A student following the procedure in this lab prepared 4 solutions by adding 12.00, 23.00, 26.00, and 34.00 mL of a 8.25 x 10-2 M NaOH solution to 50.00 mL of a 0.150 M solution of weak acid. The solutions were labeled 1, 2, 3, and 4 respectively. Each of the solutions was diluted to a total volume of 250 mL with DI water. The pH readings of these solutions were: (1) 6.38 (2) 6.73 (3) 6.80 (4) 6.98

the answer is c.the valence of the atoms combine .

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.