Final answer:
When a chemist combines 7.0 mL of 3.0 M HCl and 7.0 mL of 3.0 M NaOH, the resulting solution will be neutral.
Step-by-step explanation:
When a strong acid and a strong base are combined in the proper amounts, a neutral solution is formed. In this case, the chemist combined 7.0 mL of 3.0 M HCl and 7.0 mL of 3.0 M NaOH. Both HCl and NaOH are strong acids and bases, respectively. Thus, the resulting solution will be neutral.