Subjects

Sections | |||
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Solutions, Molarity and Intermolecular Forces | 7 mins | 0 completed | Learn |

Henry's Law | 20 mins | 0 completed | Learn Summary |

Calculate Molarity | 27 mins | 0 completed | Learn Summary |

Mass Percent | 10 mins | 0 completed | Learn |

Molality | 15 mins | 0 completed | Learn |

Mole Fraction | 14 mins | 0 completed | Learn |

The Colligative Properties | 45 mins | 0 completed | Learn |

Additional Practice |
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Making Solutions |

Freezing Point Depression |

Colloid |

Additional Guides |
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ppm |

The Freezing Point Depression |

Boiling Point Elevation |

The molarity of a solution is related to the amount of solute dissolved within a solvent.

Concept #1: Molarity is the concentration of a solution represented as moles of solute per liter of solution:

Concept #2: Ionic molarity or osmolarity represents the molarity of dissolved ions in a solution.

Concept #3: Whenever two molarities or two volumes are given for one compound then a dilution is usually involved.

Example #1: Stock hydrochloric acid solution is 21.0% by mass HCl and has a specific gravity of 1.75. What is the molarity of the solution.

Example #2: What is the concentration of nitrate ions in a solution that contains 83.3 g lead (IV) nitrate, Pb(NO_{3})_{4}, dissolved in 700 mL solution? MW of Pb(NO_{3})_{4} is 455.24 g/mol.

Example #3:

How many micrograms of K_{2}CO_{3} are required to prepare 120 mL of 0.325 M K_{2}CO_{3}? MW of K_{2}CO_{3} is 138.21 g/mol.

Example #4:

If 50.0 mL of water is added to 80.0 mL of a 6.00 M solution, what will be the new concentration of the new solution?

Example #5:

To what volume should you dilute 72.93 mL of a 7.505 M LiCl solution so that 23.25 mL contains 2.25 g LiCl? MW of LiCl is 42.392 g/mol.

Example #6: 870.0 g of water contains 0.990 g of sodium phophate, Na_{3}PO_{4}. Determine the concentration of Na_{3}PO_{4} if the density of the solution is 1.10g/mL. MW of NA_{3}PO_{4} is 163.94 g/mol.

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Concept #1: Understanding Molarity

Concept #2: Understanding Osmolarity

Concept #3: Understanding Dilution

Example #1: Calculate Molarity Calculations 1 Example 1

Example #2: Calculate Molarity Calculations 1 Example 2

Example #3: Calculate Molarity Calculations 1 Example 3

Example #4: Calculate Molarity Calculations 2 Example 1

Example #5: Calculate Molarity Calculations 2 Example 2

Example #6: Calculate Molarity Calculations 2 Example 3

Which of the following concentration units would you NOT use when conducting an experiment in which you place a solution in a hot water bath?
a) Molality
b) Mass percent
c) Parts per million
d) Molarity
e) Mole fraction

A concentrated aqueous ammonia solution has a density of 0.90 g/mL and is 28.0% by mass ammonia. Determine the molar concentration of this solution.
a) 15 M
b) 1.5 M
c) 0.032 M
d) 31 M
e) 3.0 M

Concentrated HCl is usually available at a concentration of 37.7 % by mass. What is its molar concentration? (The density of the solution is 1.19 g/mL).

A solution of H2SO4(aq) with a molal concentration of 4.37 m has a density of 1.233 g/mL. What is the molar concentration of this solution?

Which of the following concentration units is temperature dependent?A. mass percentB. ppmC. mole fractionD. molalityE. none of the above.

A solution of H2SO4(aq) with a molal concentration of 3.58 m has a density of 1.200 g/mL.What is the molar concentration of this solution?

What is the concentration of K+ in 0.15 M of K2S ?

Choose the correct statement:
A. Molarity is defined as moles of solute per liter of solvent.
B. % by mass is defined as grams of solute per 100 g of solvent.
C. % by volume is defined as grams of solute per 100 L of solution.
D. Molarity is defined as moles of solute per liter of solution.
E. All of the above.

