Solutions Questions and Answers

Three saturated solutions have been prepared, all at 25°C. • Solution A has 30 g of solid dissolved in 225 mL of water • Solution B has 18.5 g of solid dissolved in 100 mL of water • Solution C has 56 g of solid dissolved in 150 mL of water Which solution is the most concentrated?

A saturated sodium chloride solution is prepared by dissolving 36 g solid NaCl into 100.0 g water at 25 °C. Assuming a solution density of 1.20 g/mL at this temperature, calculate the molarity of the saturated NaCl solution. a. 0.00545 M NaCl b. 0.36 M NaCl c. 5.44 M NaCl d. 6.16 M NaCl e. 20.6 M NaCl

Calculate the pH for each of the cases in the titration of 25.0 mL of 0.220 M pyridine, C₂H₂N(aq) with 0.220 M HBr(aq). The Kh of pyridine is 1.7 x 10-⁹. before addition of any HBr pH = after addition of 12.5 mL of HBr after addition of 24.0 mL of HBr after addition of 25.0 mL of HBr after addition of 35.0 mL of HBr pH = pH = pH = pH =

The vapor pressure of liquid NH3 is 496.0 mmHg at a temperature of 231.4 K. The enthalpy of vaporization, AHvap, for this liquid is 23.3 kJ/mol. What is the vapor pressure of NH3 at a temperature of 233.6 K, in mmHg? ______mmHg

Which of the following aqueous solutions contains the greatest amount of ions or molecules dissolved in water? 750 mL of 0.75 M HBr 250 mL of 1.25 M K3PO4 250 mL of 0.5 M LiBr 1.5 L of 2.25 M C12H22011 2.0 L of 1.5 M K₂SO4

0.15 M aqueous solution of potassium sulfate has on osmotic pressure of 8.21 atm at 27°C. Which of the following is correct about the properties of solution? The value of Van't Hoff factor of K₂SO4 is 3. The value of Van't Hoff factor for K₂SO4 is less than 3 due to partial dissociation of solute. The value of Van't Hoff factor for K₂SO4 is more than 3 due to complete dissociation of solute. The freezing point of solution would be more than 0°C.

A chemistry student weighs out 0.107 g of chloroacetic acid (HCH₂CICO₂) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1100 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits.

How many grams of KMnO4 are required to make 0.653 L of a 1.83 M solution?

(optional) A hospital saline solution is 0.90% NaCl. What is the molar concentration of 0.90% saline (58.44 g/mol) solution? (Assume the density of the solution is 1.01 g/mL.)

Core Chemistry Skill: Calculating the Molar Solubility The solubility of a substance is the quantity that dissolves to form a saturated solution, and it can be represented by the solubility product expression ( Ksp). The solubility product expression is equivalent to the product of the ion concentrations after each is raised to a power that is equal to its coefficient in the balanced equilibrium equation. For an example, see the following reaction involving calcium phosphate and its corresponding solubility product expression: Ca3(PO4)2 (s) = 3Ca²+ (aq) + 2PO4³- (aq) Ksp = [Ca²+1³ [PO4³-1² The molar solubility (S) of a slightly soluble salt is the number of moles of solute that dissolve in 1 L of solution and has the units M. For the example above, every 1 mol of solute that dissolves produces 3 mol of Ca²+ and 2 mol of PO4³ , so the molar solubility is equivalent to S= [Ca²+] 3 (PO₁3-1 2 Part A O MgCrO4 O CrO4²- D Mg2+ If MgCrO4 were added to water to form 1 L of solution, the concentration of which species will be equal to the molar solubility? Check all that apply. ►'View Available Hint(s) Submit Part B Complete previous part(s) 14 of 17 Part C. Complete previous part(s) Review | Constants | Periodic Table

1. What is the concentration of ethanol (C₂H60) solution that was prepared by dissolving 50.500 g of ethanol into water to a final volume of 750.0 mL? Assume the solution has a density of 1.20 g/mL. Show all work. a. % (m/m) b. M

