The reaction where one component splits into two or more is a decomposition reaction.
The dissociation reaction of acetic acid is as follows:
The acid dissociation constant K_{a} is 
.
Let the initial concentration of acid be A, and concentration of 
and 
be zero.
After dissociation, concentration of acid becomes A-x and that of both and becomes x.
Expression for acid dissociation constant will be:
![K_{a}=\frac{[CH_{3}COO^{-}][H^{+}]}{[CH_{3}COOH]}](https://tex.z-dn.net/?f=K_%7Ba%7D%3D%5Cfrac%7B%5BCH_%7B3%7DCOO%5E%7B-%7D%5D%5BH%5E%7B%2B%7D%5D%7D%7B%5BCH_%7B3%7DCOOH%5D%7D)
pH of solution is 3.5, thus, concentration of hydrogen ion can be calculated as follows:
![pH=-log[H^{+}]](https://tex.z-dn.net/?f=pH%3D-log%5BH%5E%7B%2B%7D%5D)
On rearranging,
![[H^{+}]=10^{-pH}=10^{-3.5}=0.0003162](https://tex.z-dn.net/?f=%5BH%5E%7B%2B%7D%5D%3D10%5E%7B-pH%7D%3D10%5E%7B-3.5%7D%3D0.0003162)
Since, ![[CH_{3}COO^{-}]=[H^{+}]=x](https://tex.z-dn.net/?f=%5BCH_%7B3%7DCOO%5E%7B-%7D%5D%3D%5BH%5E%7B%2B%7D%5D%3Dx)
Thus,
![[CH_{3}COO^{-}]=0.0003162](https://tex.z-dn.net/?f=%5BCH_%7B3%7DCOO%5E%7B-%7D%5D%3D0.0003162)
and, 
Putting the values, in expression for acid dissociation constant,
![1.76\times 10^{-5}=\frac{(0.0003162)(0.0003162)}{[CH_{3}COOH]_{initial}-0.0003162}](https://tex.z-dn.net/?f=1.76%5Ctimes%2010%5E%7B-5%7D%3D%5Cfrac%7B%280.0003162%29%280.0003162%29%7D%7B%5BCH_%7B3%7DCOOH%5D_%7Binitial%7D-0.0003162%7D)
On rearranging,
![[CH_{3}COOH]_{initial}=\frac{(0.0003162)\times (0.0003162)}{1.76\times 10^{-5}}+0.0003162=0.006](https://tex.z-dn.net/?f=%5BCH_%7B3%7DCOOH%5D_%7Binitial%7D%3D%5Cfrac%7B%280.0003162%29%5Ctimes%20%280.0003162%29%7D%7B1.76%5Ctimes%2010%5E%7B-5%7D%7D%2B0.0003162%3D0.006)
I am studying about Ions in my science class.
Answer: True
Explanation:
The speed of light in a material medium depends on its molecular structure, in particular its electromagnetic properties, electrical and magnetic permeability. These properties may have different values for different wavelengths or frequencies of the incident light.
In this way,<u> the speed of light depends on the medium and reaches its maximum value in a vacuum</u>, so that, it will be lower in a material medium . In the vacuum (or in the air) the speed of light is 3 x 10⁸ m / s and in any other medium its value is lower.
<u>To characterize the particularities of the propagation of light in the media</u>, the refractive index is introduced
,
n = c / v
where c is <u>speed of light in a vacuum</u> and v is t<u>he speed of light in the medium</u> considered
. So the speed of light in a medium is given by the refractive index whose value is always greater than 1.
