Let H2A represent a diprotic acid and let A represent its corresponding dibasic ion. A 40.0 mL sample of 0.25 M A2- was titrated with 0.50 M HCI. Which of these molecules and ions, H2A, HA", A²", are equal in concentration at midpoint 1 (Select all that apply.)

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.