# Just brushing up on chemistry

by lostsheep
Tags: brushing, chemistry
 Sci Advisor P: 987 K is called a dissociation constant What K states is that there is a certain amount of dissociation at any given time, and almost everything has one of these numbers. Something like lead chloride will have a K value to say how soluble it is. Here you are talking about water, and K relates to water breaking from HOH into H and OH. For water, the dissociation constant is 10^-14. $$[H^+] * [OH^-] = 10^{-14}$$ $$K_A * K_B = 10^{-14}$$ $$pK_A + pK_B = 14$$