x C At A Certain Temperatur x 1713239 temperature ph-neutral solution 782-value-

Question

x C At A Certain Temperatur x 1713239 temperature ph-neutral solution 782-value-kw-temperature expr Materingchemistry oh 17-Hw Google a m80626228 https//sessionmasteringchemistry com/myct/i General Chemistry II Spring 2017 17 of 45 Acid-Base Relationships in Water Part A At a certain temperature, the pHof a neutral solution is 746. What is the value of K- at that Water ionizes by the equation H (aq) +OH (aq) The extent of the reaction is small in pure water Express your answer numerically using two significant figu and date aqueous solutions. This reaction creates the following relationship between H'land Keep in mind that, ke all equilibrium constants. the value of K- changes with temperature. A. 3.46.10 Submit Hints MLAnswers Review part incorrect one attempt remaining; Try Again Part B What is the pH of a neutral solution at a temperature where K 8.0 x 10 Express your answer numerically using two decimal places. pH 655 Hints Ma Answers Give Up BrynwPart Correct Since the dissociation constant K. a 80 10 14 is greater than that at 25 C the concentration of H'lat equilibrium is also greater

Explanation / Answer

Part A)

Kw = [H+][OH-]

In a solution,

[H+] concentration = [OH-] concentration

with,

pH = -log[H+] = 7.46

[H+] = 3.47 x 10^-8 M = [OH-]

Thus,

Kw = (3.47 x 10^-8 M)(3.47 x 10^-8 M)

      = 1.20 x 10^-15 at this temperature

Part B) At the temperature

with Kw = [H+][OH-] = 8 x 10^-14

[H+] = [OH-] in solution

[H+]^2 = 8 x 10^-14

[H+] = sq.rt.(8 x 10^-14)

        = 2.83 x 10^-7 M

So,

pH = -log[H+]

      = -log(2.83 x 10^-7)

      = 6.55

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