Identify the species represented by each curve in the fractional composition diagram of a weak base (B) with a pK, of 5.00. Fractional composition 1.00- 0.90- 0.80- 0.70- 0.60- 0.50- 0.40- 0.30- 0.20- 0.10- 9 BH* .95 .0499 5 Incorrect BH* 6 7 -00 8 Calculate the fraction of the weak base in each of its forms at pH 7.64. 9 pH B ….... Answer Bank 10 11 12 13

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14. If the pH at half way to the first equivalence point is 3.20, pH at first and second equivalence points of a diprotic acid are 7.20 and 13.45, respectively, which of the following is correct? a. Kaj = 7.20 %3D b. pKaj = 13.45 c. pKaj = 3.20 d. pKaj = 9.45 %3D e. pKaj = 7.20 %3D

The Kg of "HA" is 4 x 10-10. Calculate the pK. (keep one decimal place). A 0.10 M solution of a weak acid, "HA*, has [Hy0+] = 0.0000072 M. Determine [A] in the solution. (Hint: Where do Hy0* and A° come from?)

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-9 Consider a solution that contain C-H5N and C5H5NH given Kb= 1.7 x 10-⁹ Calculate the ratio [CsHsN] [CsHsNH] if the solution has a PH= 10

The pKa values of some hypothetical acids (HX, HY, HZ, HG) are shown below: HX pka=2.50,  HY pKa=4.72,   HZ  pKa=1.87,   HG  pKa=5.67  Which of the following conjugate bases will be the weakest?  a) X-   b)Y-   c)Z-   d)G-    e)they all have the same strength P.S could you please tell me which concept it is or a topic?

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Hadising Name: 2: Hailey Gary H3C Pre-Lab: Determination of Vinegar Acidity by Titration RES 1. Complete the following neutralization reaction. Identify the weak acid and conjugate base. O Acidic proton OH + OH + Nat Acetic Acid CHM 102