[pcubis]

I have 3.6 mL of potassium phosphate in a 180 L solution.  I want to know how many mg/L of K is in that solution.  Any help would be greatly appreciated.  Thank you in advance.

[Yggdrasil]

Potassium phosphate is a solid, so it doesn't make sense to talk about mL of potassium phosphate.  Do you mean that you have 3.6mL of a potassium phosphate solution diluted in 180L?  In this case you would need to know the concentration of your potassium phosphate solution and use M_initialV_initial = M_finalV_final to find the molarity in the dilution.

[pcubis]

Potassium phosphate is a solid, so it doesn't make sense to talk about mL of potassium phosphate.  Do you mean that you have 3.6mL of a potassium phosphate solution diluted in 180L?  In this case you would need to know the concentration of your potassium phosphate solution and use M_initialV_initial = M_finalV_final to find the molarity in the dilution.

I am sorry.  Yes, I do mean that I have 3.6 mL potassium phosphate solution diluted in 180L.  The equation I am familiar with but I am still confused.  If I am only given that much info.  I was wondering if there was a way of working backwards to attain the concentration? Thank you for your response. 

[Yggdrasil]

You currently do not have enough information to determine the concentration of potassium in your dilution.

[pcubis]

You currently do not have enough information to determine the concentration of potassium in your dilution.

I finally tracked down the person that made the solution and got them to tell me the concentration.  I appreciate your responses in attempt to help me.