Question
Asked Mar 23, 2020
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What is the pH of 0.0050 M Ba(OH)2(aq)

2.00
11.70
2.30
12.00
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Expert Answer

Step 1

pH scale is the measure of acidity or basicity for a solution. Acidity is defined by the presence of Hydrogen(H+) ion and basicity is defined by the presence of Hydroxide(OH-) ion in the particular solution. 

For Acids it has a value lower than 7.

For Bases it has a value higher than 7.

For Neutral solution has a value 7.

Mathematically-

Chemistry homework question answer, step 1, image 1

Since,

Chemistry homework question answer, step 1, image 2

Step 2

For bases calculate the Hydroxide(OH-) ion by using the relation-

Chemistry homework question answer, step 2, image 1

Since,

 

 Ba(OH)2(aq) completely dissociates can be represented as-

Chemistry homework question answer, step 2, image 2

Here, 2 moles of OH- ions are present therefore, it becomes

2×0.0050=0.01 moles of OH-

Step 3

To calculate pH first substitute value of OH- ion in pOH equation as mentioned above-

Chemistry homework question answer, step 3, image 1

Chemistry homework question answer, step 3, image 2

Chemistry homework question answer, step 3, image 3

Chemistry homework question answer, step 3, image 4

...

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