What is the pH to 2 decimal places after 21 mL of 0.20 M HCl is added to 125 mL of buffer prepared by mixing 0.10 M NH3 and 0.10 M NH4?

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year