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A sample of hard water contains about 8.7 X 103 M Ca". A soluble uoridecontaining salt, such as NaF, is added to "uoridate" the water (to...

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A sample of hard water contains about 8.7 X 10—3 M Ca“. A soluble fluoride—containing salt, such as NaF, is added to "fluoridate" the water (to aid in the prevention of dental
cavities). What is the maximum concentration of F7 that can be present without precipitating Can 7 Ksp = 5.3 x 10—11 Dietary sources of fluoride ion. Adding fluoride ion to drinking water (or toothpaste) prevents the formation of dental cavitiesi [Film = l— M

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