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12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-