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During a titration, 10 mL of an acidic solution of an unknown concentration was placed in a 125 mL Erlenmeyer flask. To this was added 20 mL of deionized water and two drops of phenolphthalein indicator, making the total volume in the flask 30 mL. A subsequent titration revealed that the concentration of the unknown acid was 0.868 M. What was the concentration of the diluted acid om the Erlenmeyer flask?

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