1. Given an atom with the Mass number of 40 and 22 neutrons, how many protons there are in the nucleus of this atom? How about electrons? How many electrons on the last shell? How many electrons, if any, does it need to comply with the octet rule? 2. What is the pH of a pure WATER solution if the concentration of H+ in water is 10-7 ?

3. Let’s assume you add acid to a solution containing a buffer. What is the buffer going to do (release or bind protons)? Hint: think about the definition of an acid & a buffer.