The Ka values for several weak acids are given below. Which acid (and its conjugate base) would be the best buffer at pH 3.7? a. MES: Ka 7.9 x 10
b. HEPES; Ka 3.2 x 103
c. Tris; Ka 6.3 x 109
d. Formic acid: K 1.8 x 10
e. Acetic acid: K 1.8 x 10
Abbreviations:
MES, 4-Morpholineethanesulfonic acid
HEPES; 4-(2-Hydroxyethyl) piperazine-1-ethanesulfonic acid
Tris, 2-Amino-2-hydroxymethyl-propane-1,3 -diol

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

What type of energy do chemical bonds have? what type of energy is it converted to during chemical reactions? question 15 options: chemical bonds have kinetic energy, which is converted to potential energy during chemical reactions. chemical bonds have electric energy, which is converted to potential energy during chemical reactions. chemical bonds have heat energy, which is converted to kinetic energy during chemical reactions. chemical bonds have potential energy, which is converted to heat energy during chemical reactions.