only drop hella stolen i mean not stolen points for chemistry people i'll drop 30 this time make sure you all thank and favorite other peoples answers on this everyone gets benefits

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

Iknow the answer is a but i don't know why

Determine the wavelength of the light absorbed when an electron in a hydrogen atom makes a transition from an orbital in the n=3 level to an orbital in the n=7 level.