Hello,

I am teaching for my first time this semester. In writing my exam, I felt pretty good about most of my questions except one.

I was wondering if anyone could provide feedback on their initial assessment of the question. My hope is that the students will use a shortcut to show that at unit activity the corrosion process still moves forward in 0.1M instead of doing a second full calculation.

Any thoughts?

1) Will pure cobalt react with 0.1M HCl? Assume a starting concentration of 1x10-12 Co2+ ions in solution. Is there an activity/concentration of Co2+ ions that will cause the reaction between 0.1MHCl and pure cobalt to stop? (40 points)