Solutions Questions and Answers

Physical Chemistry
SolutionsA 27.46 mL solution of weak acid is titrated with 0.0859 M NaOH. It requires 75.15 mL of the NaOH
titrant to reach the equivalence point. Based on the titration curve, it is determined that K₂ = 9.5 x 10-
10 for the weak acid. Based on this information, what was the pH after only 39.28 mL of NaOH was
added?
Write your answer to 2 decimal places (ie. 1.23 or 12.34).

Physical Chemistry
SolutionsNitrogen gas has a Henry's law constant of 8.42x107 M/mmHg at 20.0 °C when dissolving in water. If the total pressure of gas (N₂ gas plus water vapor) over water is 1.00 atm, what is the concentration of N₂ in the water in grams per milliliter? Pressure of the water vapor at 20.0 °C = 17.5 mmHg. g/mL

Physical Chemistry
SolutionsAt a certain temperature, lead (II) chloride, PbCl2, has a value of Ksp = 9.0 x 10*-5. At this temperature, what is the molar solubility of PbCl2 in the presence of 0.121 M CaCl2? Report your answer to two significant figures (i.e. 1.2E-5M).

Physical Chemistry
SolutionsThis question has multiple parts. Work all the parts to get the most points.
a Calculate the mass in grams of solute required to prepare 855.0 mL of 5.00 M NH4Cl solution.
b Calculate the mass in grams of solute required to prepare 2.50 L of 0.700 M KCI solution.
c Calculate the mass in grams of solute required to prepare 278 mL of 0.400 M Na2SO4 solution.

Physical Chemistry
SolutionsLiquids which are mutually miscible possess intermolecular forces of similar type and magnitude.
True
False


Physical Chemistry
SolutionsHow many moles of O₂ are produced when 0.235 moles of KCIO3 decompose according to
the equation 2KCIO3 --> 2KCI + 3O₂?

Physical Chemistry
SolutionsWhat is the gram per ml percentage of a 2M HCl solution
12.4 percentage
10 percentage
4.21 percentage
7.29 percentage

Physical Chemistry
SolutionsSelect all the concentration units below that are temperature-independent. There may be more than one correct answer.
mole fraction
molality (m)
molarity
percent by mass
percent by volume

Physical Chemistry
SolutionsBased on the moles you have for Salicylic Acid and Acetic Anhydride, determine
which one was the limiting Reagent.

Physical Chemistry
Solutions2NaOH+ FeCl₂ --> 2NaCl + Fe(OH)2
If 13.5 g of sodium hydroxide reacts with an excess of iron (II) chloride according to the
equation above, how much Fe(OH)2 will be produced?
19.72 g
15.17 g
9.86 g
30.33 g

Physical Chemistry
SolutionsArrange these aqueous solutions in order of decreasing boiling points:
Highest Boiling Point
0.100 m Mg(NO3)2
0.200 methylene glycol, C₂H6O2
0.175 m LiCl

Physical Chemistry
Solutions100 mL of a 13 1/2% solution has been
prepared, how many mililiters of solution are
in 13 1/2 strength solution?

Physical Chemistry
SolutionsA solution containing 12.9 g of MgCl, is dissolved in water to make a 0.54 L solution.
a. What is the molarity of the solution? Show your work! (Hint: Find the moles first!)
b. Describe how decreasing the volume would affect the molarity of the solution.

Physical Chemistry
SolutionsHere is a molecular equation: H₂CO3(aq) + 2 KOH(aq) → 2 H₂O(l) + K₂CO3(aq)
Which of the choices below is the right side of the complete ionic equation for this
same reaction?

Physical Chemistry
SolutionsA solution is made up of 86.3g ethylene glycol (C₂H6O₂) in 143.2g of water. Calculate the
freezing point of this solution (ΔTf = m X Kf, For water Kf = 1.86 °C/m)