The addition of fluoride to drinking water supplies has been an issue of debate.

Question

The addition of fluoride to drinking water supplies has been an issue of debate. The CDC recommends concentrations between 0.7 to 1.2 mg/L fluoride. A drinking water treatment adds 15 lbm of fluoride to 6 million gallons of water. What is the aqueous concentration of fluoride in mM? Does the treatment plant meet the CDC's recommendation? 5. (20 pts) A typical motorcycle emits about 20 g CO per mile. a) What volume of CO would a 8-mile trip produce after the gas cools to SATP? b) Per meter of distance traveled, what volume of air could be polluted to the air quality standard of 9 ppmv? c) Redo parts a and b under the conditions of a summer day in Tempe. P-1 atm, T = 102 °F. 6. (10 pts) A gaseous mixture contains 5.23 g of chloroform, CHCl3, and 1.66 g of methane, CH4 what partial pressure of chloroform exerted inside a 50.0 mL container at 275°C? what is the pressure of the mixture?

Explanation / Answer

Ans 1

Drinking water treatment adds flouride

Flouride concentration

= (15 lb / 6 x 10^6 gallons) x (0.454kg/lb) x (10^6mg/kg)

= 1.135 mg/gallons x (1gallon/3.785L)

= 0.2998 mg/L = 0.3 mg/L

Flouride concentration in mM

=( 0.2998 mg/L) x (1mmol/18.9984 mg) x (1L/1000 mL)

= 1.578 x 10^-5 mmol/mL

= 1.578 x 10^-5 mM

According to CDC recommendations

Flouride concentration can vary from 0.7 to 1.2 mg/L

Addition of flouride is very low i.e. 0.3 mg/L < 0.7

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.