Every liquid, except for distilled water, has either acidic or basic traits. An acid is sour tasting, and gives a sharp stinging pain in a cut or wound, and bases taste bitter, and feel slippery. A pH scale is used to determine what traits a liquid has; acidic or basic. The scale focuses on OH- (hydroxide ions) and H+ (hydrogen ions). The scale goes from 0 to 14. 7 is distilled water, as it is directly in the middle; neither acidic or basic. Acids are between 0 and 7 and have a high H+ concentration, and bases from 7 to 14 with a low H+ concentration. Neutralization happens when an acid and base react together and the base is consumed. The product is a neutral solution of water and a salt. HCl (acid) + NaOH (base) changes to H2O and NaCl (water and salt). The purpose of this lab was to determine what happens when and acid reacts with a base, and how to detect a neutralization.
Table: Acids and Bases Lab 2
Compound |Observations |Type of Compound (Acid/base? Ionic/Covalent?) |Amount (Drops) |Conductor of Electricity? Yes/ No | |NaOH (0.5 mol/L)
Reactant |Clear, odourless, liquid |Base
Ionic |20 |Not tested | |Phenolphthalein Indicator
|Clear, liquid, alcohol odour |pH indicator |1 |Not Tested | |HCl (0.5 mol/L) Reactant |Clear, liquid, sour odour |Acid
Ionic |44 |Not tested | |H2O (water)
Product |Clear, liquid, odourless |Non-reactive
|Not measured |No | |NaCl (salt)
Product |White, powdery, crusty, grainy texture |Neither
Ionic |Not measured |Yes | |
In this lab, the neutralization of of an acid and a base was observed. 20 drops of sodium hydroxide were added to an evaporating dish, followed by a drop of phenolphthalein indicator. The solution turned pink when the indicator was included. Quantitative Neutralization was used by adding drops of hydrochloric acid one by one to a sodium hydroxide-phenolphthalein solution. After a certain number of drops were added,...