Thank you so much for your amazing answers! Probably the best responses I have gotten in any forum ever!

Well the first thing I'd do is probably equip a stir bar to mix the ingredients, and increasing the volume would probably help sustain the reaction as well. In the end, though, like any reaction the only way to keep it going is to remove products as they are formed, which would mean counteracting the pH change. Unfortunately the reaction is inherently self-limiting.

At this point it becomes a chemical engineering problem. I could envision using a pump and circulator to continually cycle fresh brine across the electrodes. In effect, make the solution volume infinite (as long as your reservoir doesn't run out).

Im not sure of how to proceed and Im kind of just stumbling along.

The class lab had us pump dry air into the flask for 5 minutes, then plug it and weigh it.

There is a dry air chart.

So far I have these steps:

1. Fill flask with dry air.
2. Weigh flask.
3. Find volume of flask.
4. Use volume of flask and dry air density to find the mass of air.
5. Subtract mass of air from air+flask+stopper to find flask weight.

The instructions dont say to weigh any of this stuff independently. I dont think I'll be able to correct for the weight of the plug (cork and small rubber stopper for cork hole).

6. Fill the flask with CO2.
7. Plug and weigh flask with CO2.
7a. Measure temp of flask atfter weighing CO2
8. Fill flask with water to brim, plug, wipe outside dry, weigh.
9. Use this to find the volume.

Instructions were not given to measure temp, but temp was measured for the CO2 after it cooled, so I suppose I just use room temp for the water.

I think I need to use the density of water table with temperature to find volume, however in all of this I still dont have the mass of the flask, so I cant exactly use water mass and flask mass to find volume.

Measured stuff:

Mass of flask with stopper, plug, filled with air. in grams. 131.4413
Mass of flask with stopper, plug, filled with CO2. in grams. 131.6014
Mass of flask with stopper, plug, filled with water. in grams. 396.64
Temp of flask 21.0 C
Baro pressure 755.18 torr
Absolute temp 294.K
Pressure 0.99366 atm.

The instructions for the lab discuss buoyancy as well. Is this part of how to discover the mass of the flask using only water stopped at the top of the vessel and weighing the mass of both flask and water together and using the density of water table for 21.0 C?

Further question, should I be limiting atm to significant digits when converting from torr? I already did here. Should I be limiting temp to significant digits from celcius? Round two has 21.4 C, so there are 4 actual digits in the Kelvin temp, but I rounded it to 294. again.

Hi guys, I had a question about aspen since I am using it for my design project. I am simulating a HRSG and was wondering how I would find the efficiency so I can see how it changes when changing temps of evap, econ and superheater?

I have attached what I have so far, the current issue I am facing is that the volume of steam (under the results summary for all streams) only changes when I change the final steam temp and not any of the other temps.

Any help would be greatly appreciated.

Rather than reproducing the wheel here, I can direct you to one of many videos on the internet that describe what happens during elecrtolysis of brine:

E.g., https://www.youtube.com/watch?v=9X-ht85YYsI

Notice around the time 1:25, the "reverse diffusion" you have been asking about.

The gas you seen in your video liberated will be the hydrolysis products of brine, for example hydrogen and chlorine gas. (Do note, chlorine gas is toxic and hydrogen is explosive, so you should do this in a well-ventilated space without ignition sources.

The reason your visual reaction slows down is two-fold: first, the pH raises because one of the biproducts of brine electrolysis is NaOH; also side reactions can cause rapid buildup (say, of oxides) on your electrode surfaces, which decreases their efficiency. This is why electrochemical cells utilize things like salt-bridges prevent this kind of thing. As you can see, it happens pretty quickly.