Biology

Biology, 06.07.2019 14:30, thechameleonnaire

Which substance, when added to public water, to prevent tooth decay? sodium halide chloride fluoride

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Chemistry, 11.07.2019 18:30, rosehayden21

The american dental association recommends that an adult female should consume 3.0 mg of fluoride (f−) per day to prevent tooth decay. part a if the fluoride is consumed as sodium fluoride (45.24% f), what amount of sodium fluoride contains the recommended amount of fluoride?

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Chemistry, 11.07.2019 20:30, smortandsons

Fluoride is known to prevent tooth decay so it is added to the city water supply for drinking. a medium sized city is populated with 150,000 people. each person appeoximately 660.0 l of water each day. how many kg of naf must be added to the water supply each year to have the required fluoride concentration of 1.0 ppm? how to get the answer of 8.0×10^4 kgnaf/year?

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Chemistry, 12.08.2019 23:30, tlecuyer

Fluoridation is the process of adding fluorine compounds to drinking water to fight tooth decay. a concentration of 1 ppm of fluorine is sufficient for the purpose (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water). the compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gal. what percent of the sodium fluoride is "wasted" if each person uses only 6.0 l of water a day for drinking and cooking (sodium fluoride is 45.0 percent fluorine by mass; 1 gal= 3.79 l; 1 year =365 days; 1 ton =2000 lb; 1 lb =453.6g; density of water =1.0 g/ml)?

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Chemistry, 14.08.2019 08:20, 21marmong

Fluoride ion is poisonous in relatively low amounts: 0.2 g of f- per 70 kg of body weight can cause death. nevertheless, in order to prevent tooth decay, f- ions are added to drinking water at a concentration of 1 mg of f- ion per l of water. how many liters of ﬂuoridated drinking water would a 70-kg person have to consume in one day to reach this toxic level? how many kilograms of sodium fluoride would be needed to treat a 8.5 x107-gal reservoir?

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