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vera_ewing

  • one year ago

Which of the following statements about the pH scale is NOT true?

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  1. vera_ewing
    • one year ago
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  2. taramgrant0543664
    • one year ago
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    Which options do you know are true?

  3. vera_ewing
    • one year ago
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    D is true right?

  4. taramgrant0543664
    • one year ago
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    Yes D is true is because thats what the scale shows us how basic or how acidic your solution is

  5. vera_ewing
    • one year ago
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    Are B and C true?

  6. taramgrant0543664
    • one year ago
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    One is true and one is not true

  7. vera_ewing
    • one year ago
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    B is true

  8. vera_ewing
    • one year ago
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    Right?

  9. taramgrant0543664
    • one year ago
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    B is actual the not true one the entire scale involves powers of 10 so for example your solution has a pH of 1, that solution is 10x more acidic than a solution of pH2 and 100x more acid than a solution of pH3. The concentration of H+ ions is the same way so going back if you solution has a pH of 1 you have 10x the H+ ions than a solution of pH 2 and 100x more than a pH of 3

  10. vera_ewing
    • one year ago
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    So that means A is true, and the answer is C?

  11. taramgrant0543664
    • one year ago
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    A,C and D are all true B is not true because a pH of 4 does not have twice the H+ ions of a solution with a pH of 2. The solution with a pH of 2 would have 100x the H+ ions than the solution of a pH of 4

  12. vera_ewing
    • one year ago
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    Ohhh okay that makes so much more sense! Thank you! :)

  13. taramgrant0543664
    • one year ago
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    No problem! Glad to help!

  14. vera_ewing
    • one year ago
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    How about this one? I think either C or D.

  15. vera_ewing
    • one year ago
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    @taramgrant0543664

  16. taramgrant0543664
    • one year ago
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    Something to note about this is that the H+ and the OH- are in aqueous form where the H2O is actually a liquid the H2O would not be present in the expression. If the H2O was not liquid but aqueous then it would be C but since it is a liquid your answer would be B

  17. vera_ewing
    • one year ago
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    Thank you!

  18. vera_ewing
    • one year ago
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    This one?

  19. taramgrant0543664
    • one year ago
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    Ok so lets start off with the pH formula do you know what that is?

  20. vera_ewing
    • one year ago
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    Yeah and I got A as my answer. Can you please check if that's right?

  21. taramgrant0543664
    • one year ago
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    So the pH formula is pH=-log[H+] you almost had it the right way but you have to include that negative so you would have 10^(-6.89)=[H+] so your answer is C

  22. vera_ewing
    • one year ago
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    Thanks! It's either B or D right? What is the pH of a solution whose [H+] = 5 × 10-8 M? A. 7.3 B. 8.0 C. -7.3 D. -8.0

  23. taramgrant0543664
    • one year ago
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    Sorry nope! How did you come to the conclusion that it is either B or D?

  24. vera_ewing
    • one year ago
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    Well doesn't pH have to be a multiple of 10?

  25. taramgrant0543664
    • one year ago
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    pH is not necessarily a multiple of 10. The only time it is in multiples of 10 is when you are talking about a solution of pH of 1 being 10x more acidic than the pH of 2 solution or the pH1 solution having 10x more H+ ions than that of a solution of pH2 In this case pH=-log(5x10^(-8))= a pH of 7.3

  26. vera_ewing
    • one year ago
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    Ah, okay thank you! What is true of a Brønsted-Lowry acid? A. A Brønsted-Lowry acid donates H+ ions. B. A Brønsted-Lowry acid donates OH- ions. C. A Brønsted-Lowry acid donates electrons. D. A Brønsted-Lowry acid donates a metal.

  27. taramgrant0543664
    • one year ago
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    It would be A as it releases/donates H+ ions because it is a proton donor

  28. vera_ewing
    • one year ago
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    Thanks! This one?

  29. taramgrant0543664
    • one year ago
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    I would say C as the combination should make a a salt and H2O

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