Question 1

You make a solution of fuming nitric acid (HNO₃, 63.02 g/mol), which has a density of 1.50 g/mL and contains 90.0% HNO₃ by mass.Calculate the theoretical molarity of water in this solution.

Accepted Answer

First, calculate the mass of HNO3 in 1 L of solution: 1.50 g/mL * 1000 mL = 1500 g. Then, find the mass of HNO3: 1500 g * 0.90 = 1350 g. The mass of water is 150 g (1500 g - 1350 g). Convert the mass of water to moles: 150 g / 18.02 g/mol = 8.32 moles. Thus, the molarity of water is 8.32 M.

Question 2

How many grams of glucose (C₆H₁₂O₆, 180.16 g/mol) would be required to prepare 2.50 L of a 0.278 M glucose solution that could be used in an IV bag?

Accepted Answer

E

Question 3

If there are 0.505 g of NaCl (58.44 g/mol) left in a beaker that originally contained 75.0 mL of saltwater, what must have been the concentration of the original solution?

Accepted Answer

D

Question 4

What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH?

Accepted Answer

The answer of What volume of 2.50 M NaOH (40.00...

Question 5

A homogeneous mixture of two or more substances is called

Accepted Answer

A homogeneous mixture of two or more substances is defined as a solution.

Question 6

Assuming that the density of water is 1.00 g/mL, how many moles of water are there in a liter of water?

Accepted Answer

The density of water is 1.00 g/mL, which means 1 liter (1000 mL) of water has a mass of 1000 g. The molar mass of water (H2O) is approximately 18.015 g/mol. To find the number of moles, divide the mass by the molar mass: 1000 g / 18.015 g/mol = 55.5 moles, which is approximately 55.6 moles.

Question 7

A homogeneous mixture containing sodium, potassium, calcium, and chloride ions dissolved in water is

Accepted Answer

The mixture is an aqueous solution because it consists of ions dissolved in water.

Question 8

How many grams of solid potassium chlorate (KClO₃, 122.55 g/mol) are needed to make 150 mL of 0.50 M solution?

Accepted Answer

To find the mass of KClO3 needed, use the formula: mass = molarity × volume (L) × molar mass. Here, 0.50 M × 0.150 L × 122.55 g/mol = 9.2 g.

Question 9

If 120 g of NaOH (40.00 g/mol) were used to prepare 500.0 mL of solution, what would the concentration be?

Accepted Answer

The answer of If 120 g of NaOH (40.00 g/mol)...

Question 10

Molarity, M, is defined as

Accepted Answer

Molarity is defined as the number of moles of solute dissolved in one liter of solution, not just solvent.

Question 11

Lead levels in drinking water should be no higher than 15 ppb.What is this in mol/L? Assume the density of drinking water is 1.0 g/mL.

Accepted Answer

15 ppb Pb = 15 µg Pb/L = 15 ng Pb/mLConvert ng to g:15 ng Pb/mL = 15 × 10−9 g Pb/mLConvert g to mol:15 × 10−9 g Pb/mL × (1 mol Pb/207.2 g Pb) = 7.2 × 10−11 mol Pb/mLConvert mL to L:7.2 × 10−11 mol Pb/mL × (1000 mL/L) = 7.2 × 10−8 mol Pb/LTherefore, the lead level in drinking water is 7.2 × 10−8 mol/L.

Question 12

Concentrated sulfuric acid contains 4 g of water for every 100 g of solution.The solvent is

Accepted Answer

The solvent in a solution is the component present in the largest amount. In this case, since the solution is described as "concentrated sulfuric acid" and contains only 4 g of water for every 100 g of solution, sulfuric acid is the major component and thus the solvent.

Question 13

A salt solution is added to a marine aquarium.What mass of sodium chloride (NaCl, 58.44 g/mol) is needed to produce 250.0 mL of a solution that has a concentration of 50.0 mM ?

Accepted Answer

The answer of A salt solution is added to a...

Question 14

Calculate parts per million Br^- in a sample of seawater that is 0.865 mM Br^- with a density of 1.025 g/mL.

Accepted Answer

The answer of Calculate parts per million Br^- in a...

Question 15

Determine the molar concentration of the lead(II) ion in a 26.0 ppb aqueous solution of lead(II) nitrate [Pb(NO₃)₂, 331.22 g/mol].Assume that the density of the solution is 0.998 g/mL.

Accepted Answer

The answer of Determine the molar concentration of the lead(II)...

Question 16

The proof of liquor is defined as two times the percent ethanol (CH₃CH₂OH) it contains by volume.If vodka is 80 proof, what is the solvent in vodka?

