What is the Ksp expression for this dissolving reaction? Na3PO4(s) 3Na+(aq) + PO4-3(aq)

A.
Ksp= [Na+] [PO4]3
B.
Ksp= [Na+]3 [PO4]3
C.
Ksp= [Na+] [PO-4]3
D.
Ksp= [Na+]3 [PO4-3]
E.
Ksp= [Na+3] [PO4]3

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.