PH quiq question

hi , i have a dillema , if i have 2 bottles of 2L of water each , one with an ph of 5.6 and one bottle of water with ph 7.4 , putting both in a same bottle (5L ) the ph will be (5.6 + 7.4) / 2 = 6.5 ?? i ask because i don't have a ph meter . I would not have wanted to truancy to chemistry classes in high school )

Lol atleast you know how to write out a proper equation!

But how do you know the ph of the two bottles? Also you don't need a PH meter. There's PH strips, and PH solutions that are like $4 at a pet store. I quit using my ph meter because it always loses calibration and what's a bigger pain in the ass than calibrating ph meters!


Edit* sorry I wasn't much help to your question!

I know the ph of water because those bottles are from the supermarket is "still water" (i don't know how to explain sure) or drinking water for human ) lol .and is writen on the label . i hope you understand what kind of water is . srry for my english.

Please allow me to discourage you from calculating ph this way.

Ph meters can be had relatively inexpensively.

without a meter, you will probly damage your plants eventually from lockout of some sort.


I would NEVER feed a solution that I had not ph'd.

Its just too cheap of an insurance.

What's hard about calibrating a pH meter? I do mine in RO water that I know is 7 and just set to 7. Don't try to be so exact. It's a myth that pH has to be 5.8. I don't worry about a pH anywhere from 5.5 to 7 after discussing it with my nute co. (Humboldt).

Yes I understand what you tell me, is just a MOMENT SOLUTION. I plan to buy a digital pH meter in maximum one week. .and I thought it would be okey so because of what I know best as a pH between 6.5-6.8 (from what I read on the forum) , i'm right?. I just have to know now. Thanks anyway ..

If you are in soil aim for 6.3 every time.

Thats where your microherd is going to buffer the ph anyway.

Why make them work hard to get there?

sidenote: there is a reason all the bottles say ph to 6.3 for soil.

Illegal Smile said:

What's hard about calibrating a pH meter? I do mine in RO water that I know is 7 and just set to 7. Don't try to be so exact. It's a myth that pH has to be 5.8. I don't worry about a pH anywhere from 5.5 to 7 after discussing it with my nute co. (Humboldt).

Click to expand...

Exactly why I stopped using it, as long as my color lies between 6.5 - 7, I'm golden! no need to calibrate ph meter every time I water.. And I never said it was hard, I said its a pain in the ass. But people do things differently so hey, whatever works for you more power to you, keep your system working and happy growing!

I feel that 6.3 to 6.8 pH is the "safe zone". I included the most commonly used pH chart below (for growing in soil). As for the equation "(5.6 + 7.4) / 2 = 6.5", we have to remember that 7 is neutral on the pH scale (essentially it is " 0 " ). So my theory would have to be that the equation would look more like:

5.6 = (-1.4)
7.4 = 0.4
(-1.4) + 0.4 = (-1) + 7 = 6.0 pH

... Again, just my theory .. When I get some time to return to my secret lair, I'll have to test to see if I'm correct . Does anyone else have any ideas or a degree in Chemistry???