Accepted Answer

Water is the solvent in vodka, as it is the component present in the greatest amount, with ethanol being the solute.

Question 17

Which of the following represents the maximum mercury levels in drinking water, which is approximately 2 ppb? Assume the density of drinking water is 1 g/mL.

Accepted Answer

To find the concentration of mercury in drinking water in nM (nanomolar), we first convert 2 ppb (parts per billion) to a concentration in molarity (M). 1 ppb of a substance is equivalent to 1 μg/L. Therefore, 2 ppb is 2 μg/L. The molar mass of mercury (Hg) is approximately 200.59 g/mol. Thus, the concentration in molarity is calculated as follows: (2 μg/L) / (200.59 g/mol) = 2 x 10^-3 mg/L / 200.59 g/mol = 1 x 10^-5 M = 10^-2 mM = 10 nM.

Question 18

Determine the molar concentration of ethanol (CH₃CH₂OH, 46.08 g/mol) in a wine that is 14% ethanol by mass.The density of this wine is 0.93 g/cm³.

Accepted Answer

The answer of Determine the molar concentration of ethanol (CH₃CH₂OH,...

Question 19

A concentrated aqueous hydrofluoric acid solution has a density of 1.15 g/mL and is 48.0% by mass HF (20.01 g/mol).Determine the molar concentration of this solution.

Accepted Answer

The molar concentration (M) of the solution can be calculated by dividing the moles of solute (HF in this case) by the volume of the solution in liters. First, we find the mass of HF in 1000 mL (or 1 L) of solution, given that the solution is 48.0% HF by mass and has a density of 1.15 g/mL. The mass of the solution per liter is 1150 g (since 1 mL = 1 g and we have 1000 mL), and 48.0% of this mass is HF: $1150 g \times 0.48 = 552 g$ of HF. To find the moles of HF, we divide the mass of HF by its molar mass: $552 g \div 20.01 g/mol = 27.6$ moles. Therefore, the molar concentration is 27.6 M.

Question 20

How many grams of sodium chloride (NaCl, 58.44 g/mol) are needed to make up 250.mL of a solution that is 2.00 M ?

Accepted Answer

To find the grams of NaCl needed, use the formula: moles = molarity × volume (in liters). For a 2.00 M solution in 0.250 L, moles = 2.00 × 0.250 = 0.500 moles. Then, convert moles to grams: 0.500 moles × 58.44 g/mol = 29.22 g, which rounds to 29.2 g.

Quiz 8: Aqueous Solutions Chemistry of the Hydrosphere

You make a solution of fuming nitric acid (HNO₃, 63.02 g/mol) , which has a density of 1.50 g/mL and contains 90.0% HNO₃ by mass.Calculate the theoretical molarity of water in this solution.

How many grams of glucose (C₆H₁₂O₆, 180.16 g/mol) would be required to prepare 2.50 L of a 0.278 M glucose solution that could be used in an IV bag?

If there are 0.505 g of NaCl (58.44 g/mol) left in a beaker that originally contained 75.0 mL of saltwater, what must have been the concentration of the original solution?

What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH?

A homogeneous mixture of two or more substances is called

Assuming that the density of water is 1.00 g/mL, how many moles of water are there in a liter of water?

A homogeneous mixture containing sodium, potassium, calcium, and chloride ions dissolved in water is

How many grams of solid potassium chlorate (KClO₃, 122.55 g/mol) are needed to make 150 mL of 0.50 M solution?

If 120 g of NaOH (40.00 g/mol) were used to prepare 500.0 mL of solution, what would the concentration be?

Molarity, M, is defined as

Lead levels in drinking water should be no higher than 15 ppb.What is this in mol/L? Assume the density of drinking water is 1.0 g/mL.

Concentrated sulfuric acid contains 4 g of water for every 100 g of solution.The solvent is

A salt solution is added to a marine aquarium.What mass of sodium chloride (NaCl, 58.44 g/mol) is needed to produce 250.0 mL of a solution that has a concentration of 50.0 mM ?

Calculate parts per million Br^- in a sample of seawater that is 0.865 mM Br^- with a density of 1.025 g/mL.

Determine the molar concentration of the lead(II) ion in a 26.0 ppb aqueous solution of lead(II) nitrate [Pb(NO₃) ₂, 331.22 g/mol].Assume that the density of the solution is 0.998 g/mL.

The proof of liquor is defined as two times the percent ethanol (CH₃CH₂OH) it contains by volume.If vodka is 80 proof, what is the solvent in vodka?

