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G.21 (a) Lingering Question

Posted: Sat Oct 07, 2017 6:20 pm
by Andy Liao 1B
The problem is:
G.21 A solution is prepared by dissolving 0.500 g of KCl, 0.500 g of K2S, and 0.500 g of K3PO4 in 500. mL of water. What is the concentration in the final solution of (a) potassium ions; (b) sulfide ions?

I know that to find the total moles of K+ in the solution, you have to first find the number of moles of each compound, then calculate the number of moles of K+ in each compound, and finally add together the number of moles of K+ in each compound. However, I was wondering if instead of calculating the number of moles of K+ in each compound separately and then adding those numbers up, you could first add the number of moles of each compound and then find the total number of moles of K+ from there. Is the latter a valid approach?

Re: G.21 (a) Lingering Question  [ENDORSED]

Posted: Sat Oct 07, 2017 6:42 pm
by Chem_Mod
This approach is valid for finding the total moles of K+.