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How would I find the concentration of a base used in titration given the following data:

Volume of acid in Erlenmeyer flask = 25.00 mL (HCl)

Molar concentration of acid in Erlenmeyer flask = 0.2127 M (HCl)

Initial buret reading = 50 mL

Final buret reading = 29.54

Volume of base used in titration = 20.46 m

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