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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: iced on September 14, 2008, 01:17:56 PM

Title: Calculatin Ion Concentration
Post by: iced on September 14, 2008, 01:17:56 PM

Hey guys I am having a small problem that I can not seem to get right.

Question: The chief ions in seawater are Na+, Mg2+, and Cl-. Seawater is approx. 0.438 M NaCl and 0.0512 M MgCl2. What us the mass Cl- (that is the total [Cl-] in seawater?

I know the procedure to calculate M, but when I write the balanced equation I keep getting 3 mols of Cl-.

NaCl + MgCl2 --h20 > Na+ + Mg2+ + 3Cl-

If someone could write the entire solution step by step that would be great.

Thanks in advance.

Title: Re: Calculatin Ion Concentration
Post by: Borek on September 14, 2008, 01:40:52 PM

No such thing as balanced equation for this question, there is no reaction between NaCl and MgCl₂, and they are just in a mixture.

What is concentration of Cl^- from NaCl? From MgCl₂? Add.

Title: Re: Calculatin Ion Concentration
Post by: iced on September 14, 2008, 01:47:08 PM

Ah, no wonder I could not get the correct answer. Thank you!