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HEDP (etidronic acid 60%) neutralisation

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Ondex:
Hello!
Please help me with HEDP 60% neutralisation?
I need to obtaint tetrasodium etidronate, salt with high stability.
Ths!!

AWK:
This is a quite simple neutralization reaction with NaOH. Balance this reaction and do stoichiometrical calculations. Someone will check your calculations.

Ondex:
When i do by myself the neutralisation, next i am introduceing trilon b and after increase the ph with naoh to 13.5, the solution is not stable. In some days will see high cristal sediment.
But when i am using tetrasodium etidronate, neutralised in factory condition, by using the same quantity of trilon b and naoh, the sediment will not form.
What is a secred with hedp neutralisation? All the producers tell us that it is a trade secret!!
Thank you!

AWK:
A wrong stoichiometry of neutralization of both reagents. That why I asked you to show calculations.

Ondex:
C2H8O7P2 + 4 NaOH = C2H4Na4O7P2 + 4 H2O
For neutralisation of 20gr of HEDP (60%) i use 9.32 gr of NaOH.
https://www.webqc.org/balance.php?reaction=C2H8O7P2+%2B+NaOH+%3D+C2H4Na4O7P2+%2B+H2O
Something is wrong?

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