An experiment requires the addition of 0.075 mol gaseous NH3 to 1.0 L of 0.025 M Mg(NO3)2. Ammonium chloride, NH4Cl, is added prior to the addition of the NH3 to prevent precipitation of Mg(OH)2. Calculate the minimum number of grams of ammonium chloride that must be added. Ksp of Mg(OH)2 = 2.1 × 10–5.
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