Chemistry, 18.03.2020 21:59 afifakiran5226
Phenolphthalein is an indicator that turns from colorless (acidic form) to magenta (basic form) and has a pKa of 9.40. What is the ratio of the magenta phenolphthalein concentration to the colorless phenolphthalein concentration ([magenta phenolphthalein]/[colorless phenolphthalein]) at a pH of 11?
Answers: 1
![pH=pK_a+\log(\frac{[salt]}{[acid]})](/tpl/images/0552/6240/e4eea.png)
![pH=pK_a+\log(\frac{[magenta(Php)]}{[Php]})](/tpl/images/0552/6240/ed1ee.png)
= negative logarithm of acid dissociation constant of phenolphthalein = 9.40![[magenta(Php)]](/tpl/images/0552/6240/398bf.png)
= concentration of magenta phenolphthalein![[Php]](/tpl/images/0552/6240/c3176.png)
= concentration of colorless phenolphthalein![11=9.40+\log(\frac{[magenta(Php)]}{[Php]})](/tpl/images/0552/6240/4797c.png)
![\log(\frac{[magenta(Php)]}{[Php]})=11-9.40=1.6](/tpl/images/0552/6240/3f9c3.png)
![\frac{[magenta(Php)]}{[Php]}=10^{1.6}=39.81 :1 \approx 40:1](/tpl/images/0552/6240/e1375.png)
Another question on Chemistry
Chemistry, 21.06.2019 15:40
What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry
Answers: 1
Chemistry, 21.06.2019 22:20
Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d.the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge
Answers: 2
Chemistry, 22.06.2019 07:00
At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure
Answers: 2
Chemistry, 22.06.2019 14:20
You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring
Answers: 1
You know the right answer?
Phenolphthalein is an indicator that turns from colorless (acidic form) to magenta (basic form) and...
Questions
Mathematics, 11.03.2021 21:30
English, 11.03.2021 21:30
English, 11.03.2021 21:30
Physics, 11.03.2021 21:30
History, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
History, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
Geography, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
Mathematics, 11.03.2021 21:30
