iPad 7:13 PM * 60%- . Chapter 16 Homework Set B: Attempt1 Question Completion St

Question

iPad 7:13 PM * 60%- . Chapter 16 Homework Set B: Attempt1 Question Completion Status: 4.00000 points Save Answer UESTION 14 At a certain temperature, Kw has a value of 5.9 x 1014. What is the concentration of OH in a solution that has a hydronium concentration of 4.5 x105? 4.00000 points Save Answer UESTION 15 At a certain temperature, Kw has a value of 6.9 x 1015. What is the concentration of H30t in a pure water solution at this temperature? Click Save and Submit to save and submit. Click Save All Answers to save all answers Save All Answers Close Window Save and Submit

Explanation / Answer

14) by definition

Kw = [H30+] [OH-]

5.9 x 10-14 = [4.5 x 10-5] [OH-]

[OH-] = 1.3111 x 10-9 M

15)

Kw = [H30+] [OH-]

in a pure water solution , [OH-] = [H30+]

so

6.9 x 10-15 = [H30+] [H30+]

[H30+] = sqrt (6.9 x 10-15)

[H30+] = 8.3066 x 10-8 M

18)  

Na2CO3 --> basic

NaCl ---> neutral

ZnCl2 --> acid

KnO2 ---> basic

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