Answer Happy

What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H₂A, HA¯, A²-) at pH 6.99? The acid dissociation constant values for piperazine are K₁₁ = 4.65 × 10-6 and K₁2 = 1.86 × 10-¹⁰. αH₂A = aHA = Enter numeric value
A 0.11 M solution of a base is 1.7% hydrolyzed (a = 0.017). Find K₁. Kb =
Identify the species represented by each curve in the fractional composition diagram of a diprotic acid (H₂A) with pK, values of 5.00 and 9.00. Fractional composition 1.00- 0.90- 0.80- 0.70- 0.60- 0.50- 0.40- 0.30- 0.20- 0.10- aH₂A HA- DOG 8 pH 0 αA²- Calculate the fraction of the diprotic acid in each of its forms at pH 5.60. = aHA- = H₂A 11 Answer Bank 10 11 12 13
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 DE Answer Bank 9 1.00- 0.90- 0.80- 0.70- 0.60- 0.50- 0.40- 0.30- 0.20- 0.10- 0 αBH+ = αB = 5 21 BH+ 6 Calculate the fraction of the weak base in each of its forms at pH 8.18. PH 10 11 12 13