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![What is the ratio of base [A] to acid [HA]
at pH 4, 5, 6 and 7 for an acid with a pka
of 6?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbc2a6021-039e-42ef-ade4-d4f55d9b1f3f%2Fc66255ef-8f42-4fb2-a6ca-78699b7b8365%2Frfnmijb_processed.jpeg&w=3840&q=75)
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- Dicarboxylic acids have two dissociation constants, one for the initial dissociation into a monoanion and one for the second dissociation into a dianion. For oxalic acid, HO2C—CO2H, the first ionization constant is pKal = 1.2 and the second ionization constant is pKa2 = 4.2. Why is the second carboxyl group far less acidic than the first?For an acid HA with a pKa of 5.2, what is the ratio of the concentration of the conjugate base to that of the acid at pH 7.2.What is the pKa of a weak acid with a Ka of 4.7 X 10-6?
- Given that C6H11COOH has a pKa = 4.8 and C6H11N + H3 has a pKa = 10.7, what pH would you make the water layer to cause both compounds to dissolve in it?Citric acid, a triprotic acid, has 3 pKa values (3.128, 4.761, and 6.396). What is the pKb of trisodium citrate? 1.34 x 10–11 7.604 10.872 9.239Phenolphthalein has a pKa of 9.7. It is colorless in its acid form and pink in its basic form. For pH=2.2, calculate [In−]/[HIn]. For pH= 4.8, calculate [In−]/[HIn]. For pH= 7.7, calculate [In−]/[HIn]. For pH= 11.4, calculate [In−]/[HIn].
- Two pKa values are reported for malonic acid, a compound with twoCOOH groups. Explain why one pKa is lower and one pKa is higher thanthe pKa of acetic acid (CH3COOH, pKa = 4.8).The base B has pKb 4.00. Find the fraction in the form B and the fraction in the form BH at pH (a) 9.00; (b) 10.00; (c) 10.30.4 Which nitrogen is pKa1 and pKa2 and explain why. Draw the salt form at ohysiological pH
