Homework Help: Chemistry

Posted by Fred on Sunday, November 16, 2008 at 8:36pm.

I did a lab in which I added ionic solutions to tap and distilled water and another ionic solution. Distilled water is the control because it does not react to any solutions since it doesn't contain ions. But one of the lab questions I need to answer is:
These tests cannot absolutely confirm the absence of an ion. Why?
Thank you for helping.

Chemistry - GK, Monday, November 17, 2008 at 7:55pm
Before a compound precipitates, the solution must become saturated with it. If the concentration of this compound is below saturation because one of the solutions mixed is too dilute (such as contaminated distilled water), no precipitate forms.

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