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Samenvatting Scheikunde H4

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Scheikunde




Door: Benthe Piena
Vwo 6

, 4.1 Ionen in de bodem
Je hebt enkelvoudige ionen en samengestelde ionen.

Van zouten met enkelvoudige ionen en van samengestelde ionen kun je de
verhoudingsformule opstellen.

Positieve samengestelde ionen
1+ NH4+ Ammoniumion
Negatieve samengestelde ionen
1- OH- Hydroxide-ion
NO3- Nitraation
NO2- Nitrietion
HCO3- Waterstofcarbonaation
CH3COO- Ethanoaation, acetaation
H2PO4- Diwaterstoffosfaation
2- CO32- Carbonaation
SO42- Sulfaation
SO32- Sulfietion
HPO42- Waterstoffosfaation
3- PO43- Fosfaation

Stappenplan zoutformule opstellen van zout met samengestelde ionen:

1. Noteer de formules van de ionen.
2. Bepaal de verhouding van de ionen, zodat het zout elektrisch neutraal
is.
3. Schrijf de verhoudingsformule op.
- Het samengestelde ion schrijf je tussenhaakje als de index twee of
- meer is waarbij de index een underscript is.

4.2 Oplosbaarheid van zouten
Een oplossing van een goed oplosbaar zout heeft een grotere geleidbaarheid
dan die van een slecht oplosbaar zout.
- Een zout geleidt elektrische stroom als de ionen vrij door het water
- bewegen.

De ionen uit het ionrooster raken tijdens het oplossen los van elkaar.

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