Testeur Ph Hanna : Etalonnage
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8:14
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Bonjour pourquoi 2 solutions ph 7 et ph 4 .
Une seul ne suffi pas , pour savoir le ph de l'eau .
Je comprend pas pourquoi 2 solutions sa donne quoi en + merci de me répondre je souhaite tester
toto6311 6 months ago