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der pH-Wert in Laken
#2
Hi,

>1. wie weit ist es üblich, das bei gleicher

Rezeptur der pH-Wert in der Anwendungslake schwankt?


Gegenfrage:

wird vor der pH-Wertmessung das pH-Meter ordnungsgemäß kalibriert (bei pH 4,01 und pH 7)

?
Wird die Temperatur der Lake berücksichtigt ? (also vorm Messen die Temperatur der Lake

bestimmen und das pH-Meter auf GENAU DIESE Temperatur einstellen). Und

zuletzt: Sind die Inhaltstoffe in der Lake homogen verteilt?
Falls nein,

liegts mit den Schwankungen vielleicht daran.

Die Lake wird ja im wesentlichjen aus

Kochsalz (NaCl) und Wasser bestehen. Kochsalz (als Salz einer starken Säure und einer

starken Base [NaOH + HCl]) wird den pH-Wert nicht verändern. Für die Lake wird ja

Leitungswasser und kein Aqua dest. verwendet. Habt Ihr mal die pH-Werte des Leitungswassers

gemessen? Schwanken die auch?


> 2. Üblicherweise

schwankt der pH-Wert von Charge zu Charge um ca. 0,2 bis 0,3. Ist das im guten / üblichen

Bereich


da fehlen mir Erfahrungswerte. Wenn das Leitungswasser

schon beim pH-Wert schwankt. o.k. ansonsten würde es ja heißen, dass die Zusammensetzung

doch nicht so identisch ist <!-- sWink --><img src="{SMILIES_PATH}/icon_wink.gif" alt="Wink" title="Wink" /><!-- sWink --> )


> > 3. wie

wirk sich Phosphat in der der lake aus? Hebt oder senkt die anwesendheit von Phosphat den

pH-Wert?


kommt drauf an welches Phosphat <!-- sWink --><img src="{SMILIES_PATH}/icon_wink.gif" alt="Wink" title="Wink" /><!-- sWink --> (ist aber nur ne

generelle Information)
Phosphat ( PO4 3- ) reagiert z.B. basisch
Dihydrogenphosphat

(H2PO4 - ) sauer
Wieviel wird denn zugesetzt ?

Gruß
Gunnar <!-- Icon_cool --><img src="{SMILIES_PATH}/icon_cool.gif" alt="8)" title="Cool" /><!-- Icon_cool -->
  Zitieren


Nachrichten in diesem Thema
der pH-Wert in Laken - von Ariane - 28.07.2006, 11:26
[Kein Betreff] - von Kyylshrunk - 28.07.2006, 12:15
[Kein Betreff] - von Ariane - 28.07.2006, 15:17
[Kein Betreff] - von Kyylshrunk - 28.07.2006, 18:47
[Kein Betreff] - von Ariane - 05.08.2006, 09:43
[Kein Betreff] - von Kyylshrunk - 08.08.2006, 12:08
[Kein Betreff] - von Ariane - 08.08.2006, 13:27

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