Information for possible unknown weak acids.
Acid pKa Molar Mass (g/mol)
Sodium hydrogen...
![Chemistry](/tpl/images/cats/himiya.png)
Chemistry, 17.03.2020 21:59, marahsenno
Information for possible unknown weak acids.
Acid pKa Molar Mass (g/mol)
Sodium hydrogen sulfate 1.99 120.1
Fluoroacetic acid 2.60 78.04
Chloroacetic acid 2.87 94.49
Mandelic acid 3.41 152.1
Acetylsalicylic acid 3.48 180.2
Lactic acid 3.86 90.08
Ascorbic acid 4.17 176.1
Benzoic acid 4.20 122.1
cis-Crotonic acid 4.41 86.09
Succinamic acid 4.54 117.1
Potassium hydrogen phthalate 5.40 204.2
Disodium hydrogen citrate 6.39 263.1
Sodium hydrogen sulfite 7.20 104.1
A student did the potentiometric titration (with a phenolphthalein indicator present). She saw a color change at 8.25 mL of added 0.1000 NaOH. She had started with 0.1000 g of her unknown acid. Five of her volume/ pH measurements are given below:
vol NaOH added (mL) observed pH
2.00 3.71
4.12 4.20
8.25 10.18
10.00 11.71
12.11 12.02
(a) What is the apparent pKa of her acid?
A. 3.71
B. 4.20
C. 10.18
D. 11.71
E. 12.02
![answer](/tpl/images/cats/otvet.png)
Answers: 3
Other questions on the subject: Chemistry
![image](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 05:00, mprjug6
In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 4.20 mol fe and 6.70 mol nio(oh) react?
Answers: 3
![image](/tpl/images/cats/himiya.png)
![image](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 16:00, jakebuttone
Afuel has 30.43% nitrogen and 69.57% oxygen. find the molecular formula of the compound if it has a mass of 92 grams per mole a. no b. n2o4 c. no2 d. n4o8
Answers: 1
Do you know the correct answer?
Questions in other subjects:
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 25.07.2021 21:10
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/ekonomika.png)
Business, 25.07.2021 21:10
![Konu](/tpl/images/cats/fizika.png)
Physics, 25.07.2021 21:10
![Konu](/tpl/images/cats/mat.png)
Mathematics, 25.07.2021 21:10
![Konu](/tpl/images/cats/en.png)
English, 25.07.2021 21:10
![Konu](/tpl/images/cats/fizika.png)
![Konu](/tpl/images/cats/mat.png)