17.7 I think
Blah blah blahhhvv
Answer:
See explanation and image attached
Explanation:
We know that some substituted benzene reacts faster than benzene towards electrophillic substitution. This is often due to the activation of the benzene ring towards electrophillic substitution by resonance.
-OCH3 directs an incoming electrophile (such as during bromination) to the ortho or para position. This is made possible by resonance (mesomeric) effect as shown in the image attached to this answer.
Image credit: pinterest
Answer:
it is already balanced bro
The circle at the very top is magma, when it cools and hardens it becomes igneous rock. Weathering and erosion leads to the circle which is sediment, which through compaction becomes sedimentary rock. And when heat and pressure is applied, it becomes metamorphic rock, which can melt to be magma
Answer:
<em>a. </em>The buffering range is between 2.74 and 4.74.
<em>b.</em> The ratio of the formate to the formic acid is 10.23.
Explanation:
<em>a.</em> For every buffer solution, the optimal effective range is pH = pKa ± 1. Outside this range, the buffer does not work properly.
For the formic acid, the pKa is 3.74, thus the optimal range is between 2.74 and 4.74.
<em>b. </em>The Henderson-Hasselbalch equation is a chemical expression used to calculate the pH of a buffer knowing the ratio of the acid to base, or to calculate the ratio knowing the pH. The expression is:
where [A^{-}] is the concentration of the conjugate base and [HA] is the concentration of the acid.
For a formic acid/potassium formate solution that has a pH of 4.75 and pka of 3.74: