Recent content by mrandersdk

They are for the whole range. But according to the color scale it would be easy to see if it is 7 (green) or 9 (Blue) We have just ordered some with a range of 6.2 to 7.8. To try and test in that specific range

Great information about the narrow pH strips, didn't know them. We will try to get them. About cleaning and care. The equipment is new, and I'm the only user of it. I have cleaned it and calibrated often, so I don't think that is the problem. @256bits Interesting suggestion. If the pH value...

Interesting suggestion. I have already tried to agitate it, and also heat it to try and speed up processes. But it didn't help. But I will try to look more into it. As I mentioned I tried to use litmus paper and it gave a ph of 6-7. That could suggest that it is a false reading of the probe...

It is not table salt (however we tested with that also). It is this kind of salt: https://www.eurowater.com/Admin/Public/DWSDownload.aspx?File=%2fFiles%2fFiler%2fCustomer+information%2fEnglish%2fY05A-42A-UK4_Salt+tablets_Leaflet.pdf

We have another hand held probe, and it gives the same result. However, the point about litmus paper is good. It does not show a value near 8 - 9, but rather 6 - 7. So I guess it is the probe that takes a logn long time to stabalize. However, I don't understand why recalibrating the probe...

But it doesn't work even if I start with a recalibrated probe, and I start meassuring after the NaCl is added and ome have desolved. I also get the same effect if I use tap water. If I meassure in only DI water, then I get false readings, but as soon as I add the NaCl the readings are...

Yeah I know the probe should not be in DI water. But I have dissolved a lot of NaCl so it should be ok I think.

Hello I have a problem when I dissolves NaCl in deionized water. I have a pH probe in my deionized water (lets say 1 L). Then I add 40 g of NaCl, imidiately the pH-value rises to about 9.0 (i'm logging hte pH value as a function of time). Then slowly the pH-value lowers, and after 11 hours ...

Hey thanks i think i got it. I will take a closer look at it tommorrow and try to post the generalization

Hello Today I looked at something that seems like it should have a simple solution, but I may have looked at for too long, and can't solve it. My problem is as follows. When you divide a whole number by a whole number n, then it is clear that the possible remainders are 0,1,2,...n-1. If you...

Hello Philip Thanks for your reply. You state my problem very clear. I will try to have a look at the reference you state, maybe his approach can inspire me to see a solution. It just puzzles me that the fact that equal energy per degree of freedom, is the condition for equilibrium, has not...

Chet i appreciate your trying to explain, but I think you misunderstand my problem. I'm not questioning that equilibrium is reached when objects have the same temperature, I know that's what happens. I just don't understand why. If the best explanation is that that's what we always observe...

The energy per atom for the ocean and the marble would be the same, assuming the same amount of degrees of freedom for the two. I reformulate my question: When the energy per atom is not is not the same for a mono and diatomic gas, at the same temperature, why will the diatomic not transfer...

This is my point. I know it is this way, but why is it so? Normally energies have to be equal, in this case it is the temperature. Why is it temperatures that have to match, and not the energies?

Not sure I understand what you mean. There are 3 vibrational direction. Because of a kinetic and potential term, vibrational energy in a solid will contribute 3kbT