Chemistry, 11.02.2020 00:10 YOURKINGNESS7689
How many moles of HF (Ka=6.8×10−4) must be added to water to form 0.250 L of solution with a pH of 2.90?
Answers: 2
![K_a = \frac{[H^+].[F^-]}{[HF]}](/tpl/images/0505/5441/89d0b.png)
![[H^+] = \alpha .C_M](/tpl/images/0505/5441/c2b04.png)
![K_a = \frac{\alpha.[H^+]}{(1-\alpha )}](/tpl/images/0505/5441/cee55.png)
![[H^+] = 10^{-pH} = 10^{-2.9} = 0.001259](/tpl/images/0505/5441/53851.png)
![K_a = \frac{\alpha.[H^+]}{(1-\alpha )} = \frac{\alpha(0.001259)}{(1-\alpha )} = 6.8 X 10^{-4}](/tpl/images/0505/5441/0a2a4.png)
![[H^+] = \alpha .C_M, 0.001259 = \alpha.4n(HF)](/tpl/images/0505/5441/49698.png)
Another question on Chemistry
Chemistry, 21.06.2019 22:10
How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit
Answers: 1
Chemistry, 22.06.2019 07:30
What is i fracture in the crust called when land move up, down or sideways
Answers: 2
Chemistry, 22.06.2019 14:30
Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.
Answers: 1
Chemistry, 22.06.2019 20:00
For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.
Answers: 2
You know the right answer?
How many moles of HF (Ka=6.8×10−4) must be added to water to form 0.250 L of solution with a pH of 2...
Questions
English, 21.08.2020 19:01
Mathematics, 21.08.2020 19:01
Mathematics, 21.08.2020 19:01
Mathematics, 21.08.2020 19:01
