Can u please help me , I couldn’t figure it out for hours. It’s just q e not d or 6 .

if excess acid is added to the solution, it will be more acidic.

Explanation:

The pH of potassium hydroxide= 10 (OH- ions)

pH of hydrochloric acid= 3  (H+ ions)

  KOH + HCl → KCl + H2O  

the pH of the solution will be 7  as it is a neutralisation reaction.

But if the acid is more in amount there will be more H+ ions and the solution will have a lower pH.

(the higher the concentration of H+ ions the more the acidic the solution,

the higher the concentration of OH- ions the more alkaline a solution is. )

1.solid

2.carbon dioxide

3.helium