Specialty Chemistry Forums > Citizen Chemist
Practical forum?
vmelkon:
--- Quote from: MarkPawelek on June 09, 2021, 03:45:29 AM ---TBH, I don't know whether the old screw/nut is brass or bronze, but the exposed metal has the same pink/salmon color of copper.
Surely this must be a common problem? Why are there no common, everyday, DIY, fixes for it? I found a Nitric acid DIY guide on youtube but it's sloppy. Add 100 ml of hydrochloric acid, does explain whether its dilute or concentrated acid!, and youtube comments are no place for clarifications. So the formula is:
1. In a small flask add 80g NaNO3, or nitrate equivalent (ammonia, potassium nitrates or even garden fertilizer are suitable alternatives).
2. Add 50ml water.
3. Dissolve in the water (use hot water?)
4. If you had to warm the above to dissolve it, let it cool.
5. Add 100ml hydrochloric acid (conc. or dilute?). Make sure you add slowly, and the temperature does not rise quickly.
PS: Never add hydrochloric acid quickly to anything hot. Adding it in 5 parts seems safe to me.
Looks like a good basic formula. Data such as solubility of NaNO3 in water is handy. Which is easy to get hold of.
I can do this. I feel so excited. I haven't done this kind of stuff since I was a kid!
I'll write it up.
--- End quote ---
1. Using hot water accelerates the rate at which the NaNO3 dissolves. Are you in a hurry? NaNO3 is very soluble and quickly dissolves at 20 °C. Relax. Take it easy. Slow down.
2. Hardware store HCl tends to be at maximum concentration. 10 M. If you open the bottle, it emits white fumes. Keep the fumes away from your face. When done, keep it in a closed polyethylene bag.
3. Adding water might be a good idea to reduce the concentration of the HCl.
4. That recommendation for adding an acid to water seems to be mostly for conc H2SO4. It is a very exothermic reaction. I haven’t noticed heating when adding HCl to water.
5. I recommend that you try 1 M concentration for your HNO3.
6. I’ve tried KNO3 + HCl and also a wire of copper. It’s fun. It slowly attacks the copper. The presence of H+ and NO3- is needed to oxidize copper.
Some people use HCl and H2O2 (I think store bought 3% which is mighty weak).
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