A solution with a total volume of 2.5 liters is composed of 31.4 grams of Na₂S in water. What is the: (a) Molarity of this solution? (1 pt) (b) Osmolarity of this solution? (1 pt) (c) the %mass/volume of this solution? (1 pt)

An aqueous potassium iodate stock solution is made by dissolving 6.79 mol KIO, in sufficient water for the final volume of the solution to be 3.20 L. Calculate the molarity of the stock KIO, solution. molarity of stock KIO, solution= A 10.0 mL aliquot is removed from the described stock solution and diluted to a total volume of 100.0 mL. Calculate the molarity of the dilute solution. molarity of dilute KIO, solution= M M

Calculate the amount of solute, in grams or milliliters, needed to prepare the following solutions: Part B 401 g of a 4.0 % (m/m)KCl solution Express your answer to two significant figures and include the appropriate units. Value Submit HÅ Part C Units Request Answer Review | Constants I Periodi ? 295 mL of a 18 % (v/v) isopropyl alcohol solution Express your answer to two significant figures and include the appropriate units.

Show all work. Round off answers to the nearest tenth place, except for gtt/min calculations which must be rounded off to the nearest whole number. 1. Determine the time of infusion necessary for the IV if a client is receiving 535 ml D5W at 15 gtt/min and the drop factor is 10.

You may want to reference (Page) Section 12.5 while completing this problem. Calculate the final concentration of each of the following. ▼ Part A 1.2 L of a 2.50 MHNO3 solution is added to water so that the final volume is 9.0 L. Express your answer to two significant figures and include the appropriate units. 01 Value Submit μA Part B Units Request Answer Review I Constants I ? Water is added to 0.50 L of a 6.9 MNaF solution to make 2.7 L of a diluted NaF solution. Express your answer to two significant figures and include the appropriate units.

You may want to reference (Page) Section 12.4 while completing this problem. Calculate the mass percent (m/m) for the solute in each of the following solutions. ▼ Express your answer using two significant figures. m/m = 11 % Submit Previous Answers Part C ✓ Correct Since the mass of H₂O is given rather than the total mass of the solution, you must add the mass of KOH given to find the total mass of the solution used in the denominator when calculating mass percent. Therefore, mass% = 41.0 g of Na2CO3 in 277.5 g of Na2CO3 solution Express your answer using two significant figures. Review | Constants I Periodic Table 3.9g KOH 3.9g KOH+333g H₂O x 100

You may want to reference (Page) Section 12.6 while completing this problem. Answer the following questions for the reaction NiCl2 (aq) + 2NaOH(aq) →>> Ni(OH)2 (s) + 2NaCl(aq) ▼ Part A How many milliliters of 0.200 M NaOH solution are needed to react with 33.0 mL of a 0.360 M NiCl2 solution? Express your answer with the appropriate units. O Value Submit μA Part B Units Request Answer Review | Constants I Periodic Table ? How many grams of Ni(OH)2 are produced from the reaction of 46.0 mL of a 1.70 M NaOH solution and excess NiCl₂? Express your answer with the appropriate units.

Aluminum reacts with oxygen to form aluminum oxide, Al2O3. Set up the calculation and solve for the mass ratio of aluminum to oxygen in this compound.

35.8 mL of aqueous 0.255 M Pb(NO3)2 is mixed with 19.1 mL of 0.415 M NaCl. The equation for the precipitate reaction is: Pb(NO3)2 (aq) + 2 NaCl (aq) --> PbCl2 (s) +2 NaNO3(aq) The concentration of NO3 ion in the reaction solution is M.

