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
Read more on pH here; brainly.com/question/22390063
129600/24= 5400 seconds
5400/60= 90 minutes
Therefore the movie is 90 minutes long.
Let Z be a random variable following the standard normal distribution with mean µ = 0 and standard deviation σ = 1.
The 67th percentile of the distribution is the value z that separates the bottom 67% of the distribution from the top 100% - 67% = 33%. In terms of probability, we have
Pr[Z ≤ z] = 0.67
Use the inverse CDF for the normal distribution (or lookup z scores in a table) to find
z = ɸ⁻¹(0.67) ≈ 0.4399
where ɸ(z) is the CDF for the normal distribution.
This is the description about Delia's character in the story by Edith Wharton:
Although I was no able to find the passage, there are some characteristics about Delia Benson Corbett that can be useful to analyze her choices and actions.
Delia was challenged mentally and emotionally by her first husband. However, she was able to leave her past behind. She uses her irony to deal with her past suffering and she also grew strength by focusing on her own and her job, as well as her belief in religion.
<h3>What is an essay?</h3>
In this exercise, you have to write the description about the passage using an essay structure.
An essay is a written text that can express an opinion about something. You need to do a research before writing an essay so you can get all the information to justify your opinions. In this case, you have to analyze the passage given.
This is an essay structure:
- introduction: you could present the story and explain that there are choices and actions from Delia that can explain how is she a complex character.
- body: here you have to analyze Delia's choices and actions and prove what you presented in the introduction.
- conclusion: you can give a summary about the main idea of the essay.
Check more information on writing essays brainly.com/question/11473248
