10 Matching Annotations
  1. Apr 2018
    1. Question 3

      I thought I set this up correctly but I subbed R for .008314 instead of 0.08206....can you suggest a way I can keep these values separated and when to use one over the other??

    1. What is Kc

      What is Kc; i understand Ka = K of acid, Kb = k of base, Kp = K of pressure....what is C...?

    1. (C)  0.1120M

      This value should be 1.120M It is correct in the hint, not in the multiple choice option.

    1. Note: Polyprotic acids and bases react stepwise forming intermediates:

      While reading the text, pg. 587, I was curious about amphiprotic acids and bases. Are all polyprotic acid and base intermediates amphiprotic? or do I have this concept confused?

    2. Conjugate Acid-Base Pairs

      With this being the way my "Chemistry for Dummies" book explains acid base pairs that would mean that the conjugate base to the acid HF would be F-1. Is that how it works or would F-1 have to be in a compound to be counted as a conjugate base?

    3. (any anion with a [-2] charge can accept two protons to become neutral

      Is this simply a statement you are telling us or is this something we need to familiarize ourself with? I do not completely understand the idea. Is there anyway you could explain it further or do I need to try to come up with a different question that would allow you to understand why I am lost?

    1. Ka <100[HA]i

      every other mention shows it the other way around- [HA]i>100Ka. I'm confused on what the switch means

    2. 1.2 g sodium hydride in two liters results in a 0.025M NaOH that would have a pOH of 1.6. From that the final pH is calculated using pH + pOH = 14.  

      says .025M but calculations show .25M

  2. Mar 2018
    1. acid HF,

      I remember discussing during lecture, but why is HF considered a weak acid? Despite the fact, that it has very high electronegative difference. Shouldn't the big electronegative difference cause it to be a stronger acid?