An aqueous solution is 0.3 M in Al 3 + and 3 M in Mg 2 + .× Given ( K SP ) A l ( O H ) 3 = 3 × 1 0 − 34 ( K SP ) M g ( O H ) 2 = 3 × 1 0 − 12 M 3 Select the only correct options.

Question

An aqueous solution is 0.3 M in Al 3 + and 3 M in Mg 2 + .× Given ( K SP ​ ) A l ( O H ) 3 ​ ​ = 3 × 1 0 − 34 ( K SP ​ ) M g ( O H ) 2 ​ ​ = 3 × 1 0 − 12 M 3 Select the only correct options.

TestHub · Accepted Answer

For ppt of Al ( OH ) 3 ​ ; 3 × 1 0 − 34 = [ Al 3 + ] [ OH − ] 3 3 × 1 0 − 34 = 0.3 [ OH − ] 3 ​ [ OH − ] = 1 0 − 11 M ​ ​ pOH = 11 , pH = 3 For ppt of Mg ( OH ) 2 ​ ; 3 × 1 0 − 12 = 3 [ OH − ] 2 \displaylines ​ [ OH − ] = 1 0 − 6 M ​ pOH = 6 , pH = 8 ​ Mg ( OH ) 2 ​ will precipitate at minimum pH = 8

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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