Use the following graph to determine the molar absorptivity of Bromothymol blue (BTB)? Assume a cuvet with a 14.45 mm diameter was used.

if CaCl2 is dissolved in water, what can be said about the concentration of the Ca 2+ ion?

What is the molarity of a 1.484 m solution of sucrose, C12H22O11? The density of the solution is 1.127 g/mL.A. 1.672 MB. 1.484 MC. 3.400 MD. 1.109 ME. 0.958 M

An aqueous solution of tartaric acid, H2C4H4O6, is 0.278 m and has a density of 1.006 g/mL. What is the molarity of the solution? (molar mass = 150.09 g/mole)

The level of mercury in a stream was suspected to be above the minimum considered safe (1 part per billion by weight). An analysis indicated that the concentration was 0.68 parts per billion. Assume a density of 1.0 g/mL and calculate the molarity of mercury in the stream.

In Canada and the United Kingdom, devices that measure blood glucose levels provide a reading in millimoles per liter. If a measurement of 5.3 mM is observed, what is the concentration of glucose (C6H12O6) in mg/dL?

An automobile antifreeze mixture is made by mixing equal volumes of ethylene glycol (d = 1.114 g/mL; ℳ = 62.07 g/mol) and water (d = 1.00 g/mL) at 20°C. The density of the mixture is 1.070 g/mL. Express the concentration of ethylene glycol as:(c) Molarity

D5W is a solution used as an intravenous fluid. It is a 5.0% by mass solution of dextrose (C6H12O6) in water. If the density of D5W is 1.029 g/mL, calculate the molarity of dextrose in the solution.

Glucose makes up about 0.10% by mass of human blood.What further information would you need to determine the molarity of the solution?

Which of the following solutions will have the most particles present per liter?A. 0.3 M K2SO4B. 0.1 M HNO3C. 0.4 M ethanol C2H5OHD. 0.2 M KBr

Match the missing symbol, name, or unit to the variables in the Beer-Lambert Law.

Find the molarity of a 40.0% by mass aqueous solution of sulfuric acid, H2SO4, for which the density is 1.3057 g/mL.

Baking soda (sodium bicarbonate, NaHCO3) reacts with acids
in foods to form carbonic acid (H2CO3), which in turn decomposes to water and carbon dioxide gas. In a cake batter, the CO2(g) forms bubbles and causes the cake to rise.The density of baking soda is 2.16 g/cm3. Calculate the concentration of lactic acid in one cup of sour milk (assuming the rule of thumb applies), in units of mol/L. (One cup = 236.6 mL = 48 teaspoons).

From the Beer-Lambert Law, A=ebcWhere A is absorbance, e is the molar absorbtivity, b is the path length of the sample - that is, the path length of the cuvette in which the sample is contained, and c is the concentration of the compound in solution.If someone measured a certain absorbance from a solution with a known concentration from the spectrometer, and then measured another solution of the same species at the same wavelength in the same spectrometer, is it possible to calculate the concentration of the second substance (which is currently an unknown)?

Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 81.0% Cu and 19.0% Zn by mass has a density of 8760 kg/m3 .What is the molarity of Zn in the solution?

A student finds a solution of blue dye #2 (another food dye we are not using in this lab) in a 1.0 cm cuvette has a maximum absorbance of 0.572 at 613 nm. The molar extinction coefficient, E, of blue #2 at the same wavelength is 1.21 x 104 M-1 cm-1. Calculate the concentration of this solution.

The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including hexavalent chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K2Cr2O7), what is the maximum permissible molarity of that substance?

A 7.92 mass % aqueous solution of ethylene glycol (HOCH2CH2OH) has a density of 1.15 g/mL. Calculate the molarity of the solution. Give your answer to 2 decimal places.a. 0.36 mb. 0.42 mc. 1.92 md. 1.47 me. 1.21 m

A throat spray is 1.40% by mass phenol, C6H5OH, in water. If the solution has a density of 0.9956 g/mL, calculate the molarity of the solution.

