Tooth enamel is largely hydroxyapatite [Ca 3 (PO 4 ) 3 OH]. When it dissolves in water (a process called demineralization ), it dissociates as follows: Ca 5 ( PO 4 ) 3 O H → 5Ca 2+ +3PO 4 3 − + OH − The reverse process, called remineralization , is the body’s natural defense against tooth decay. Acids produced from food remove the OH − ions and thereby weaken the enamel layer. Most toothpastes contain a fluoride compound such as NaF or SnF 2 . What is the function of these compounds in preventing tooth decay?
Tooth enamel is largely hydroxyapatite [Ca 3 (PO 4 ) 3 OH]. When it dissolves in water (a process called demineralization ), it dissociates as follows: Ca 5 ( PO 4 ) 3 O H → 5Ca 2+ +3PO 4 3 − + OH − The reverse process, called remineralization , is the body’s natural defense against tooth decay. Acids produced from food remove the OH − ions and thereby weaken the enamel layer. Most toothpastes contain a fluoride compound such as NaF or SnF 2 . What is the function of these compounds in preventing tooth decay?
Solution Summary: The author explains that the function of NaF and Sn
Tooth enamel is largely hydroxyapatite [Ca3(PO4)3OH]. When it dissolves in water (a process called demineralization), it dissociates as follows:
Ca
5
(
PO
4
)
3
O
H
→
5Ca
2+
+3PO
4
3
−
+
OH
−
The reverse process, called remineralization, is the body’s natural defense against tooth decay. Acids produced from food remove the OH− ions and thereby weaken the enamel layer. Most toothpastes contain a fluoride compound such as NaF or SnF2. What is the function of these compounds in preventing tooth decay?
In one electrode: Pt, H2(1 atm) | H+(a=1), the interchange current density at 298K is 0.79 mA·cm-2. If the voltage difference of the interface is +5 mV. What will be the correct intensity at pH = 2?. Maximum transfer voltage and beta = 0.5.
In a Pt electrode, H2(1 atm) | H+(a=1), the interchange current density of an electrode is 0.79 mA cm-2. ¿Qué corriente flow across the electrode of área 5 cm2 when the difference in potential of the interface is +5 mV?.
If the current voltage is n = 0.14 V, indicate which of the 2 voltage
formulas of the ley of Tafel must be applied
i
a
a) == exp (1-B).
xp[(1 - ß³):
Fn
Fn
a
b) == exp B
RT
RT
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell