Answer:
Because the kind of compounds that you try to determine using paper chromatography (organic compounds) are usually not soluble in water. Furthermore, water could react chemically with some of this compounds, because it's a very reactive molecule. You need organic solvents that are mostly inert.
The ph of the buffer solution is 7.743.
What is the Henderson-Hasselbalch Equation?
The Henderson-Hasselbalch equation establishes a relationship between the pKa and pH of acids. When the concentration of the acid and its conjugate base and the associated conjugate acid, are known, the pH of a buffer solution can be determined with the use of this equation.
We use Henderson-hasselbalch equation,
pH = pKa + log [Base] / [Acid]
pKa = -log Ka = -log (3.0 x 10^-8) = 7.46
pH = 7.52 + log [0.250] / [0.150]
pH = 7.52+ 0.2227
pH = 7.743
Therefore, the ph of the solution is 7.743.
To learn more about Henderson-Hasselbalch Equation from the given link.
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Answer:
386.45 K
Explanation:
We can solve this problem by using <em>Charles' law</em>, which states that at constant pressure:
Where subscript 1 stands for initial conditions of volume and temperature, while 2 stands for the final ones. Meaning that in this case:
- T₁ = 36 °C ⇒ 36 +273.16 = 309.16 K
We<u> input the data</u>:
- 2.0 L * T₂ = 2.5 L * 309.16 K
And <u>solve for T₂</u>:
According to the Law of Conservation of Energy, energy is neither created nor destroyed. It is an entity that's always existing in the environment. It takes different forms of energy. Among the choices, the best answer would be letter B. Chemical energy. The chemical energy originates from the energy within the muscles that are dormant. Once used, this chemical energy is transformed into mechanical energy by the action of pushing his foot on the ground.
That substance mixes with another substance to create a new substance or a chemical mixes with a different chemical = a new chemical
Ex: h+o2 = h2o