The calculated pH of the solutions are given below:
- The pH of the solution after 14.0 ml of base is added to it is calculated as 1.45.
- The pH of the solution after 19.8 ml of base is added to it is calculated as 3.0
- The pH of the solution after 20.0 ml of base is added to it is calculated as 7.
<h3>What is pH?</h3>
This is the level of acidity or alkalinity of an aqueous solution. The pH of a substances tells if its an acid, base or neutral.
HBr and NaOH while in water would dissociate and they would become H+ and OH- respectively.
Mol of HBr = Mol * Vol
= 0.200 * 20mL
= 4 mmol
A. Moles of NaOH added
= 0.2 X 14
= 2.8 mmol
Moles of H+ that did not react
= 4 - 2.8
= 1.2 mmol
1.2/1000 = 0.0012 moles
Total volume = 20 + 14
= 34 mL to litres
= 0.034 L
Molarity of H+ = 0.0012 / 0.034L
= 0.035 M
-log[0.035] = 1.45
The pH of the solution is 1.45
B. NaOH added = 19.8 * 0.2 =
3.96 mmoles
The unreacted solution
= 4.0 - 3.96
= 0.04 mmol
0.04/1000 = 0.00004 moles
Total volume = 20 + 19.8
= 39.8mL
Converted to litres = 0.0398L
Molarity = 0.00004 / 0.0398L
= 0.001
-log(0.001) = 3.0
The ph Is therefore 3.0
C. Moles of NaOH added = 0.2*20mL = 4mmol
All the H+ are going to be consumed here. This would result into a neutral solution pH = 7
<u>Complete question:</u>
20.0 mL sample of 0.200 M HBr solution is titrated with 0.200 M NaOH solution. Calculate the PH of the solution after the following volumes of base have been added.
A. 14.0 mL
B. 19.8 mL
C. 20.0 mL
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2. Use an approved sensitive compartmented information (SCI) fax machine.
A sensitive compartmented information (SCI) can be defined as a United States program that was established to segregate classified information concerning or derived from methods, analytical processes and intelligence sources, into distinctive compartments for added protection when disseminated or distributed.
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Based on national intelligence, when faxing a sensitive compartmented information (SCI), the actions you should take include:
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I dunno.. it's so big maybe if it blew up immediately we wouldn't have time to notice before we're baked to perfection.
Answer:
a line that passes through (2,3) and (8,6)” then its slope is 3/6 = 1/2.
Explanation:
In the question excerpt, that element was the friendship between the nobility and the knight.
The king was believed to have been appointed by God himself. Religion played an important role in medieval culture. The importance of Christian practice is evident from the excerpts provided. The choice of words is indicative of Christianity and its practices, and excerpts can be read as "the band's singing came to an end" and "a loud cry came from the clergy and others proclaiming Noel again". increase.
Also, the word "gift" refers to the exchange of goods during the Christmas season. The practices depicted in the poem reflect the religious beliefs of the culture of medieval society and, of course, the court of King Arthur and his Round Table.
Learn more about Christian practices:
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