Mixing nutes, PH question

I want to know if it's okay to mix nutes hours or even days in advance and if the PH will stay the same or change over time? Because sometimes I will have about a half a gallon left over, and I'm wondering if I use it 4-6 days later...will it still have the same PH from a few days ago or will I have to correct it again?


Also what do you guys think about mixing one nute solution with the correct PH and another nute solution (in a diff container) with the correct PH (in this case 6.5 for soil).. if you mix the two solutions will the PH balance out and still be around 6.5 ??

There are variables(ie something allready in supply water) but good nutes with good buffers should stay stable in a cool dark place for a week.

Again more variables but they tend to balance each other out when mixed but may buffer out of range.

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