answer the following questions.

Prelaboratory Assignment: pH: Measurement and Application. 1. Calculate [H+]and [OH]for solutions with the following pH values: a) 4.0 b) 8.52 c) 12.60 2. 30mL of a 0.4375MHCl solution are added to 35mL of 0.250NaOH solution. What is the final pH ? 3. A solution with a pH of 2.91 is prepared by dissolving 1g. of benzoic acid, HC7H5O2, a weak acid, in 350mL of water. What is Ka of benzoic acid? 4. A 300mL buffer is prepared in which [HCO3]=0.2M and [CO32]0.075M a) What is the pH of this buffer (KaHCO33=4.71011) ? b) What is the pH of the buffer if 0.0100 moles of HCl are added