Concentration of base in terms of x is 0.1 - x.
The amount of solute that has dissolved in a specific amount of solvent or solution is measured as solution concentration. A concentrated solution is one that has a significant amount of dissolved solute in it. A diluted solution is one that has a little amount of dissolved solute in it.
A 0.10M buffer solution mean the sum of concentration of acid and base in the buffer is 0.1M
if A is acid nd B is its conjugate base
[A] + [B] = 0.1
[B] = 0.1 - [A]
if [A] or acid concentration is x, [B] or base concentration is
[B] = 0.1 - x
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