4. If 14.7 g of calcium is placed in 11.5 g of water, what mass of hydrogen gas is produced?
__ Ca + __ H2O → __ Ca(OH)2 + __ H2
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Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

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