The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.
<h3>What is Ka?</h3>
Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:
Ka = [H⁺][A⁻] / [HA]
Chemical equation with ICE table for the acetylsalicylic acid will be shown as:
C₉H₈O₄(aq) + H₂O(l) ⇄ C₉H₇O₄(aq) + H₃O⁺(aq)
Initial: x 0 0
Change: -a +a +a
Equilibrium: x-a x+a x+a
So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:
Ka = [x+a][x+a] / [x-a]
Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:
Ka = (x+a)² / x
By knowing the all values of concentration we can calculate the value of Ka.
Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.
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Answer:
The conjugated base of ammonium ion 
is 
Explanation:
A conjugate base is obtained by addition of proton 
. In order to get the conjugate base of , we need to add a proton to ammonium ion. We will get after addition of proton to ammonium ion.
Hence, the conjugate base of is
In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
So your answer would be
C) Models help scientists visualize things they can’t see.
