Thread: "Home Work" Question...How is my answer?

Dusting off the cobwebs...been a while since I walked through these halls...

I'm working on my masters, and one of the questions, and the rough outline of my response is written below. I would very much appreciate it if ya'll could look over it, and give me some feedback. I can fill in the fluff before submitting it...I just want to verify that my logic, and math are on par. I'll fill in the safety and method details later.

Thanks in advance:

[redacted]

I think you have taken a rather roundabout way to arrive at the answer.
In your final solution of 500 g of 5% HCl, there is .05*500 = 25 g HCl .
The 37% stock solution has 37 g HCl per 100g stock. To get 25g HCl from a 37% stock solution you need
X *(37g HCl/100g stock) = 25g HCl
X=25*100/37= 67.57 grams of stock
This is how much stock you need to get 25 g HCl. The amount of water to be added is (500-67.57) grams.

I guess the irony of my second signature line is coming through. For some reason...I never thought of it from the standpoint of "I need 25g HCl...how do I get it...". I was trying to get everything down to grams.

I've never been good at formulas...always had to "think it out". I appreciate the feedback...and it's nice to know I was on target...even if I marched a hell of a long way around the woods to hit that target.