Buffer is formed from weak acid and its salt with strong base (conjugate base) so the correct answer will be 0.1 M HCN and 0.1 M LiCN and all other choices are incorrect
Answer:
The value of the dissociation constant will be:
.
Explanation:
At ,t= 0 c 0 0
At eq'm (c-x) x x
Concentration of aspirin = c
Expression for dissociation constant will be given as:
![K_a=\frac{[H^+][As^+]}{[AsH]}=\frac{x\times c}{(c-x)}=\frac{x^2}{(c-x)}](https://tex.z-dn.net/?f=K_a%3D%5Cfrac%7B%5BH%5E%2B%5D%5BAs%5E%2B%5D%7D%7B%5BAsH%5D%7D%3D%5Cfrac%7Bx%5Ctimes%20c%7D%7B%28c-x%29%7D%3D%5Cfrac%7Bx%5E2%7D%7B%28c-x%29%7D)
..(1)
The pH of the solution = 2.60
The pH of the solution is due to free hydrogen ions whcih come into solution after partial dissociation of aspirin.
![pH=2.60=\log[H^+]=-\log[x]](https://tex.z-dn.net/?f=pH%3D2.60%3D%5Clog%5BH%5E%2B%5D%3D-%5Clog%5Bx%5D)
Putting value of x in (1).
The value of the dissociation constant will be:.
Element atomic number position
Ba 56 group 2, period 6
Ca 12 group 2, period 3
S 16 group 16, period 3
Si `14 group 14, period 3
Now, you need to know the properties of the different type of elements and the tendencies on the periodic table.
The metallic elements are, those placed on the left side of the periodic table, are the ones that release an electron more easily, so they will requiere less energy to give it up when forming chemical bonds.
The higher the metallic character the less the energy need to give up an electron.
The metallic character grows as the group number decreases (goes to the left) period increases (goes downward), so among the elements considered, Barium will require the least amount of energy to give un an electron when forming chemical bonds.
Atomic number is Z. Z=number of protons, so Z=11
Answer:
69.4
Explanation:
There isn't one, I just took the test.
