Borek - you misunderstood my post!
I was showing how NOT to calculate it in the first two instances - these are the common mistakes that people make - perhaps I should have made that clearer. I was trying to explain why people approach problems like this incorrectly. If you see in the first two parts I state "this does not take into account changes in volume on dissolution" (or WTTE)
The actual calculation is only the third part.
Sorry if I mislead anyone! 8)
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