead from the water to bring it to a safe level? Ksp for PbCl2 is 1.6 x 10-5. What would the drawbacks of doing this be?

Could anyone get me going with this?

 

[gravenewworld]

Could anyone get me going with this?

Ksp=[Pb2+][Cl-]^2 by definition.

You are given the KSP and Pb2+ values, simply find the concentration of Cl-. You will notice that you will need a LOT of salt to do this, and creating highly saline environments in water sources kills a lot of plants and wildlife.

 

[sveioen]

Ksp=[Pb2+][Cl-]^2 by definition.

You are given the KSP and Pb2+ values, simply find the concentration of Cl-. You will notice that you will need a LOT of salt to do this, and creating highly saline environments in water sources kills a lot of plants and wildlife.

Wow, so it is that easy. Thank you very much gravenewworld!

 

[lightarrow]

Wow, so it is that easy. Thank you very much gravenewworld!

Ok, however don't do it with hot water, or you'll kill people (PbCl2 is quite soluble in hot water).
Furthermore, precipitating Pb with Cl- obviously take in solution the anion and this one can be not appropriate itself for a drinking water: NO3- for example.

 

[jim mcnamara]

This sounds more like Chemistry 101 homework than somebody with bad well water. But, you never know.

 

[lightarrow]

This sounds more like Chemistry 101 homework than somebody with bad well water. But, you never know.

Agree