Which of the following molecules have a hydrogen with a pk, value between 20 and 25? O O OH NH₂ -H H O none of these

What is the major organic product obtained from the following reaction? Ph OH ○ 1 02 03 SOCI₂ Ph CI CI Ph OH 1 2 Ph OCI Ph OH 3

Acid Ka pKa HF 7.1 x 10-4 3.15 HNO2 4.5 x 10-4 3.35 HCOOH 1.7 x 10-4 3.77 C6H5COOH 6.5 x 10-5 4.19 CH3COOH 1.8 x 10-5 4.74 HCN 4.9 x 10-10 9.31 C6H5OH 1.3 x 10-10 9.89  Using the table, select appropriate acid/conjugate bases combinations and the proportions of each to prepare buffers at pH values of (i) 4.5 and (ii) 10.0

Given the following: [H3O+] = 5.112 x 10-13, please calculate the pOH.(Note please use 3 sig. figs for your answer.)

Given the pkb table below of newly discovered bases, which acid would you expect to be the weakest? ZO₂ XO₂ YO₂ ΑΟ2 D BO₂ pkb 5.5 7.2 7.6 8.2 8.3

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Rank the labeled H's in the following molecules in order of increasing acidity (1 = least acidic, 5 = most acidic). Provide a brief explanation for your ordering. 2. %3| HO a e HO HO, Br H CI H b d

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