Because it needs to be almost completely neutralize to dissolve.
I once worked with a 55-gallon load of tube and coil cleaner, and I can tell you this is, although I'd hold said 9.4.
Anyway, hope that helps!
The "TA" of EDTA refers to "TetraAcetic acid", so you hold to make the sodium brackish of these FOUR (tetra) acetic acid moieties. This is done by tallying NaOH, and raising the pH to neutralize adjectives 4 of the acid groups
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