What is the pH of a solution prepared by mixing 47 mL of 0.073 M Ba(OH)2 and 54 mL of 0.20 M KOH? (This is just a mixing problem: simply add up the mmol OH- and divide by the total mL.)

Answer : The pH of the solution is, 13.2

Explanation :

First we have to calculate the mole of and .

and,

Now we have to calculate the moles of hydroxide ion.

As, 1 mole of dissociates to give 1 mole of barium ion and 2 mole of hydroxide ion.

So, 0.00343 mole of dissociates to give 0.00343 mole of barium ion and (2×0.00343=0.00686) mole of hydroxide ion.

and,

As, 1 mole of dissociates to give 1 mole of potassium ion and 1 mole of hydroxide ion.

So, 0.0108 mole of dissociates to give 0.0108 mole of potassium ion and 0.0108 mole of hydroxide ion.

Now we have to calculate the total moles of hydroxide ion and volume of solution.

Total moles of chloride ion = 0.00686 + 0.0108 = 0.01766 mol

Total volume of solution = 47 mL + 54 mL = 101 mL = 0.101 L

Now we have to calculate the molarity of chloride ion in the final solution.

Now we have to calculate the value of pOH of the solution.

Now we have to calculate the value of pH of the solution.

Therefore, the pH of the solution is, 13.2

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.