A sodium nitrate solution is 12.5 % NaNO3 by mass and has a density of 1.02 g/mL. Calculate the molarity of the solution.

What is the molarity of the solution 0.0433 m LiF, if the density is 1.10g/mL?

Household hydrogen peroxide is an aqueous solution containing 3.0% hydrogen peroxide by mass. What is the molarity of this solution? (Assume a density of 1.01 g/mL.)

The "free-base" form of cocaine (C17H21NO4) and its protonated hydrochloride form (C17H22ClNO4) are shown
below; the free-base form can be converted to the hydrochloride form with one equivalent of HCl. For clarity, not
all the carbon and hydrogen atoms are shown; each vertex
represents a carbon atom with the appropriate number of
hydrogen atoms so that each carbon makes four bonds to
other atoms.The free-base form of cocaine has a solubility of 1.00 g in 6.70 mL ethanol (CH3CH2OH). Calculate the molarity
of a saturated solution of the free-base form of cocaine in
ethanol.

Hydrochloric acid is usually purchased in a concentrated form that is 37.0% HCl by mass and has a density of 1.20 g/mL.How much concentrated solution would you take to prepare 2.90 L of 0.505 M HCl by mixing with water?

The "free-base" form of cocaine (C17H21NO4) and its protonated hydrochloride form (C17H22ClNO4) are shown
below; the free-base form can be converted to the hydrochloride form with one equivalent of HCl. For clarity, not
all the carbon and hydrogen atoms are shown; each vertex
represents a carbon atom with the appropriate number of
hydrogen atoms so that each carbon makes four bonds to
other atoms.The hydrochloride form of cocaine has a solubility of 1.00 g in 0.400 mL water. Calculate the molarity of a saturated solution of the hydrochloride form of cocaine in water.

What is the molarity of a solution prepared by dissolving 10.7 g Nal in 0.250 L?A) 42.8 B) 0.0714 C) 2.86 x 10-4 D) 0.286 E) none of the above

Solutions of hydrogen in palladium may be formed by exposing Pd metal to H2 gas. The concentration of hydrogen in the palladium depends on the pressure of H2 gas applied, but in a more complex fashion than can be described by Henry’s law. Under certain conditions, 0.94 g of hydrogen gas is dissolved in 215 g of palladium metal (solution density = 10.8 g cm3).(a) Determine the molarity of this solution.

The density of a 21.0% by mass ethylene glycol (C2H6O2 ) solution in water is 1.04 g/mL.Find the molarity of the solution.

The total concentration of dissolved particles in blood is 0.30 M. An intravenous (IV) solution must be isotonic with blood, which means it must have the same concentration.(b) If isotonic saline (NaCl) is used, what is the molarity of the solution?

The total concentration of dissolved particles in blood is 0.30 M. An intravenous (IV) solution must be isotonic with blood, which means it must have the same concentration.(c) If the patient is given 150. mL/h of IV saline for 1.5 h, how many grams of NaCl did she receive?

Nitric acid is usually purchased in a concentrated form that is 70.3% HNO3 by mass and has a density of 1.41 g/mL.How much concentrated solution would you take to prepare 1.15 L of 0.115 M HNO3 by mixing with water?

A cough syrup contains 5.0% ethyl alcohol, C2H5OH, by mass. If the density of the solution is 0.9928 g/mL, determine the molarity of the alcohol in the cough syrup.

A solution is prepared by mixing 631 mL of methanol with 501 mL of water. The molarity of methanol in the resulting solution is 14.29 M. The density of methanol at this temperature is 0.792 g/mL.Calculate the difference in volume between this solution and the total volume of water and methanol that were mixed to prepare the solution.

What is the molarity of NO 3- in each solution?A) 0.190 M KNO3.B) 0.300 M Ca(NO3)2.C) 0.400 M Al(NO3)3.

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