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x mg of Mg ( OH )₂( molar mass =58) is required to be dissolved in 1.0 L of water to produce a pH of 10.0 at 298 K. The value of x is ________ mg. (Nearest integer) (Given : Mg ( OH )₂ is assumed to dissociate completely in H ₂ O )

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aligned & pH =10 & pOH =4 & [ OH ⁻ ]=10⁻⁴ aligned no. of moles of OH ⁻=10⁻⁴ no. of moles of Mg ( OH )₂= 10⁻⁴ 2 =5 10⁻⁵ mass of aligned Mg ( OH )₂ & =5 10⁻⁵ 58 10^3 mg & =2.9 aligned

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