00:01
In this video, we want to determine the concentration of the base calcium hydroxide that's titrated with an acid hcl.
00:08
So first, let's write the equation that takes place between the acid and the base.
00:14
So we have calcium hydroxide, coh2, titrated with hcl.
00:19
And when you mix an acid in a base, you get water and a salt.
00:22
So h2o plus the salt where the cation comes from the base, so calcium, and the anion comes from the acid.
00:28
So chlorine, which is calcium is a 2 plus charge and chlorine is a minus 1 charge.
00:35
To make a balanced compound, we need two chlorines for each calcium so that we have two pluses and two minuses.
00:42
So two chlorines, meaning cacl 2.
00:46
And then to balance this, if we want two hydrogens and two chlorines, we need a 2 out in front of the acl.
00:56
Let's see.
00:57
And then to balance out the oxygens, we put a 2 out in front of.
01:00
The water.
01:05
So it's a 2 to 1 ratio of acid to base because of the subscript of 2 for the hydroxide...