Use the Henderson-Hasselbalch equation to calculate the pH of a buffer that contains 6.5 M of the acid, HA, and 4.9 M of the conjugate base, A. Assume that the Ka for this acid is 1.6 x 10-6. Show your work and report the pH to two decimals. (4 pts)

Determine whether aqueous solutions of the following salts would be acidic, basic, or neutral: (3 pts) (a) LINO3 Oq bne Hq od: hqs egit (b) NaF (Prepared from LiOH and HNO3) (c) NH4Cl (Prepared from NaOH and HF) (Prepared from NH3 and HCI) 10)

Describe if the following reaction is spontaneous or non-spontaneous based on enthalpy, entropy and Gibbs energy: A H=8457J, A S = 546J, and A G = 432J at room temperature A) Spontaneous B Not spontaneous

What volume of a 0.200 M H2SO4 solution will completely neutralize 83.4 mL of 0.120 M NaOH solution? H₂SO4 (aq) + 2 NaOH (aq) → Na2SO4 (aq) + 2 H₂O (1) To receive any M

5.57 A 2.200-g sample of quinone (C,H,O₂) is burned in a bomb calorimeter whose total heat capacity is 7.854 kJ/°C. The temperature of the calorimeter increases from 23.44 to 30.57 *C. What is the heat of combustion per gram of quinone? Per mole of quinone?

Identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride (NaCl) in water. Drag the appropriate items to their respective bins. ►View Available Hint(s) interactions formed during hydration interactions involving dipole-dipole attractions Solvent-solvent interactions interactions between the water molecules interactions involving ion-ion attractions Solute-solute interactions interactions formed between the sodium ions and the oxygen atoms of water molecules interactions between the ions of sodium chloride Solute-solvent interactions Reset Help

An analytical chemist weighs out 0.087 g of an unknown monoprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. She then titrates this solution with 0.2000 M NaOH solution. When the titration reaches the equivalence point, the chemist finds she has added 4.8 mL of NaOH solution. Calculate the molar mass of the unknown acid. Be sure your answer has the correct number of significant digits.

A chemistry student weighs out 0.133 g of lactic acid (HC₂H5O₂) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1700M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits.

An aqueous solution at 25 °C has a OH concentration of 3.0 × 10 M. Calculate the H₂O* concentration. Be sure your answer has 2 significant digits.

70.0 mL of 3.0 M sodium carbonate is added to 30.0 mL of 1.0 M sodium bicarbonate. Calculate the moles of sodium ions and the concentration of sodium ions in the final solution. (Enter answers without units) moles of Nat in final solution: molarity of Na in final solution:

The solubility of glucose (C6H12O6) is 130 grams in 100 grams of water at 40°C. Which of the following situations would produce a saturated solution? 135 g of C6H12O6 in 100 g of water 100 g of C6H12O6 in 100 g of water 129 g of C6H12O6 in 100 g of water 125 g of C6H12O6 in 100 g of water

Consider a mixture of NaCl, albumin mixture, and starch mixtures in a dialyzing bag. The dialyzing bag is then immersed in distilled water. Which of the following actions should be taken to remove the most salt from the mixture? Leave the dialyzing bag in the distilled water for an extended period of time. Replace the dialyzing bag periodically. Replace the water with fresh distilled water periodically.

The solubility in water of ionic compound X is measured and found to be 0.142 g/mL at 10. °C. Calculate the volume of a saturated solution of Xin water that would contain 360. mg of X at this temperature. Be sure your answer has the correct unit symbol and 3 significant digits.

A certain substance X condenses at a temperature of 149.3 °C. But if a 200. g sample of X is prepared with 7.75 g of urea ((NH2)2CO) dissolved in it, the sample is found to have a condensation point of 150.1 °C instead. Calculate the molal boiling point elevation constant Kb of X. Round your answer to 1 significant digit.

What is the percent by mass of sodium chloride in a solution containing 25 g NaCl, 14 g KCl, and 5 g MgSO4 all dissolved in 175 g of water? Show all work and remember units are part of your answer.

5.00 g of NaCl is dissolved in 25.0 mL of water. Then 4.00 mL of this solution is removed and mixed with 16.0 ml of water. What is the concentration of the final solution in molarity? (Enter answer without units)

What is the osmolarity of a solution containing 0.2 M NaNO3 and 0.3 M sucrose? Select one: 0.7 0.0007 0.14 0.0014

A solution of potassium chloride contains 43.7 g of KCl dissolved in 0.50 L of solution. What is the molarity of this solution? Show all work and remember units are part of your answer.

