For all of the following questions 20.00 ml of 0.200 m hbr is titrated with 0.200 m koh.
region 1: initial ph: before any titrant is added to our starting material
what is the concentration of h+ at this point in the titration?
m

what is the ph based on this h+ ion concentration?

Answer :

The concentration of before any titrant added to our starting material is 0.200 M.

The pH based on this ion concentration is 0.698

Explanation :

First we have to calculate the concentration of before any titrant is added to our starting material.

As we are given:

Concentration of HBr = 0.200 M

As we know that the HBr is a strong acid that dissociates complete to give hydrogen ion and bromide ion .

As, 1 M of HBr dissociates to give 1 M of

So, 0.200 M of HBr dissociates to give 0.200 M of

Thus, the concentration of before any titrant added to our starting material is 0.200 M.

Now we have to calculate the pH based on this ion concentration.

pH : It is defined as the negative logarithm of hydrogen ion concentration.

Thus, the pH based on this ion concentration is 0.698

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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.