We're being asked to rank the solutions by pH from highest pH to lowest pH.
highest pH → most basic
lowest pH → most acidic
Sr(OH)2(aq) → Group 2A ion (Sr-) paired with OH- → strong base (but with 2 OH- per 1 unit) → higher pH than NaOH
Assuming equal concentrations, rank these solutions by pH from highest pH to lowest pH.
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