An unknown student takes 20.0 mL sample of an unknown weak acid solution with a an unknown concentration and titrates it with NaOH solution. At half-equivalence point the pH is 2.80.  It takes 15.0mL of NaOH to reach an equivalence point. What would be the concentration of the unknown acid sample ________ M if the pH at equivalence point is 7.90.

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Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.