What Ionic Form(s) Is/are Most Prevalent at PH 7

question 7

Multiple Choice

What ionic form(s) is/are most prevalent at pH 7.0? The pK_a values of phosphoric acid are 2.1, 7.2, and 12.4.

• A) HPO₄−²
• B) H₂PO₄−
• C) HPO₄−² and PO₄−³
• D) H₂PO₄− and HPO₄−²
• E) All are correct

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Definitions:

Driveshaft Rpm

Driveshaft Rpm (Revolutions per Minute) measures the rotational speed of the driveshaft in a vehicle, indicating how many times the shaft completes a full rotation in one minute.

U-joint Working Angles

The angles at which a universal joint operates, crucial for the proper transfer of rotary motion in drivelines.

Longitudinal Torque Rod

A rod in the suspension system of a vehicle that helps to manage longitudinal forces, aiding in the control of wheel alignment and handling.

Working Angles

The angles formed by the axis of the input and output shafts in a drivetrain, affecting the efficiency and vibration of the system.