A phosphate buffer solution at pH = pK1 = 2

1. A phosphate buffer solution at pH = pK1 = 2.15 would have equal amounts of phosphate in the _______ form and the H2PO4- form.

H3PO4

2. A solution containing a weak acid (pK = 7.5) and its conjugate base at pH of 8.5 has a good capacity to buffer the addition of

acid

3. Phosphate (pK1 = 2.15, pK2 = 6.82, and pK3 = 12.38) will be mostly in the HPO42- form at pH 7.2. At pH 5.82 it is mostly in the _______ form.

H2PO4-

4. A strong acid is completely ionized in water, whereas a weak acid is

only partially ionized

5. the insolubility of nonpolar molecules in water is due to the large ____________ which is the result of water molecules forming an ordered network surrounding nonpolar molecules

negative entropy

6. Octane molecules dispersed in water tend to aggregate because that allows water molecules to be more

disordered

7. for the _____________ represented by D-H---A, the donor D is weakly acidic and the acceptor A is weakly basic

hydrogen bond

8. the polarity of the O-H bond is caused by the ______________ of oxygen relative to that of hydrogen

higher electronegativity

9. The 104.5° bond angle in the water molecule is the result of the _____________ of electron orbitals around oxygen

tetrahedral arrangement

10. translational and _________ thermal motion causes liquid water molecules to reorient approximately every 10-12 seconds

rotational