66. What is the pH of a solution prepared by dissolving 4.00 g of NaOH in enough water to produce 500.0 mL of solution?
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66. What is the pH of a solution prepared by dissolving 4.00 g of NaOH in enough water to produce 500.0 mL of solution?
70. Strontium-90 has a half-life of 28 years and is formed during nuclear explosions. If a water sample had an activity of 84 pCi in June of 2010, approximately what will be the activity in Ci at the same time in June of 2094? 71. Calculate the hydroxide ion concentration in a solution with pH = 6.35 72. Ethanol is produced industrially by reacting ethylene gas with water. The balanced equation for this reaction is: C2H4(9) + H200) - C,HOH(O If water is present in excess, how many grams of ethanol can be produced from 8.0 g of ethylene?