In the second test tube we had 3mL of 1M NH3and phenolphthalein indicator. The o
ID: 760925 • Letter: I
Question
In the second test tube we had 3mL of 1M NH3and phenolphthalein indicator. The original solution was bright pink the solution is basic. We then slowly added 1M of HCl, the addition of the HCl made the solution clear and colourless, this indicates that the solution is very acidic. The addition of HCl for the reaction works to reduce the amount of HCl (reactant) so the reaction will shift towards the products to reach equilibrium. NH3(aq) + HCl(aq) ? NH4Cl (aq) Is NH4Cl an acid or base? does the HCl ionize the NH3 base? is the a conjugate acid or base, HCl is a strong acid, what happens when a strong acid and weak base are mixed?Explanation / Answer
.NH4Cl is Acidic. When it is dissolved in water, it dissociates to form NH4+ and Cl- ions. The Cl- ions have no effect on pH, but NH4+ dissociates somewhat to give NH3 and H+, which decreases the pH of the solution.
.NH3 + H2O > NH4+ + OH-
base: OH-, conjugate acid: NH4+
HCl + H2O > H3O+ + Cl-
acid: H3O+, conjugate base: Cl-
.1. The base will be completely neutralized, and the acid partially neutralized. Therefore the solution will remain acidic, though not as acidic as it would be if the base had not been added.
2. "Antacid" is not a specific class of chemicals. It's a medical term for anything that will neutralize an acid. Bases are antacids, but so are carbonates and a few other chemical groups. Adding one antacid to another is not likely to produce a reaction.