1 c.c of 0.1 N HCl is added to a 1 liter solution of sodium chloride. The pH of the resulting solution will be:A) 7B) 0C) 10D) 4

When you add a small amount of a strong acid like HCl to a solution of a weak base like sodium chloride (NaCl), you'll create a slightly acidic solution due to the hydrolysis of the salt. The resulting pH will be less than 7.

In this case, since the solution contains sodium chloride (NaCl), it will undergo hydrolysis, which involves the reaction of water with the salt to produce hydroxide ions (OH-) and hydronium ions (H3O+). The hydrolysis reaction for NaCl is:

NaCl + H2O ⇌ Na+ + OH- + H3O+

The hydroxide ions (OH-) produced from the hydrolysis will slightly raise the pH, making the solution basic, while the hydronium ions (H3O+) from the hydrolysis will slightly lower the pH, making the solution acidic.

Given that you're adding a small amount of a strong acid (HCl) to the solution, it will shift the equilibrium towards the acidic side, further lowering the pH. The pH of the resulting solution will be less than 7.

Among the options provided, the closest one to being correct is option D) 4. This indicates that the pH of the resulting solution will be around 4, which reflects the acidic nature of the solution after the addition of the HCl.