Question

In an ionic solution, a current consists of Ca2+ ions (of charge +2e) and Cl− ions (of charge −e) traveling in opposite directions.

Part A If 5.09×1018 Cl− ions go from A to B every 0.500 min , while 3.17×1018 Ca2+ ions move from B to A, what is the current (in mA) through this solution? I = nothing mA Request Answer

Part B In which direction (from A to B or from B to A) is the current in part A going? Please Choose

Answer 1

Total charge moving from A to B, q1 = 5.09 x 10¹⁸ x 2 x 1.6 x10^-19 = 1.63 C

Total charge moving from B to A, q2 = 3.17 x 10¹⁸ x 1.6 x10^-19 = 0.51C

Time, t = 0.5 minute= 0.5 x 60 = 30 s

Part A:

Negative charge is flowing from B to A and it produces a current in the same sense as that due to flow of positive charge from A to B.

Total current, I = q1/t + q2/t = 1.63/30 + 0.51/30 = 0.071 A

Total current, I = 0.071 A        

Part B

The current in part A is flowing from A to B.