Part A MISSED THIS? Watch KCV: Finding the [H3O+] and pH of Strong and Weak Acid Solutions IWE: Finding [H3O+] of a Weak Acid Solution, IWE: Finding the pH of a Weak Acid Solution in Cases Where the "x is Small" Approximation Does Not Work ; Read Section 17.6. You can click on the Review link to access the section in your eText. Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8 × 10-4.) 0.230 M Express your answer to two decimal places. ▸ View Available Hint(s) pH = ΜΕ ΑΣΦ Submit Previous Answers × Incorrect; Try Again; 4 attempts remaining Part B 0.0530 M Express your answer to two decimal places. ▸ View Available Hint(s) pH = ΜΕ ΑΣΦ ? ?

Part A MISSED THIS? Watch KCV: Finding the [H3O+] and pH of Strong and Weak Acid Solutions IWE: Finding [H3O+] of a Weak Acid Solution, IWE: Finding the pH of a Weak Acid Solution in Cases Where the "x is Small" Approximation Does Not Work ; Read Section 17.6. You can click on the Review link to access the section in your eText. Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8 × 10-4.) 0.230 M Express your answer to two decimal places. ▸ View Available Hint(s) pH = ΜΕ ΑΣΦ Submit Previous Answers × Incorrect; Try Again; 4 attempts remaining Part B 0.0530 M Express your answer to two decimal places. ▸ View Available Hint(s) pH = ΜΕ ΑΣΦ ? ?

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 58P

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1. Which of the following can act as a Lewis acid? (Hint : In each case, draw the Lewis electron dot structure of the molecule or ion. Are there lone pairs of electrons on the central atom? If so, it can be a Lewis base. Does the central atom lack an electron pair? If so, it can behave as a Lewis acid.) PH3 BCl3 H2S HS−
A student prepares 455 mL of a KOH solution, but neglects to write down the mass of KOH added. His TA suggests that he take the pH of the solution. The pH is 13.33. How many grams of KOH were added?
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A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
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Two students were asked to determine the Kb of an unknown base. They were given a bottle with a solution in it. The bottle was labeled aqueous solution of a monoprotic strong acid. They were also given a pH meter, a buret, and an appropriate indicator. They reported the following data: volume of acid required for neutralization = 21.0 mL pH after 7.00 mL of strong acid added = 8.95 Use the students' data to determme the Kb of the unknown base.
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Novocaine, C13H21O2N2Cl, is the salt of the base procaine and hydrochloric acid. The ionization constant for procaine is 7106. 15 a solution of novocaine acidic or basic? What are [H3O+], [OH-], and pH of a 2.0% solution by mass of novocaine, assuming that the density of the solution is 1.0 g/mL.
Why have chemists not tabulated the fraction ionized for different acids? Such a table would make problems such as calculating the pH of an acid solution quite simple.
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A solution is prepared by adding 50.0 mL concentrated hydrochloric acid and 20.0 mL concentrated nitric acid to 300 mL water. More water is added until the final volume is 1.00 L. Calculate [H+], [OH], and the pH for this solution. [Hint: Concentrated HCl is 38% HCl (by mass) and has a density of 1.19 g/mL; concentrated HNO3 is 70.% HNO3 (by mass) and has a density of 1.42 g/mL.
The pH of a 0.10 MHOBr solution is 4.8. What is H in that solution? ____________M What is OBr-? What is HOBr? Where do the H and OBr- ions comes from? ____________M; ____________M What is the value of Ka for HOBr? What is the value of pKa?____________ ____________