gen question

[tlcmqn]

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what is the ksp of an unknow metal phosphate, M3PO4, if a saturated aqueous solution of the pure salt has a phosphate concentration of 9.0x(10^-4) M?

Answer: 27(9x10^-4)^4

where did the 27 come from???

 

[pbure9]

I'm not sure where the M came from

but the 27 comes from the following

its 9E-4 M of PO4 ions, so say thats n

ksp = (M)^3 (PO4)

now M = 3n

so you get ksp = (3n)^3 x 👎, which is 27(9E-4)

hope this helps!

 

[tlcmqn]

great, thank you