the substance exists in protonated form with a pka 4.7 . the percentage of protonated form at pH 5.7 will be close?
Answers
Answer:
We have learned that the behavior of chemical functional groups depend greatly on the composition, order and properties of their constituent atoms. As we will see, some of the properties of key biological functional groups can be altered depending on the pH (hydrogen ion concentration) of the solution that they are bathed in. For example, some of the functional groups on the amino acid molecules that make up proteins can exist in different chemical states depending on the pH. We will learn that the chemical state of these functional groups in the context of a protein can have have a profound effect on the shape of protein or its ability to carry out chemical reactions. As we move through the course we will see numerous examples of this type of chemistry in different contexts.
pH
pH is formally defined as:
Equation defining pH
In the equation above, the square brackets surrounding H+ indicate concentration.
If necessary try a math review at wiki logarithm or kahn logarithm.
Also see: concentration dictionary or wiki concentration.
Hydrogen ions are spontaneously generated in pure water by the dissociation (ionization) of a small percentage of water molecules into equal numbers of hydrogen (H+) ions and hydroxide (OH-) ions. While the hydroxide ions are kept in solution by their hydrogen bonding with other water molecules, the hydrogen ions, consisting of naked protons, are immediately attracted to un-ionized water molecules, forming hydronium ions (H30+). Still, by convention, scientists refer to hydrogen ions and their concentration as if they were free in this state in liquid water. This is another example of a shortcut that we often take - it's easier to write H+ rather than H3O+. We just need to realize that this shortcut is being taken, else confusion will ensue.
Water molecule dissosiated into a hydroxyl group and a proton. The proton will then recombine with a water molecule.
Explanation:
9.3 hysichsjscExplanation: