The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of a heavy metal is 5 ppm. What is the LD 50 for the heavy metal in ppt and ppb?

Q: What mass of cesium bromide must be added to 0.500 L of water (d=1.00 g/mL) to produce a 0.817 m…

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Q: The concentration this concentration of Tetrachloroethylene in water is 3 mg/L. Express in mol/1,…

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Q: The binary compound MX2 has a solubility of 0.014 g/L and a molar mass, ℳ = 114.68 g/mol. Calculate…

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Q: What is the ppm concentration of a 1.50-L solution that contains 0.44 mg Cd²+? 0.83 ppm 0.29 ppm…

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Q: The lethal dosage of potassium cyanide in rats is 12mg per kilogram body weight. What is this…

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Q: Dioxin is considered to be poisonous in concentrations above 2 ppb. If a lake containing 1 × 107 L…

A: Poisonous concentration = 2 ppb above We know 1ppb = 10-6 g/L Find concentration of dioxin (in g/L):…

Q: How many parts per million (ppm) is 1mg/L? O 1ppm O 10ppm O100ppm 1000ppm

A: Given  Concentration = 1 mg/ L  ppm  = ?

Q: The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in…

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Q: Šuppose you have an ionic compound that has a solubility of 35g of MX per 100g water at 20°C. How…

A: Solubility is the amount of solute added in a given amount of solvent to attain saturation.

Q: A sample of seawater contains 1.9 g of calcium ions in 5364 kg of solution. What is the calcium ion…

A: Given  Mass of solute (calcium ions) = 1.9 g Mass of solution = 5364 kg = 5346×103 g Concentration…

Q: How many grams of CaCO3 (FM 100.086) are needed to prepare 150.0 mL of an 80.0 ppm aqueous Ca²+…

A: The mass of solute in mg present in a one-liter solution is known as ppm (parts per million)…

Q: The Earth’s oceans have a salinity of 35. What is the concentration of dissolved salts in seawater…

A: Given that salinity of earth’s ocean is 35. Thus, mass of salt in one kilogram of water is 35 g and…

Q: Pure

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Q: A 42.2 g sample of ground water is found to have a lead concentration of 17.77 ppm. Calculate the…

A: Mass of solute present in 106 or 1 million mass of solution is known as ppm concentration.

Q: If a 750 mL sample of drinking water has lead concentration of 28 ppm, how many grams of lead are in…

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Q: The concentration of a gas in air is 0.694%. Express this value in ppm

A: Using the formula 1 % = 10000 ppm So 0.694 % = 0.694 * 10000 = 6940 ppm

Q: A 0.25 g sample of an unknown solid is dissolved in 8.85 g of cyclohexane. The change in the…

A: We can calculate the molality of the solute in the solution by using the relation of depression in…

Q: Fish can tolerate copper ion concentrations up to 8 ppb. Dr. Stone measured her pond water and the…

A: PPB is part per billion is 1 g of substance in 1 billion L of water So, 1 ppb = 10-9 M

Q: What is the molality of the solution that contains 65 g of sucrose (C12H22O11) dissolved in 300g of…

A: Molarity is defined as moles of solute per kg of the solvent.

Q: Which of the following can be used to measure a very small concentration (much less than 1% m/m)?…

A: Given: Mass percent of solute is much less than 1 % (m/m) (assuming its 0.0001 %). Assuming 100 g of…

Q: In 500. g of water at 50 degrees Celsius, approximately what mass of substance C will dissolve?…

A: Given , solubility curves of four substances in 100 grams of water at different temperatures.

Q: Calculate the salinity (as g/kg NaCl) of a table salt solution with density of 1.0513 g/L.

A: Given that -  Density of salt solution = 1.0513 g/L    Now, the salinity of the Salt Solution is the…

Q: A 43.8 g sample of ground water is found to have a lead concentration of 13.31 ppm. Calculate the…

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Q: The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in…

A: The upper limit of chloride according to EPA's secondary standards for contaminants = 250 mg/L…

Q: Data Table Mass of Zn HCI Volume Tinitial Tfinal 0.55 g 100.0 mL 20.0 °C 23.1°C The density of the…

A: Hello. Since your question has multiple parts, we will solve the first question for you. If you want…

Q: Some ionic components of seawater are given in the following table: Cation Wt% Anion Wt% Na 1.06 Cl…

A: ppm concentration is used to express the composition of very dilute solutions, or for the solute…

Q: What is the hardness in water in ppm if there is 500g of CaCO3 in 1 x 10^3mL of water?

A: amount of CaCO3=500g volume of water=1×103 ml Mass of water =density of water ×volume

Q: The minimum level of mercury levels in water considered safe is 1 part per billion (ppb) by weight.…

A: The volume of water is = 8.52 L The concentration of mercury in the water sample is = 0.59 parts per…