Which of the following represents the maximum mercury levels in drinking water, which is approximately 2 ppb? Assume the density of drinking water is 1 g/mL.

Determine the molar concentration of ethanol (CH₃CH₂OH, 46.08 g/mol) in a wine that is 14% ethanol by mass.The density of this wine is 0.93 g/cm³.

A concentrated aqueous hydrofluoric acid solution has a density of 1.15 g/mL and is 48.0% by mass HF (20.01 g/mol) .Determine the molar concentration of this solution.

How many grams of sodium chloride (NaCl, 58.44 g/mol) are needed to make up 250.mL of a solution that is 2.00 M ?

Quiz 8: Aqueous Solutions Chemistry of the Hydrosphere

You make a solution of fuming nitric acid (HNO3, 63.02 g/mol) , which has a density of 1.50 g/mL and contains 90.0% HNO3 by mass.Calculate the theoretical molarity of water in this solution.

How many grams of glucose (C6H12O6, 180.16 g/mol) would be required to prepare 2.50 L of a 0.278 M glucose solution that could be used in an IV bag?

If there are 0.505 g of NaCl (58.44 g/mol) left in a beaker that originally contained 75.0 mL of saltwater, what must have been the concentration of the original solution?

What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH?

A homogeneous mixture of two or more substances is called

Assuming that the density of water is 1.00 g/mL, how many moles of water are there in a liter of water?

A homogeneous mixture containing sodium, potassium, calcium, and chloride ions dissolved in water is

How many grams of solid potassium chlorate (KClO3, 122.55 g/mol) are needed to make 150 mL of 0.50 M solution?

If 120 g of NaOH (40.00 g/mol) were used to prepare 500.0 mL of solution, what would the concentration be?

Molarity, M, is defined as

Lead levels in drinking water should be no higher than 15 ppb.What is this in mol/L? Assume the density of drinking water is 1.0 g/mL.

Concentrated sulfuric acid contains 4 g of water for every 100 g of solution.The solvent is

A salt solution is added to a marine aquarium.What mass of sodium chloride (NaCl, 58.44 g/mol) is needed to produce 250.0 mL of a solution that has a concentration of 50.0 mM ?

Calculate parts per million Br- in a sample of seawater that is 0.865 mM Br- with a density of 1.025 g/mL.

Determine the molar concentration of the lead(II) ion in a 26.0 ppb aqueous solution of lead(II) nitrate [Pb(NO3) 2, 331.22 g/mol].Assume that the density of the solution is 0.998 g/mL.

The proof of liquor is defined as two times the percent ethanol (CH3CH2OH) it contains by volume.If vodka is 80 proof, what is the solvent in vodka?

Which of the following represents the maximum mercury levels in drinking water, which is approximately 2 ppb? Assume the density of drinking water is 1 g/mL.

Determine the molar concentration of ethanol (CH3CH2OH, 46.08 g/mol) in a wine that is 14% ethanol by mass.The density of this wine is 0.93 g/cm3.

A concentrated aqueous hydrofluoric acid solution has a density of 1.15 g/mL and is 48.0% by mass HF (20.01 g/mol) .Determine the molar concentration of this solution.

How many grams of sodium chloride (NaCl, 58.44 g/mol) are needed to make up 250.mL of a solution that is 2.00 M ?

You make a solution of fuming nitric acid (HNO₃, 63.02 g/mol) , which has a density of 1.50 g/mL and contains 90.0% HNO₃ by mass.Calculate the theoretical molarity of water in this solution.

How many grams of glucose (C₆H₁₂O₆, 180.16 g/mol) would be required to prepare 2.50 L of a 0.278 M glucose solution that could be used in an IV bag?

How many grams of solid potassium chlorate (KClO₃, 122.55 g/mol) are needed to make 150 mL of 0.50 M solution?

Calculate parts per million Br^- in a sample of seawater that is 0.865 mM Br^- with a density of 1.025 g/mL.

Determine the molar concentration of the lead(II) ion in a 26.0 ppb aqueous solution of lead(II) nitrate [Pb(NO₃) ₂, 331.22 g/mol].Assume that the density of the solution is 0.998 g/mL.

The proof of liquor is defined as two times the percent ethanol (CH₃CH₂OH) it contains by volume.If vodka is 80 proof, what is the solvent in vodka?

Determine the molar concentration of ethanol (CH₃CH₂OH, 46.08 g/mol) in a wine that is 14% ethanol by mass.The density of this wine is 0.93 g/cm³.