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2) The EPA has determined that the maximum safe level of nitrate ion in water is...
Too much chloride ion in drinking water can cause the following undesirable effects: salty taste ....
Too much chloride ion in drinking water can cause the following undesirable effects: salty taste . The EPA's Secondary Maximum Contaminant Level for chloride ion in drinking water is 250 mg/L. (1) If 3.24×104liters of water in a storage tank contains 31.2 grams of Cl-, what is the contaminant level in ppm? ______ ppm Assume that the density of the impure water is 1.00 g/mL. (2) Is this level acceptable based on EPA guidelines? _________ acceptable or not acceptable AND...
14. The EPA maximum safe limit for arsenic exposure is 50 ppb. If a 25 mL...
14. The EPA maximum safe limit for arsenic exposure is 50 ppb. If a 25 mL water sample was found to contain 50 ng of arsenic, would this water be deemed safe? Assume the density of water to be 1 g/mL.
The Safe Drinking Water Quality Standard for nitrate nitrogen (NO3--N) is 10.0 mg/L. Convert this into...
The Safe Drinking Water Quality Standard for nitrate nitrogen (NO3--N) is 10.0 mg/L. Convert this into nitrate (NO3-) in ppm, mmol/L, and normality (N). (Given: N=14, O=16) The highest maximum one-hour ozone (O3; molecular weight = 48) concentration in Houston during 1999-2001 was 175 ppb. Convert this into mg/m3 at STP. The National Ambient Air Quality Standards for 1-hr O3 is 155 mg/m3. (Given: mg/m3 = ppm*MW/22.4).
The maximum contaminant level (MCL) set by EPA of Hg in drinking water is 0.0020 mg/L....
The maximum contaminant level (MCL) set by EPA of Hg in drinking water is 0.0020 mg/L. A farmer recently dug a new well for his property. He sends a 16.0 mL sample of the well water to the EPA to be tested for the presence of Hg. What is the maximum amount of Hg (in micrograms) that can be present in this 16.0 mL sample based on its maximum contaminant level (MCL) ?
1) According to a health report, the world wide average silver concentrations in natural waters are...
1) According to a health report, the world wide average silver concentrations in natural waters are 0.2–0.3 mcg/liter. In the US, concentrations can reach 5 mcg/liter. Determine the concentration in ppb (nearest tenth) for a water sample that contains 4.5 mcg per 0.5 liter. 2) According to the EPA, the maximum allowable concentration of nitrate in drinking water is 0.01 g per liter. What is the ppm concentration (two decimal places) of a water sample that contains 7 mg of...
A chemist samples a river's water to measure the amount of fertilizer runoff from the area...
A chemist samples a river's water to measure the amount of fertilizer runoff from the area farms. In a 0.0580 L sample, the chemist measures 2.00×102 μg of nitrate. Express the concentration of nitrate in parts per million (ppm) and parts per billion (ppb). Assume the density of the river water sample is 1.00 g/mL. concentration: ppm concentration: ppb
: The maximum safe level of bacteria per mL sample of water is 50. Suppose that...
: The maximum safe level of bacteria per mL sample of water is 50. Suppose that 60 samples of water are taken randomly from our water source. For these 60 observations, the average bacteria content is 51.7 bacteria per mL, with a standard deviation of 7 bacteria per mL. Is there reason to believe that the water is unsafe to drink?
The chemical trichloroethylene (TCE) is a colorless liquid found in very low concentration in drinking water....
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?
The mole fraction of nickel(II) acetate, Ni(CH3COO)2, in an aqueous solution is 3.76x102 The percent by...
The mole fraction of nickel(II) acetate, Ni(CH3COO)2, in an aqueous solution is 3.76x102 The percent by mass of nickel(II) acetate in the solution is 0 Submit Answer An aqueous solution is 12.0% by mass ammonia NH3 The mole fraction of ammonia in the solution is Submit Answer Use the References to access important values if needed for this question. EPA regulations for harmful contaminants in drinking water set an upper limit of 4.00x103 mg/L for beryllium. Suppose that your water...
The concentration of Cu2+ ion in a sample of spring water is 5.3 ppm. What mass...
The concentration of Cu2+ ion in a sample of spring water is 5.3 ppm. What mass of Cu2+ ion is present in 6.5 L of this pring water, which has a density of 1.00 g/mL? O 2.6 g 0 0.068 g O 0.034 g O 0.34 g
14. The EPA maximum safe limit for arsenic exposure is 50 ppb. If a 25 mL water sample was found to contain 50 ng of arsenic, would this water be deemed safe? Assume the density of water to be 1 g/mL.
The mole fraction of nickel(II) acetate, Ni(CH3COO)2, in an aqueous solution is 3.76x102 The percent by mass of nickel(II) acetate in the solution is 0 Submit Answer An aqueous solution is 12.0% by mass ammonia NH3 The mole fraction of ammonia in the solution is Submit Answer Use the References to access important values if needed for this question. EPA regulations for harmful contaminants in drinking water set an upper limit of 4.00x103 mg/L for beryllium. Suppose that your water...
The concentration of Cu2+ ion in a sample of spring water is 5.3 ppm. What mass of Cu2+ ion is present in 6.5 L of this pring water, which has a density of 1.00 g/mL? O 2.6 g 0 0.068 g O 0.034 g O 0.34 g
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