What is the ph of a 2.55 m concentration of this solution

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Problem- The carboxylic acid, chloroacetic acid (ClCH2COOH), has a pKa of 2.87. What is the pH of a 2.55 M concentration of this solution?

ClCH2COOH (aq) + H2O (l) ------> H3O+ (aq) + ClCH2COO- (aq)

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