Chemistry 1302A/B Lecture Notes - Lecture 2: Sodium Bicarbonate, Chief Operating Officer, Methylamine

• School: Western University
• Department: Chemistry
• Course: Chemistry 1302A/B
• Professor: Beth Gillies

Document Summary

In water, not all the molecules are present as h2o . Therefore, pure water represents a mixture of h2o molecules, h+ ions and oh- ions. The equilibrium constant of this process is called the ionization constant of water, or ion product constant of water, kw. In neutral water, [h+] = [oh-] = 10-7 m. These ion concentrations are quite low, therefore pure water does not conduct electricity very well. The acidity (or basicity) of a solution can be described by its ph value ( power of the hydrogen ion ). or [h+] = 10-ph. A similar approach can be used for the hydroxide ion concentration: [h+] = ph = ph = concentrations in m = mol/l !! ph = -log10[h+] poh = -log10[oh-] concentrations in m = mol/l !! or [oh-] = 10-poh. | log10 log10([h+] [oh-]) = -14 log10[h+] + log10[oh-] = -14. The value log10(kw) = -log10(10-14) = - (-14) = 14 is sometimes called pkw.