A sample of Ca (s) is added to water to make a 150. mL solution. Thymol blue indicator is added to the solution. The solution is then titrated with 1.00 M HCI. The initial reading of the burette is 5.00 mL before the titration, and when the color of the solution is observed to change from blue to yellow, the burette reads 38.91 mL. Determine the concentration (in mol/L) of hydroxide ions, [OH-], in the 150. mL solution. Do NOT include units in your answer. If you round during your calculation, be sure to keep at least three (3) decimal places. Report your answer to two (2) decimal places. Answer:

For the reaction shown, calculate the theoretical yield of product in moles for each of the initial quantities of reactants. 2Mn(s) + 30₂(g) → 2MnO3(s) 0.164 mol Mn; 0.232 mol O₂ Express your answer in moles to three significant figures. Theoretical yield = Submit Part D VAZO Request Answer 32.5 mol Mn; 51.8 mol O₂ Express your answer in moles to three significant figures.

MISSED THIS? Watch KCV 8.5. IWE 8.5; Read Section 8.6. You can click on the Review link to access the section in your e Text. For the reaction shown, find the limiting reactant for each of the following initial quantities of reactants. 2 Li (s) + Cl₂ (g) → 2 LiCl (s) 1.0 g Li; 1.0 g Cl₂ Express your answer as a chemical formula. A chemical reaction does not occur for this question. Part B PATC ? 10.5 g Li; 37.2 g Cl₂ Express your answer as a chemical formula.

(1 pts) 4a. Calculate the mass (in g) of NaCl needed to prepare 35.0 mL of a 0.90% w/v NaCl solution. (1pts) 4b. Calculate the mass (in g) of NaCl needed to prepare 35.0 mL of a 20.0% w/v NaCl solution. (3pts) 4c. Describe how you would make the solution for 4a. Be brief, but quantitative, in your answer.

For the reaction shown, calculate how many moles of each product form when the given amount of each reactant completely reacts. Assume that there is more than enough of the other reactant. 2 PbS (s) + 3 0₂ (g) → 2 PbO (s) +2 SO2 (g)

Classify the following pair of compounds. Select the single best answer. O O O identical molecules stereoisomers constitutional isomers not isomers and CH3 23

A chemist prepares a solution of sodium carbonate (Na₂CO3) by measuring out 41.3 g of sodium carbonate into a 450. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's sodium carbonate solution. Round your answer to 3 significant digits.

Calcium chloride reacts with sodium phosphate to form solid calcium phosphate and sodium chloride. Balance the reaction below then answer the questions following. CaCl₂ (aq) + Na3PO4 (aq) + NaCl (aq) Ca3(PO4)2 (s) 1. What is the reaction ratio between CaCl2 and Ca3(PO4)2? 2. How much Na3PO4 is needed to form 10.0 grams of Ca3(PO4)2 ?

A chemist prepares a solution of iron(II) bromide (FeBr₂) by measuring out 150. g of iron(II) bromide into a 350. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's iron (II) bromide solution. Round your answer to 3 significant digits. mol/L x10

Upload your answers to the following problem by midnight tonig Calcium chloride reacts with sodium phosphate to form solid ca Ca3(PO4)2 (s) + CaCl₂ (aq) + Na3PO4 (aq) NaCl (aq) 1. What is the reaction ratio between CaCl₂ and Ca3(PO4)2? 2. How much Na3PO4 is needed to form 10.0 grams of Ca3(PO4

Which sentence is capitalized correctly? O The great wall of China is a series of stone and earthen fortifications in northern china. The Great Wall of China is a series of stone and Earthen fortifications in Northern China. The Great Wall of China is a series of stone and earthen fortifications in Northern China.

A biochemist carefully measures the molarity of sucrose in 97.8 mL of cell growth medium to be 90.5 mm. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 42.1 mL. Calculate the new molarity of sucrose in the cell growth medium. Round each of your answers to 3 significant digits.