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Compute the pH of a 0.10 M benzoic acid solution if The Ka for benzoic acid is 6.5 × 10-5. . 

How many grams of NaCN would you require to dissolve in enough water to make exactly 250 mL of solution with a pH = 10.00?

Determine the mass percentage concentration of a sodium hydroxide solution produced by mixing 50.0 mL of a 25 % (density=2.45g/mL) sodium hydroxide solution with 10.0mL of H2O?

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