Ammonium cation (NH4+) has a pKa of about 9.3. What is true of this compound when the pH is equal to 9.3? a. None of the molecules have a charge b. It is deprotonated and negatively charged c. It is p Which of the following substances is the weakest acid? a. boric acid, H3BO3...
When one-half of the acid reacts to dissociation and the concentration of the proton donor (acid) equals that of the proton acceptor, the buffering area reaches its halfway (base). In other words, the pKa is equal to the pH of an equimolar acid solution (e.g., where the concentratio...
So, the pH scale ranks the acidity of a solution. What Is pKa? Now that we have an answer to “what is pH?” let’s move on to pKa. pKa is the measurement of acidity or basicity of achemicalorfunctional group. The acidity or basicity of a chemical or functional group can be defin...
At what ratio of weak acid to its conjugate base does the pH equal to the pK_a of the acid-base pair? Explain this in terms of the Henderson-Hasselbalch equation. Given the following pK_a values.\\begin{matrix} & pK_a\HClO_2 & 1.96\CH_3COOH & 4.74\HIO & 10.6\H_3BO_3 & 9.2...
At the first equivalence point, you form an ampholyte of the polyprotic acid. The pH of an ampholyte when concentrated is equal to the average of the adjacent pKas.Answer and Explanation: Given: pKa1=6.37pKa2=10.32 From the ...
Using budding yeast as a model and single-cell methods to dynamically measure metabolic activity, we observe two peaks in protein synthesis, in the G1 and S/G2/M phase, whereas lipid and polysaccharide synthesis peaks only once, during the S/G2/M phase. Integrating the inferred biosynthetic...
Lemonade generally refers to lemon juice, which is a mixture of acids such as citric acid and sodium salts such as sodium citrate. The mixture is acidic because citric acid has a low pKa, its first pKa is 3.1, so an equal mixture of acid and conjugate base has a pH = 3.1. Typically...
Missing hydrogens were added, and appropriate bond orders were assigned to the structures. The protonation states of the polar residues were optimized with the protassign module of PPW, which uses PROPKA to predict pKa values (pH 7.0 ± 2.0) and side chain functional group orientations. The ...
The data indicate that both the monoanion and the dianion forms of the phosphonate bind PTP1 with equal efficiency. Thus, the better binding by the F2Pmp-peptide as compared to the Pmp-peptide is not due to the difference in pKa2. Taken together, these results offer an explanation for the...
Ammonium cation (NH4+) has a pKa of about 9.3. What is true of this compound when the pH is equal to 9.3? a. None of the molecules have a charge b. It is deprotonated and negatively charged c. It is p What is the basicity of H3PO3?