How many valence electrons are in the molecule acetic acid, CH3CO2H?

(a) A 50.0 mL solution is prepared to be 1.29 M acetylsalicylic acid. In the first step, 8.55 mL of NaOH is titrated into the solution until the pH is exactly 5.0. What is the concentration of the titrant (NaOH)? (b) In the second step, enough 5.85 M nitric acid is added to the solution after the titration in part (a) is complete until the pH is one unit lower than the pKa of acetylsalicylic acid. What volume (mL) of nitric acid was added?

You wish to determine the concentration of your sulfurous acid. You titrate 27 mL of your acid with 506 mL of 0.23 M aluminum hydroxide. What is the concentration of your sample of sulfurous acid?  (A) 0.6 M (B) 0.3 M  (C) 0.64 M (D) 0.28 M

A solution of Mg(NO3)2 is prepared in 425 mL of water by adding 32.0 g Mg(NO3)2. What us the concentration of nitrate ion (NO3-) in this solution? (a) 0.216 M (b) 0.432 M (c) 0.508 M (d) 1.02 M