how much anhydrous sodium carbonate will dissolve in 1 liter of distilled water?

immortl · 08/10/2019, 06:13 PM

As the title asks, how many grams of anhydrous sodium carbonate can one dissolve in a liter of distilled water, to be used for dosing?

I'm currently trying to dissolve 150g into 1.5 liters of water, and well, it's not all dissolving, even with lots of stirring. I've seen posts where people claim to dissolve 200g in 1 liter which is twice what I'm trying to do.

From what I recall from college chemistry, perhaps warming the water up some might help, but am wondering if it would come out of solution as it cooled.

So... I am looking for guidance on how much anhydrous sodium carbonate I can dissolve into 1.5 liters of water overall.

Thanks,
Joe

bertoni · 08/11/2019, 07:43 PM

You could try heating it. That will increase the solubility. The solubility limit should be around 594 gr of sodium bicarbonate plus water plus heat to form 1 gallon of solution. The equivalent should be about 374 gr anhydrous sodium carbonate.

I get this equation:

2 NaHCOOH -> Na₂CO₃ + CO₂ + H₂O

which means a loss of about 37% of mass, since the molecular weight of sodium bicarbonate is about 84, and sodium carbonate is about 106.

106 / (2 * 84) = .631

08/10/2019, 06:13 PM	#1
immortl Registered Member Join Date: Jan 2012 Posts: 114	how much anhydrous sodium carbonate will dissolve in 1 liter of distilled water? As the title asks, how many grams of anhydrous sodium carbonate can one dissolve in a liter of distilled water, to be used for dosing? I'm currently trying to dissolve 150g into 1.5 liters of water, and well, it's not all dissolving, even with lots of stirring. I've seen posts where people claim to dissolve 200g in 1 liter which is twice what I'm trying to do. From what I recall from college chemistry, perhaps warming the water up some might help, but am wondering if it would come out of solution as it cooled. So... I am looking for guidance on how much anhydrous sodium carbonate I can dissolve into 1.5 liters of water overall. Thanks, Joe

08/11/2019, 07:43 PM	#2
bertoni RC Mod Join Date: Mar 2002 Location: Mountain View, CA, USA Posts: 88,616	You could try heating it. That will increase the solubility. The solubility limit should be around 594 gr of sodium bicarbonate plus water plus heat to form 1 gallon of solution. The equivalent should be about 374 gr anhydrous sodium carbonate. I get this equation: 2 NaHCOOH -> Na₂CO₃ + CO₂ + H₂O which means a loss of about 37% of mass, since the molecular weight of sodium bicarbonate is about 84, and sodium carbonate is about 106. 106 / (2 * 84) = .631 __________________ Jonathan Bertoni