Nobel gasses already have the octect in their valence energy level. Noble gasses can be found in family 18. These gases include Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), Radon (Rn), and lastly Ununoctium (Uuo)!
- Miriam
Answer:
Air temperature is not accurate but it can measure by the air is cold or hot
Hope this will help you
pH of mixed solution = 4.3
<h3>Further explanation
</h3>
A buffer solution is a solution that can maintain a good pH value due to the addition of a little acid or a little base or dilution.
The buffer solution can be acidic or basic
Acid buffer solution consists of weak acids and their salts.
![\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}](https://tex.z-dn.net/?f=%5Ctt%20%5Cdisplaystyle%20%5BH%5E%2B%5D%3DKa%5Ctimes%5Cfrac%7Bmole%5C%3Aweak%5C%3Aacid%7D%7Bmole%5C%3Asalt%5Ctimes%20valence%7D)
valence according to the amount of salt anion
mol CH₃COOH = 25 ml x 0.9 = 22.5 mlmol
mol NaOH = 25 ml x 0.45 = 11.25 mlmol
ICE method :
Reaction
NaOH + CH₃COOH ---> CH₃COONa + H₂O
11.25 22.5
11.25 11.25 11.25 11.25
11.25 11.25 11.25
mol acid = 11.25, mol salt = 11.25, Ka CH₃COOH = 5.10⁻⁵
Then [H⁺]=
![\tt [H^+]=5.10^{-5}.\dfrac{11.25}{11.25\times 1}\rightarrow salt~valence=1\\\\(H^+]=5.10^{-5}\\\\pH=5-log5=4.3](https://tex.z-dn.net/?f=%5Ctt%20%5BH%5E%2B%5D%3D5.10%5E%7B-5%7D.%5Cdfrac%7B11.25%7D%7B11.25%5Ctimes%201%7D%5Crightarrow%20salt~valence%3D1%5C%5C%5C%5C%28H%5E%2B%5D%3D5.10%5E%7B-5%7D%5C%5C%5C%5CpH%3D5-log5%3D4.3)
A neutral solution means we are having equal amount of H⁺ and OH⁻. As we know,
Kw = [H⁺] [OH⁻] ------ (1)
So, in order to calculate Kw we first need to calculate [H⁺] and [OH⁻],
As, pH = -log [H⁺]
Or,
[H⁺] = 10⁻ˣ ∴ x = pH = 7.61
Putting value, and solving
[H⁺] = 2.45 × 10⁻⁸
As, our system is neutral, so concentration of [OH⁻] is exactly equal to concentration of [H⁺]. Now, putting values of [H⁺] and [OH⁻] in equation 1.
Kw = [2.45 × 10⁻⁸] [2.45 × 10⁻⁸]
Kw = 6.00 × 10⁻¹⁶
Well uncontrolled cell division can lead to cancer.