Ph Value

Ba(OH)_2 dissociates completely into

Ba%5E%7B2%2B%7D

and

2OH%5E%7B-%7D

. The concentration of hydroxide ions,

%5BOH%5E%7B-%7D%5D

, is double the concentration of Ba(OH)_2 because each formula unit of Ba(OH)_2 provides two hydroxide ions.
- The concentration of hydroxide ions

%5BOH%5E%7B-%7D%5D%20%3D%202%20%5Ctimes%200.005%20%5C%2C%20%5Ctext%7BM%7D%20%3D%200.010%20%5C%2C%20%5Ctext%7BM%7D

.
Now, we calculate the pOH using the formula:

pOH%20%3D%20-%5Clog%5BOH%5E%7B-%7D%5D

Substitute the value of

%5BOH%5E%7B-%7D%5D

pOH%20%3D%20-%5Clog(0.010)%20%3D%202

Since

pH%20%2B%20pOH%20%3D%2014

, we can calculate the pH:

pH%20%3D%2014%20-%20pOH%20%3D%2014%20-%202%20%3D%2012

Thus, the pH value of the solution is 12.

Chapter Questions
1 MCQs