I know how to solve the problem but can anyone tell me from where is the number

Question

I know how to solve the problem but can anyone tell me from where is the number "5.80E-7" when calculating Kb???? cuz I have noooooooo idea :-/ :-/ :-/

The pH of an aqueous solution of 0.317 M triethanolamine (a weak base with the formula C6H15O3N) is 9.92 10.63). Feedback: Let x = number of moles of C6H15O3N per liter that hydrolyzes. From the balanced chemical equation: Set up the Kb expression, and solve for x: From the Ka, Kb table linked above Assume that x is small relative to 0.317. Then:

Explanation / Answer

it is the value of Kb ie KB = 5.80E-7

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