Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH...

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Sodium fluoride is added to many municipal water supplies toreduce tooth decay. Calculate the pH of a 0.00307 M solution ofNaF, given that the K_a of HF= 6.80 x 10^-4 at25 degree celcius.

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Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â NaF -------> Na^+Â Â + F^-

Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.00307MÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0.00307M

Â Â Â Â Â Â Â Â Â Â Â Â F^- + H2O --------> HF + OH^-

IÂ Â Â Â Â Â Â Â Â Â 0.00307Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â +x

EÂ Â Â Â Â Â Â 0.00307-xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â +xÂ Â Â Â +x

KbÂ Â = Kw/Ka

Â Â Â Â Â Â Â Â Â = 1*10^-14/6.8*10^-4

Â Â Â Â Â Â Â Â Â Â Â = 1.47*10^-11

Â Â Â Â KbÂ Â = [HF]{OH-]/[HF]

Â Â Â Â Â 1.47*10^-11Â Â Â = x*x/0.00307-x

Â Â Â 1.47*10^-11 *(0.00307-x) = x²

Â Â Â Â Â Â Â Â Â Â x = 2.12*10^-7

Â Â Â Â Â [OH-]Â Â = xÂ Â = 2.12*10^-7 M

Â Â Â Â POHÂ Â = -log[OH-]

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = -log2.12*10^-7

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 6.6736

Â Â Â Â Â PHÂ Â Â = 14-POH

Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 14-6.6736Â Â = 7.3264

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Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH...

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Sodium fluoride is added to many municipal water supplies toreduce tooth decay. Calculate the pH of a 0.00307 M solution ofNaF, given that the K_a of HF= 6.80 x 10^-4 at25 degree celcius.

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Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH...

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Chemistry

Sodium fluoride is added to many municipal water supplies toreduce tooth decay. Calculate the pH of a 0.00307 M solution ofNaF, given that the Ka of HF= 6.80 x 10-4 at25 degree celcius.

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Sodium fluoride is added to many municipal water supplies toreduce tooth decay. Calculate the pH of a 0.00307 M solution ofNaF, given that the K_a of HF= 6.80 x 10^-4 at25 degree celcius.