Question

I am figuring out how much KCL will dissolve in 50 grams of water at sixty degrees, based on a graph. According to the graph, 45 grams of KCL can dissolve at 60 degrees. So I subtracted 45 from 50, and got five. The thing is my book said the answer should be between somewhere between 18 and 25 (the graphs' scales aren't small enough to be exact, so 45 was an estimate. But even if I adjust my 45 number a bit, there is still no way the answer could be 22. What did I do wrong? Thank you for cleaning this up!!

Answer 1

Why did you subtract 50-45? I can't understand what that has to do with the problem. My best guess is that most graphs of solubility give the grams that will dissolve in 100 g water. You don't say what the scale is; look at your graph ans see what volume that 45 g you estimate from the graph is. It may be 100 g solution, too. If it is 100 g water, then 1/2 of 45 or 22.5 would be the solubility in 50 mL water and that would agree with the book's answer. I hope this helps.

Answer 2

yah son