Plug in numbers into equation Q=mc (change T) and solve.
so 300= (35)(0.217)(F-22)
Answer:
Explanation:
HA + H₂O ⇌ H₃O⁺ + A⁻
(a) Calculate pKₐ
(b) Calculate the pH
We can use the Henderson-Hasselbalch equation to get the pH.
![\begin{array}{rcl}\text{pH} & = & \text{pK}_{\text{a}} + \log \left(\dfrac{[\text{A}^{-}]}{\text{[HA]}}\right )\\\\& = &4.74 +\log \left(\dfrac{0.01}{0.01}\right )\\\\& = & 4.74 + \log1.0 \\& = & 4.74 +0.0\\& = &4.7 \\\end{array}\\\text{The pH is $\large \boxed{\textbf{4.7}}$}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Brcl%7D%5Ctext%7BpH%7D%20%26%20%3D%20%26%20%5Ctext%7BpK%7D_%7B%5Ctext%7Ba%7D%7D%20%2B%20%5Clog%20%5Cleft%28%5Cdfrac%7B%5B%5Ctext%7BA%7D%5E%7B-%7D%5D%7D%7B%5Ctext%7B%5BHA%5D%7D%7D%5Cright%20%29%5C%5C%5C%5C%26%20%3D%20%264.74%20%2B%5Clog%20%5Cleft%28%5Cdfrac%7B0.01%7D%7B0.01%7D%5Cright%20%29%5C%5C%5C%5C%26%20%3D%20%26%204.74%20%2B%20%5Clog1.0%20%5C%5C%26%20%3D%20%26%204.74%20%2B0.0%5C%5C%26%20%3D%20%264.7%20%5C%5C%5Cend%7Barray%7D%5C%5C%5Ctext%7BThe%20pH%20is%20%24%5Clarge%20%5Cboxed%7B%5Ctextbf%7B4.7%7D%7D%24%7D)
The correct answer is B. Van der waals forces is the weakest intermolecular force. It is a temporary force that happens when electrons of two adjacent atoms occupy positions that make atoms form dipoles which can be temporary dipoles or a stronger dipole-dipole forces.
So if you are trying to find the coffee with the highest concentration of sugar, the cup that has the highest concentration of sugar is the cup that Sarah made on Thursday.
Since there were sugar molecules remaining at the bottom of her coffee cup, that means that the coffee solution was completely saturated with sugar - no more sugar was able to dissolve in the coffee.
