Tswienton Posted June 2, 2019 Posted June 2, 2019 (edited) Please forgive me if this is under the wrong branch of science but I considered it to Be electrochemistry. I have been trying to build a hydrogen converter to get oxyhydrogen gas. I built my converter but had some problems, here was my setup: I used a plastic bottle, and drilled to holes in the side. In each of these holes a placed a stainless steel screw. I took 8 rechargeable AA batteries for my power supply. They are all rated for 1.5 volts but using my multimeter they were only 1.3( doesn’t matter too much to me). I put them in series and checked to see that they were 10 volts, which it thought would be good enough for splitting water. I used alligator clips to connect the positive and negative ends and I didn’t see anything happening. The water had baking powder in it, which has baking soda in it, which should conduct electricity. I tried putting a single 9 volt in and saw a bit of small bubbles forming. I was thinking that maybe there was not enough amps but I used my multimeter and it seas something like 10 amps. I also used my multimeter on either side of the circuit and it didn’t show any current so I was thinking maybe the gap between th electrodes was too far. But the i just put the alligator clips in a and still nothing happened. I have seen people on YouTube run these things off of 12 v car batteries and I’m only two volts away. I only have a basic knowledge of electricity and how amps and volts work and all that, so I don’t understand it very well, and was just wondering if anybody could help me out, Thanks! Edited June 2, 2019 by Tswienton
chenbeier Posted June 2, 2019 Posted June 2, 2019 How do you could measure 10 amps? Only some Milliampere is enough to split water. The voltage is also high enough. It looks like you have somewhere a interuption of the circuit.
Strange Posted June 2, 2019 Posted June 2, 2019 On 6/2/2019 at 5:03 AM, Tswienton said: I was thinking that maybe there was not enough amps but I used my multimeter and it seas something like 10 amps. 10 amps at 10 volts? That's 100W; something should be getting very hot. 3 hours ago, Tswienton said: The water had baking powder in it, which has baking soda in it Not sure it is relevant, but that will react in water to produce CO2 gas (and leave sodium tartrate dissolved in the water).
Sensei Posted June 2, 2019 Posted June 2, 2019 23 minutes ago, Strange said: Not sure it is relevant, but that will react in water to produce CO2 gas (and leave sodium tartrate dissolved in the water). NaHCO3 -> NaOH + CO2
Strange Posted June 2, 2019 Posted June 2, 2019 30 minutes ago, Sensei said: NaHCO3 -> NaOH + CO2 Baking powder is a mixture of sodium bicarbonate and tartaric acid
Sensei Posted June 2, 2019 Posted June 2, 2019 13 minutes ago, Strange said: Baking powder is a mixture of sodium bicarbonate and tartaric acid You're simplifying it. Not "it is", but "it can be".. depending on manufacturer of specific powder. In "Original preparations" section of https://en.wikipedia.org/wiki/Baking_powder only 2 out of 7 prescriptions have cream of tartar as ingredient mentioned. The all rest some other acid. i.e. Dr. Oetker's Baking Powder has mentioned phosphatic. If powder used to be made of cream of tartar i.e. KC4H5O6 https://en.wikipedia.org/wiki/Potassium_bitartrate after release of CO2 by NaHCO3, it will still contain KC4H5O6 unless KC4H5O6 also will decompose due to electrolysis (f.e. too high voltage), or react other way.
Strange Posted June 2, 2019 Posted June 2, 2019 3 minutes ago, Sensei said: You're simplifying it. Not "it is", but "it can be".. depending on manufacturer of specific powder. Interesting. I didn't know there was so much variability.
John Cuthber Posted June 2, 2019 Posted June 2, 2019 4 hours ago, Sensei said: NaHCO3 -> NaOH + CO2 WTF? 2 hours ago, Sensei said: after release of CO2 by NaHCO3, it will still contain KC4H5O6 Bicarbonate of soda reacts with potassium bitartrate to produce potassium sodium tartrate (known as Rochelle salt) carbon dioxide and water.
Sensei Posted June 2, 2019 Posted June 2, 2019 11 minutes ago, John Cuthber said: Bicarbonate of soda reacts with potassium bitartrate to produce potassium sodium tartrate (known as Rochelle salt) carbon dioxide and water. ...you're missing the one important thing.. "if there are uniformly mixed" (which is, more or less, the case if you're baking cake)... But OP is dissolving it in water.. check potassium bitartrate solubility in water (0.57 g/100 mL @ 20 °C). Sodium bicarbonate solubility in water is 96 g/L @ 20 °C.. Don't just take equation from the book (or Wikipedia), without rethinking environment, in which compounds will react.. 31 minutes ago, John Cuthber said: 4 hours ago, Sensei said: NaHCO3 -> NaOH + CO2 WTF? Okay. 2 NaHCO3 → Na2CO3 + H2O + CO2
John Cuthber Posted June 2, 2019 Posted June 2, 2019 It is true that the solubility of potassium tartrate in water is quite low. It is also, of course, irrelevant. The environment in which it is present is a solution of bicarbonate of soda, in which it is much more soluble- because it reacts. You should read your own "advice" 24 minutes ago, Sensei said: ...without rethinking environment, in which compounds will react.. Your perspective is absurd anyway. If the tartar didn't react, what would be the point of putting it there? Of course it reacts. 27 minutes ago, Sensei said: check potassium bitartrate solubility in water (0.57 g/100 mL @ 20 °C). It makes rather more sense to check something we don't actually know. How much did the OP use. If it's a teaspoonful of baking powder in a litre of water then there's enough water to dissolve it anyway.
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