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The maximum amount of lead allowed in drinking water is 0.015 mg/kg of water. Express this...
1) The maximum allowable concentration of lead in drinking water is 9.0 ppb. (a) Calculate the molarity of lead in a 9.0-ppb solution. What assumption did you have tomake in your calculation? (b) How many grams of lead are in a swimming pool containing 9.0 ppb lead in 60 m3 of water?
The maximum allowed nitrite (NO2-) in drinking water is listed as 1 mg/L; for nitrate (NO3-) it is 10 mg/L. The standard half-cell potential for the nitrate <-> nitrite reaction is Eo = 0.881 V. What is the pE of a water body whose pH is 5.4 that is just at the limits of allowed nitrite and nitrate?
How would you express the concentration level of drinking water 0.002 mg/L in ppm and ppb?
The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water. The EPA has set a maximum concentration of TCE in drinking water at 5 ppb. Consuming water on a regular basis that contains higher concentrations can lead to cancer. (a) What is the ppb concentration in a 200.0−L (200.0 kg) sample of water that contains 0.15 mg TCE?
Flint, Michigan faces a serious water contamination crisis with high levels of lead (Pb) found in the water. The EPA has a limit of 0.015 mg/L. Express this concentration in units of ppb. Assume the water has a density of 1 g/mL.
A 70-kg individual drinks 2 L/day of water containing 0.015 mg/L of tetrachloroethylene for 20 years. (a) Find the hazard quotient for this exposure. (b) Find the cancer risk. (c) If the individual drinks this water for 30 years instead of just 20, recomputed the hazard quotient and the cancer risk. A man works in an Aluminum smelter for 10 years. The drinking water in the smelter contains 0.015 mg/L arsenic and 0.80 mg/L methylene chloride. His only exposure to...
20/27OBLEM: Suppose drinking water contains 1 mg/l of toluene and 0.01 mg/l of tetrachloroethylene (C2C4). A 70 kg adult drinks 2 t/day of this water for 10 years. a) Assess HR and evaluate HR. Was this a safe level of exposure? b) C2C4 is a carcinogen. What would be the carcinogenic risk faced by a person drinking it. Would it be less than 106 (goal)? RfDtoluene 0.2 mg/kg.day RfDc:ci 0.0 mg/kg.day PFc.c 5.1 x 10-2 (mg/kg-day) 20/27OBLEM: Suppose drinking water...
A 1435 mL sample of drinking water was found to contain 67.0 mg of lead. Calculate the concentration of lead in milligrams per liter. lead concentration: m g/L Calculate the percent mass per volume, % (m/v), of a dextrose solution containing 8.00 g of dextrose in 2.00 x 10 mL of solution. Note that mass is not technically the same as weight, but the abbreviation % (w/v) is often used interchangeably with % (m/v). percent mass per volume concentration: %...
Your test your tap water and find that it contains 45 mg of lead in 1750 mL of solution. Represent this concentration in a.) ppm (mg/L) b.) ppb (ug/L) Include 3 significant figures and units in your answers
Path:p QUESTION 12 A medication label contains the following information: Vistari hydroxyzine hydrochloride 25 mg/ml 10 ml Calculate the amount needed for the dose. Order: hydroxyzine HCI 50 mg IM stat Give: TT T Arial 3 (12pt) T-E- E- -225 20 000 F4 $ | % ^