Dissolution Of Naoh In Water Lab Report

When the sodium hydroxide pellet was added, the test tube became warm and it took awhile to dissolve. The dissolution of NaOH in water resulted in a basic solution (When tested with the red litmus paper, the paper turned a blue color and when tested with the blue litmus paper, the paper remained a blue color). The net ionic equation for the dissolution of NaOH in water is displayed below:

NaOH(s) → Na+(aq) + OH-(aq)

The addition of magnesium hydroxide to water resulted in a cloudy slurry. There was no change in the color of the blue or the red litmus paper. When HCl was added to half of the slurry, the precipitate dissolved. However, when NaOH was added to the other half, the precipitate still remained. The slurry remained a white, cloudy color. Because the slurry dissolved in acid, Mg(OH)2 is a basic solution. The reaction of hydrochloric acid and magnesium hydroxide slurry is denoted below:

Due to this ability to react with both acids and bases, Al(OH)3 is called an amphoteric substance.

Reaction with HCl: Al(OH)3 (s) + 3HCl(aq) → AlCl3 (aq) + 3H2O(l)
Reaction with NaOH: Al(OH)3 (s) + NaOH(aq) → NaAl(OH)4 (aq)

Hydrous silicon hydroxide and water resulted in a cloudy slurry. There was no change in color of the blue litmus paper or the red litmus paper. When HCl was added to one portion of the slurry and when NaOH was added to the other portion of the slurry, there were no reactions in both cases.
The addition of P4O10 to water resulted in an acidic solution (the blue litmus paper turned a red color and the red litmus paper remained the same color). The reaction of P4O10 and water is shown below:
P4O10 (s)+ 6H2O(l) → 4H3PO4